D. Neither technician. Technician A believes it's a defective proportioning valve issue. C. Installation of a new brake rotor A. When the brake pedal gets soft or sinks to the floor, it's generally due to a leak in the braking system, most commonly the master cylinder leaking internally or externally. That way, if there is a leak in one part of the system, it should only affect one front brake and one rear brake. The component in the Figure is involved what procedure? All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Most modern brakes have rotors; older ones have drums, especially in the rear. The drum brake adjuster is located under an access cover in the back of the drum brake. B. This problem could be caused by a bad: Brake system to be inoperative I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as overextended self-adjusters. Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. Frozen caliper piston 2. A faulty proportioning valve or master cylinder could also cause a pull to one side when braking; this is unusual but it does happen. After that, fixing it is often easy with the help of your Haynes manual. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. What do you think the problem might be? Vacuum Pressure Vacuum - or really lack of vacuum pressure - is the most common cause of a hard brake pedal, and therefore the first thing to look at when a hard pedal is present. Lubricate slide pins on disc brakes to prevent brake drag and binding. Who is right? Pulsation results from something loose in the system or by an unparallel rotor. A. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. a. D. loosening the front wheel bleeder screws with the ignition switch on. I changed the brake pads, but that didn't help much. Residual check valve d. Neither A nor B, The front wheel bearings are being adjusted. Technician B C. Brake adjustment There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. The two main types of disc brake calipers are: The disc brake caliper is attached to the, Sliding calipers have pistons that are positioned on, bleed air or vacuum from the power booster, Brake bleeder screws enable all of the following tasks to be performed EXCEPT. c. Both A and B You need a scan tool to read the code. Correct answer C-Both techs are correct. Situations such as heavy loads or long downhill grades where the brakes are used heavily can lead to overheating of the lining, drums, or brake fluid, resulting in a loss of braking called: Which brake is used for holding a vehicle in place when its stationary? Brake fade is when the brake fluid is contaminated, so it causes a soft brake pedal, air in the lines, leaking master cylinder, frozen or seized caliper pins or piston, worn out pads, and glazed rotors. Before we get into the specifics of brakes and their problems, you may want to look at some of the basic rules for troubleshooting in general, as written in the beginning of every Haynes manual: Troubleshooting 101. Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. a. Who is correct? The residual valve (often in the master cylinder or proportioning valve) keeps a small amount of pressure in the brake lines so the pedal doesn't have to travel so far until initial engagement; a failure here can be difficult to pinpoint. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. The star adjuster should be adjusted until there is a slight drag on the drum. Check your pads for any type of contamination. Question: I just had brakes and rotors done two months ago on my vehicle. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Failure of lateral runout or thickness variation checks "Scratcher" and "sensor" are types of disc brake pad __________ indicators. d. while driving the vehicle slowly. A pull when braking may also have nothing to do with brakes. The brakes on quick take up systems use the same bleeding procedure as those without this valve. If the slide pins are your problem, they need to be cleaned and lubricated or replaced. Find out what these noises mean and what might fix them. A only A only a. Technician B states that the brakes can continue to operate like non-ABS brakes. Replace the hydrobooster. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. d. Repair leak and replace brake linings. 505050 a-drum brakes c. Both A and B a. with the engine off Brake failure is common if the fluid leaks out of the system. Low or uneven tire pressure can cause a pull. D. Neither technician. Any pull caused by unevenly worn tires will be amplified when you step on the brakes. Brake Chatter: Warped or improperly finished rotors will cause this noise. You may feel your Chevy jerk when you brake. To reduce this, the mating surfaces need to be cleaned and lubricated. The building pressure in the system results in brake drag and possible brake lockup. The lens-maker's equation has three design parameters. Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. The other choices will not do this. a. We and our partners use cookies to Store and/or access information on a device. One of the first components to engage goes by the name of the push rod. Technician A says to check the TCS and ABS diagnostic trouble codes. To get a sense of the scale of the energy, if we were to use this energy to create electron-positron pairs, approximately how many pairs could we create? It will also have a fault code related to the loss of boost. Light trucks and vans were mandated to be equipped with center high mount stop lamps in: A regenerative braking system uses_____to slow the vehicle during braking. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? Replacing the front strut All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. B. Lubricate the pads where the brake shoes ride on the backing plate of drum brakes. The master cylinder, where it attaches to the brake pedal. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The ABS (antilock brake system) amber light does not go off after the engine is started. You can resurface the rotors if they are still thick enough. Question: My brakes squeak only when I back up. b. If your brakes squeak and you want to know why, maybe I can help! On some vehicles, disc brakes are equipped with a steel scratcher that: Brake pad wear indicators may be either mechanical or: Which tool is used to measure the useful life of brake linings? Technician A says excessive brake pedal freeplay could be the cause. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. d. Air in the hydraulic system. Brake pad friction materials may be manufactured from any of the following EXCEPT: makes a noise if the brake pads are due to be replaced. B. Question: Will a bad master cylinder cause the calipers to stick? The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. A. The pictures below show the master cylinder under the brake pedal. 1. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT: Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Chapter 15 Test 3 Psych Testing and Measure. A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following? However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. As in: hit the brakes, let go, brake pedal comes back up, master cylinder side piston doesnt came all the way back and keeps pressure on the master. B only If you get no assist, you need a new check valve. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. residual valve is used to hold pressure against the . I highly recommend having your car towed; this is a very dangerous situation, and the problem needs to be fixed before the car is driven. Excessive brake drag Is this possible? Step 1: Access the drum brake adjustment star wheel. c. Leakage past the master cylinder cups Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. To put this discussion about brake proportioning valves in context, there are actually three basic kinds of valves in play in a non-ABS system. Binding Pins B. Sticking piston C. Binding caliper D. Worn break pads . b. In Fig. Brake problems can be daunting if you don't know what's causing them. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. Unusual brake pedal feel. The system reverts to regular brake operation without ABS. A. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Excessive Brake Travel: If the brake linings are worn, the drum brakes are misadjusted or the brake lines have air in them, you will have this issue. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. tech B states that the brake-by-wire system uses the break pedal position and pedal application speed as indicators of what the drive wants to do. Brake fluid expands as brake fluid temperature rises from normal braking. a. This drag happens with drum brake systems as the springs wear or become rusty. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. Sometimes, though not very often, the brakes won't work, and it sounds like it's grinding for one or two seconds. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. Correct answer B-The short push rod length has to travel farther to make contact. This heat can be caused by a dragging brake unit. If you are trying to bring a project car back to life, but can't get it to roll, chances are this is the problem. What's more, I'll teach you to fix it in either case. A brake hose problem like this can take two forms. Most instances of a hard pedal come down to a failure in the power boost system, whether vacuum based or hydro-boost (used mostly on diesels, we won't be covering it here). tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. The wheel cylinder is attached to the ________. Brake Noises: What Causes Them and How to Fix Them. d. Neither A nor B, A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Who is right? b. The mechanic is now telling me I need all of those parts replace again. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. C. Both technicians A only That's why the power assist begins to function properly after the engine runs. Intermodal equipment providers must maintain or cause to be maintained, records for each unit of intermodal equipment they tender or intend to tender to a motor carrier. This is a very common brake issue on all makes and models: when youre driving at highway speeds and you apply your brakes, the steering wheel shakes. variable hours is outside the range 0 through 80. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. I recommend having this area of the brakes inspected first. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. c. Both A and B Chapter 45: Servicing Hydraulic Systems and P, Chapter 16 Activity: Reconstruction and Resis, Study for Chapter 11: Health and Wellness, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. b. Brake dust is best removed from brake components on the vehicle by using: If a retracting tool is not available, which of the following can be used to retract the pistons in a caliper with non-integrated parking brakes? b. Four-wheel alignment If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. b. Correct answer C-New brake rotors don't need to be refinished. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? They are not compensating for normal lining wear. They can also cause you to use . Search by Part Number(s), Keywords, or VIN, Chevy Brake Problems: Common Issues and How to Fix Them, How to Program Chevy Silverado Key Fob Remote, How to Reset Your Chevy or GMC Oil Change Light, How to Unlock Your Chevy or GMC Radio for Free, How to Update Chevy and GMC Navigation Units. Been there, done that! Technician A Anything that has rubber in the brake system, such as the brake hoses, calipers, wheel cylinders, reservoir cap, ABS unit, master cylinder, proportioning valves, etc.all become junk. Brake dust is best removed from brake components on the vehicle by using: If a retracting tool is not available, which of the following can be used to retract the pistons in a caliper with non-integrated parking brakes? Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? C. Dragging brakes C. Both technicians A vehicle with 4-wheel disc brakes has a brake squeal. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. However, it can also be due to fluid loss or a low fluid level. Can I drive my car? Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. Who is right? 4-wheel disc brakes on a vehicle are causing brake squeal. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. Question: I have a 99 Honda Civic EX. The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. C. pumping the brake pedal 25 times with the ignition switch off If you don't know what to look for, have a mechanic who knows what they are doing and are reputable to inspect the brakes. They will need to be resurfaced. Correct answer B-Having a seized caliper piston leads to a high pedal. If the drum is machined beyond its limit, the contact surface moves further from the shoes. initial cost With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. a. Question: A year and a half ago (from 78,000 to 88,000 miles), I had the whole brake system replaced, i.e., pad, rotor, and lines. If you have a soft or sinking brake pedal and are looking for information on what's causing it or what you should do next, you'll find the answers here. c. Both A and B C. Both technicians A only When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. To determine if your rear brakes are the problem, you need to test them in isolation. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Question: Only one wheel brakes on my 2000 Acura. B only Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. c. Parking brake out of adjustment Check out the system to make sure that you do not have a caliper leak or an oil leak. Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. Question: My car has power brakes and used to stop on a dime. Air and vaporized fluid are compressible and, if allowed into a hydraulic brake system, the brake pedal will feel spongy and the force transmitted to the lining will be reduced. B. Contact. Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled. I replaced master cylinder already. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. Technician A is wrong because the proportioning valve only affects brake lockup and is not used on 4-wheel disc brakes only on disc/drum combinations. The vehicle pulls to the side under heavy braking \mathrm{m} / \mathrm{s}.pB,i=4,6,0kg.m/s. d. Neither A nor B. Which technician is most likely correct? The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. Auto Mechanical Practices Test; ASE Test Guide; Auto Mechanic Flash Cards; 2023 Edition. Who is correct? 1) Caliper Slides The caliper has grooves which secure the brake pads in place and allow the pads to slide inward after you put your foot on the brake pedal. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. c. Replacing a ball joint Correct answer B-This is the standard process by many OEMS when a new rotor is installed. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. This valve basically allows the rear drums to apply first in the system. If it is too worn, you must replace it. This article is accurate and true to the best of the authors knowledge. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? The ABS and TRACTION OFF indicator lights stay on while the engine is running. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. Here are five of the most common brake problems in cars. What's up with that? If you work by process of elimination, starting with the most likely cause and working through to more complex issues, you can easily diagnose the problem yourself. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. Electric Vehicle Research Paper Who is right? Answer: No, you should really look for a new mechanic, pads maybe if you drive a ton of miles in stop and go traffic or you're a mail carrier, lines are rarely replaced. A better idea of where the master cylinder is located in relation to the brake pedal. Brake dragging is commonly caused by broken or weak springs on the drum brakes. 8. While these are the most common causes of brake issues on your Chevy, you should never allow your brakes to go bad. Who is right? If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. d. Neither A nor B. The other choices do not affect this concern. The other major way brakes act up is when they fail to disengage completely in one way or another. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. B. loosening the bleeder screw on the accumulator with the ignition switch on This can be repaired by resurfacing or shims. Brake drag often occurs when the fluid in your system overheats. A only Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} B. Question: My Chevrolet 2006 has some braking problems. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. It sounds to me like some components aren't moving freely and are getting stuck causing the pulling and noises. A only Brake dragging is commonly caused by broken or weak springs on the drum brakes. Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. A vehicle has a very erratic brake pulling concern while applying the brakes. Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. Abnormal noise. Question: My Chevrolet 2006 has some braking problems. If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. One safe way to test whether a braking problem is at the front or rear brakes is to drive at a low speed and: (7.1.2) *, All of the following can cause brake pedal pulsation, EXCEPT, All of the following can cause brake system dragging, EXCEPT. Who is correct? Technician A Technician B The master cylinder actually contains two pistons and seals, which in simpler systems controlled the front and back brakes separately, or the diagonally opposite wheels, so at worse you would only lose half your brakes. Check your brake hoses for anomalies. Brakes, when applied must not disrupt steering geometry. c. Defective metering valve. Brake fluid reservoir. Mechanical fading is when the drum gets too hot and expands away from the linings. Technician A says a parking brake not fully released could be the cause. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. The steering wheel vibrates all the time and always veers to the left. Correct answer D-A seized caliper piston could cause the pedal to be high with reduced braking power. Recently it takes longer to stop and I really have to put a lot of pressure on the brake pedal to come to a complete stop. Technician A says excessive rotor run out could be the cause. Copper corrodes easily which makes it a poor option. If your brake pedal feels squishy, "like stepping on a plum," and won't stop on the way down unless you pump it, or the brake pedal sinks to the floor with little or no resistance, you have a dangerous situation and should NOT drive any further! Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. It can also be a vacuum hose leak to the booster, or it can be a booster that is defective. Who is correct? If the dust boot that protects the piston from the elements gets torn, water and debris will penetrate the metal in the caliper and cause rust and corrosion. In a similar vein, a pinched hard brake line, or a rubber line that has started to come apart internally can cause the same problem, though localized to one or two wheels. Correct answer C-Both technicians are correct. A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. b. Arcing a. ABS Diagnostic Trouble Code set If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. You could also have a ballooning brake hose when the brakes are applied. It also expands when subjected to high pressures. A spongy brake pedal may be caused by: Which of the following would NOT cause a disc break to drag? . The sliding and moving parts of the brake system require lubrication to prevent them from binding. Calculate the following quantities: The total initial kinetic energy of the system. Step 2: Adjust the star wheel. It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. Who is right? Correct answer D-The metering valve controls the pressure to the front disc brakes on a combination system and if defective can allow too much pressure causing a lock-up. During brake application pressure is high enough to bypass the kink, but when the brake pedal is released, the spring pressure of the master cylinder is not sufficient for the pressure to bypass the kink. Some of the cause of brakes dragging on one or more wheels can be: A seized caliper or brake pads that have become jammed in the caliper is probably the most common failure of this type, and can occur due to age, rust, and salt used on winter roads. A. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. D. Neither Technician. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. b. Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. C. Both Technicians d. Neither A nor B. Glazed brake pads result from excessive heat. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. All the other answers are improper ways of adjusting drum brakes. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. 4-wheel disc brakes on a vehicle are causing brake squeal. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Correct answer D-Both technicians are wrong because the problem is in the power booster. Here is the list of possible causes: Service and parking brake adjustment Rear brake hardware Shoe lands or bosses GM clip in wheel cylinders Brake drum condition Brake shoe contamination Brake valving Friction material Continue with Recommended Cookies. Excessive Push Rod Length The brake system in your car contains numerous components, each of which plays a distinct role in braking. Loose wheel bearing If you have rear disc brakes, this procedure may not work because some makes and models have a separate emergency brake, which is connected not to the rear rotor and caliper, but to a special drum inside the rear rotors with a separate braking system. If it the booster, check valve, or vacuum hose is bad, it will likely also cause a vacuum leak and rough engine idle as well, but an engine with a bad valve or head gasket can also cause low vacuum which can effect the brake boost. Bleed the brake lines as recommended by Chevy to fix this. b. Seized wheel cylinder piston b. Caliper piston seized b. Proportioning valve Much like our earlier examination of clutch issues, there are two general failure modes for brakes: They aren't engaging well enough, or they aren't disengaging. Answer: Is your abs light on? In this article, I will explain the most common reason for a slipping automatic transmission and the most common reason for a slipping standard transmission. There are different causes for brake drag. A check valve that is faulty can also let vacuum bleed out. a. Question: What causes a brake pedal to depress all the way to the floor in a car? Technician A says the cause could be a leaking power brake booster diaphragm. This leads to excessive pedal travel. d. Fluting. As a rule of thumb, shaking caused by a problem in the front end of the car will be felt in the steering wheel, while shaking in the rear will seem to affect the whole car. Check and make sure there is free play at the top of the brake pedal after driving and braking for a while, if there is no free play, something is out of adjustment. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. Technician B says air trapped in the hydraulic system could be the cause. Technician A The other three answers can lead to a low brake pedal. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. What could be the issue? The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. While starting the engine with the brakes applied, the pedal does not go down slightly.
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