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. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. You will find the booster between the master cylinder and the firewall in your engine compartment. Tech A states that in the Traction Control System, the control unit can independently apply individual brake units even though the driver is not stepping down on the brake pedal. Brake dragging is commonly caused by broken or weak springs on the drum brakes. 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 ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Should I drive my car? a. ABS Diagnostic Trouble Code set d. A faulty power booster. Replace them if you see that they have oil, fluid or grease on them. 4-wheel disc brakes on a vehicle are causing brake squeal. Be sure to remove the pad shims from the caliper and check for any rust under the shims as rust can cause the pads to bind. 7. A only Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. a. Replace the defective part. a. VAV_\text{A}VA and I1I_1I1? This can be repaired by resurfacing or shims. Other times it is fine. One of the first symptoms of bad or failing drum brakes is unusual brake pedal feel. Question: My brakes squeak only when I back up. Then you should try the brakes. 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. Correct answer C-Both technicians are correct. After that, fixing it is often easy with the help of your Haynes manual. 1. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. Technician A says you torque the adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. You can buy an overhaul kit for calipers, but they are hard to find and your caliper may not be worth bringing back to life. d. Brake light is illuminated. The technician believes there is most likely an issue with the hydraulic system. Correct answer C-Both techs are correct. 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? 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. Unusual brake pedal feel. When I bled the lines, the driver side brake fluid wouldn't come down. This also reduces braking power. If the drum is machined beyond its limit, the contact surface moves further from the shoes. 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? Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. The steering wheel vibrates all the time and always veers to the left. Pulsation:This is the symptom of a brake rotor that has warped. B only Question: My car has power brakes and used to stop on a dime. Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. 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. B. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. 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. Who is right? Lubricate slide pins on disc brakes to prevent brake drag and binding. The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Binding Pins B. Sticking piston C. Binding caliper D. Worn break pads . d. Neither A nor B. d-Neither A or B Both A and B All of the following can cause brake system dragging, EXCEPT: a-stuck caliper piston b-misadjusted master cylinder pushrod length c-restricted brake line or hose d-internal master cylinder leak Internal master cylinder leak Which of the following frictional brake systems is used on vehicles today? A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. Technician A says the cause could be a leaking power brake booster diaphragm. c. Both A and B If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. Technician B believes that the brakes can't be bled. Question: I had problems with my brakes grinding and pulling to the right when braking. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. Brake failure is common if the fluid leaks out of the system. Why is this? a. Answer: Yes, brake pads can cause problems for brakes on a car. The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. The steering wheel vibrates all the time and always veers to the left. Technician A says the master cylinder pushrod adjustment is incorrect. The air cleaner also can't cause a brake fluid leak. The consent submitted will only be used for data processing originating from this website. A master cylinder may fail in two ways: internally or externally. 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. They are not compensating for normal lining wear. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. c. Both A and B Even when everything is working properly with your brakes, and nothing is worn out, they can suddenly start making disconcerting noises or develop a shudder under use. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. They can also cause you to use more fuel. B. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. Brakes, when applied must not disrupt steering geometry. One of the first components to engage goes by the name of the push rod. Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. A. pumping the brake pedal 10 times with the ignition switch on When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. Many times the cause of an accident will be due to a problem with the brakes. A restricted disc brake caliper hose might cause all of these EXCEPT: Soft Pedal- The brake pedal is easy to push but there is less braking. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? You could add shims, use a brake noise aerosol, or brake grease to the backs of the pads to dampen the noise. Correct answer B-Having a seized caliper piston leads to a high pedal. This article is accurate and true to the best of the authors knowledge. 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. Using the screwdriver, gently pry out the rubber grommet that protects this access cover. Brake dragging is commonly caused by broken or weak springs on the drum brakes. The way to prevent these issues is to avoid driving in deep puddles, or areas where salt is used on the roads, but if that isn't an option, be sure to clean the wheels and underside of the car often in winter. In case these terms are new to you, real quick, I'll tell you that to stop the car, the master cylinder sends out fluid through tubes under pressure to drive a pincher (a caliper) that presses a pad or shoe against a metal disc (rotor) or drum. a. Technician B says insufficient clearance between the pads and caliper slider could be the cause. I seem to remember a similar post where the cause was found to be the brake pedal not returning fully, but not noticed by the driver. A car that pulls to one side can be annoying and also dangerous. 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. 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. If you do either of these processes, and your brake pads are more than half worn, its worth it to just replace the pads at the same time for the peace of mind it will give you; pads wear out frequently (they are a consumable item) and you might as well deal with them while in the neighborhood. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. c. Both A and B B only d. Neither A nor B. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. C. Both Technicians a. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. What's up with that? While starting the engine with the brakes applied, the pedal does not go down slightly. Excessive tire pressure B. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Contact. D. Brake pedal pulsation. Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. A routine inspection would include all of the following EXCEPT. Brake adjustment The caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. Who is right? Is this possible? 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. Correct answer D-Both technicians are wrong. 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. It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. Brake drag often occurs when the fluid in your system overheats. A soft brake pedal is a MAJOR brake issue. For drum brakes, a 10 lb. B. The ABS warning light usually comes on when there is this type of problem. The first thing you should do is check your brake fluidlook in your owner's manual to see how. Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. The other choices do not affect this concern. The caliper piston needs to move back into its bore with no binding. See less 79 RC bought from original owner in 2006 Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. What can cause this? After a master cylinders replaced and the brake system is bled what must happen? 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. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. Second, it can act like a check valve. When that happens, I release the brakes and apply them again super fast. Answer: The grinding sound may be something caught between the backing plate and rotor. The other major way brakes act up is when they fail to disengage completely in one way or another. If your brakes squeak and you want to know why, maybe I can help! If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Correct answer B-If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. Question: My rear inner pads wear down faster than the outer ones. When you make the final adjustments to the drum brakes: Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. Question: Will a bad master cylinder cause the calipers to stick? Assume the brakes are not applied. A only The component in the Figure is involved what procedure? Answer: There are a few options to look at here. a. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. b. Connect a hose to the caliper bleeder screw and insert the other end of the hose into a suitable container, open the bleeder screw, then use a C-clamp or pliers to slowly bottom the piston in the caliper Technician A says that all 3 channel ABS systems use only 3 wheel speed sensors. If it is too worn, you must replace it. Technician B says backing off the castle nut will cause the bearing to overheat. Loose wheel bearing B. Are they safe? The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. 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. You don't need to do anything different. It can also be the result in worn disc brake pads. Brake problems can be daunting if you don't know what's causing them. ASE A4 Practice Test. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. Replacing sealed wheel bearing Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Technician A is wrong because the parking brake would only affect the red brake light. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. 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. A. A drum or rotor that has deep scores in it will cause the brakes to grab. c. Both A and B d. Neither A nor B, The front wheel bearings are being adjusted. Technician A states that the parking brake is not fully released. Seldom does this result in a car that won't move at all, but driving with the brakes dragging is unsafe and will result in even more damage in a short amount of time if not repaired. It's possible your ABS module is no good. d. Air in hydraulic system. Who is right? Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. 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.. C. Installation of a new brake rotor C. Both technicians The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. Mechanical fading is when the drum gets too hot and expands away from the linings. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. Technician B Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. A only b. Four-wheel alignment Continue with Recommended Cookies. Technician B states that the brakes can continue to operate like non-ABS brakes. In a brake system with disc front and drum rear, there is a valve in the system known as a metering valve or hold-off valve. b. Wash in hot, soapy water and dry. b. Then you want to back it off until the wheel starts to spin freely. In Fig. Technician B says the brakes on this vehicle cannot be bled. Question: What makes a car's disc brakes drag hard after a 15-minute drive? c. VAV_\text{A}VA and ITI_\text{T}IT? The ABS and TRACTION OFF indicator lights stay on while the engine is running. Correct answer D-The leak must be repaired before the linings are replaced. d. Steering gear problem. The ABS light doesn't go off after the engine starts. 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. Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. 2. Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. Brake pads are being replaced on a vehicle with four-wheel disc brakes. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. The master cylinder, where it attaches to the brake pedal. They will need to be resurfaced. Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Technician A 2023 The Arena Media Brands, LLC and respective content providers on this website. . 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. b. Tech B states that this function can also be carried out by the driver in manual mode. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. A only However, it can also be due to fluid loss or a low fluid level. The other three answers can lead to a low brake pedal. DOT 3 brake fluid should not boil until it gets above 400 degrees Fahrenheit, but old brake fluid that has absorbed water can boil at as little as 284 degrees, which is why it needs to be changed every other year. b. 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. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. Frozen caliper piston The only fix I recommend for a faulty master cylinder is to replace it with a new one. 8. Thus, there are many ways to design a lens that has a particular focal length in air. Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. a. D. 400400400. Who is correct? Why is there a rear knocking noise from the drums when applying the brakes? c. Leakage past the master cylinder cups Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. Which of the following would NOT cause a disc break to drag? 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. All of these would cause a low brake pedal, EXCEPT: d. Metering valve. Bad front tires, or broken belts in a front tire, could cause it. Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. Who is right? d. Neither A nor B. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. a. On ABS systems that have a high-pressure accumulator, this is depressurized by: C. Dragging brakes Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. a. 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. 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.
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