This article is accurate and true to the best of the authors knowledge. To further reduce the noise, do not machine the rotor more than needed. Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. Who is correct? A vehicle with 4-wheel disc brakes has a brake squeal. Here are five of the most common brake problems I run into, starting with the most serious. c. Both A and B Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. A. Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. On a car with a drum/disc system, the front brakes lock up on light pedal application. Excessive Push Rod Length The brake system in your car contains numerous components, each of which plays a distinct role in braking. 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) * low brake fluid All of the following can cause brake pedal pulsation, EXCEPT internal master cylinder leak All of the following can cause brake system dragging, EXCEPT fixed and sliding Using the screwdriver, gently pry out the rubber grommet that protects this access cover. 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. 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. 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. Technician A says excessive rotor run out could be the cause. The vacuum booster can be checked by pumping the pedal a few times while the engine is off. 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. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Check your brake hoses for anomalies. If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. This leads to excessive pedal travel. The star adjuster should be adjusted until there is a slight drag on the drum. 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. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. A hydraulic system uses the incompressible nature of fluid to transfer force from your brake pedal all the way to your brake caliper, causing it to close around the rotor and slow the momentum of your wheel. Failure of lateral runout or thickness variation checks C. Both technicians Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. Technician A They can also cause you to use more fuel. Correct answer D-Both technicians are wrong. b. a. Then, it needs to be backed off until the wheel begins to spin freely. 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. You may lose your brakes if you run out of travel before they are fully applied. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. The mechanic is now telling me I need all of those parts replace again. Who is right? Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. 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. 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. You don't need to do anything different. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. 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. 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. The brakes can fail if your hydraulic system or master cylinder is leaking. Question: I just had brakes and rotors done two months ago on my vehicle. After the collision, object A is observed to have final momentum pA,f=13,3,0kgm/s.\vec{p}_{A, f}=\langle 13,3,0\rangle \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}.pA,f=13,3,0kgm/s. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. A spongy brake pedal may be caused by: Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. c. Both A and B 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. This article takes a closer look at three common culprits. The lens-maker's equation has three design parameters. Fluid will not run from the master cylinder while you remove it. 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. 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. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. The brakes on your car are probably the most important system, and due to the difficult job they do and how often they are used, they are also one of the most likely to wear and need service. d. Air in the hydraulic system. This brake pulsation can be fixed very easily by having your rotors resurfaced (which is cheaper) or replaced (more expensive). B. A car that pulls to one side can be annoying and also dangerous. 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. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. Calculate the following quantities: The total initial kinetic energy of the system. Who is right? A drum or rotor that has deep scores in it will cause the brakes to grab. Question: What if your car is going through brake fluid fast and your brakes don't want to work? 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 Chatter: Warped or improperly finished rotors will cause this noise. Question: Does an emergency brake in a car not work after an accident? 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. ASE A4 Practice Test. Brake problems can be daunting if you don't know what's causing them. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. Technician B says insufficient clearance between the pads and caliper slider could be the cause. The consent submitted will only be used for data processing originating from this website. The brakes on quick take up systems use the same bleeding procedure as those without this valve. Who is right? A brake hose problem like this can take two forms. If every time you apply your brakes, your brake pedal pulses up and down, the problem is usually caused by the rotors being warped or out of true. You also want to use OEM clips and anti-squeal shims. Correct answer D-A restricted disc brake caliper hose won't cause pedal pulsation. Slight scoring or heat spots d. Neither A nor B. It's possible your ABS module is no good. A restricted disc brake caliper hose might cause all of these EXCEPT: Always replace components with genuine GM parts to avoid premature failure of brake system components. The other complaints wouldn't occur as a result. B. A slow descent of the brake pedal means that the pressure is leaking out of the master cylinder. d. Neither A nor B. Who is correct? Al+ClX2AlClX3. c. Seized caliper piston on the other side There are only about nine evil mechanics in the world, they just move around a lot! A short power assist brake booster push rod will lead to which of these? Regardless, I recommend having a thorough brake inspection by an experienced mechanic. The ABS light doesn't go off after the engine starts. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. Bleed the brake lines as recommended by Chevy to fix this. 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. Beginner's Guide: What is ABS (and How Does It Work)? The other brake pad is slightly worn. Again, you will have to measure the drums to determine if they can be resurfaced or not. a. with the engine off Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. 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. Which of these can lead to brake pedal fade? That bleeds out any vacuum. As a result, the car may exhibit a dragging sensation, since the brakes at the affected wheel are applied (or partially applied) at all times. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? A only It will lead to increased tire wear. To determine if your rear brakes are the problem, you need to test them in isolation. b. One way to test your rear drum brakes is to apply the parking brake slightly while driving, because the parking brake uses the drum brakes in the rear. The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. 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. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Tech B says that the faster a vehicle moving, the more braking power is needed. c. Both A and B Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Technician B Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Then, it's easier to empty once it's out. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. C. pumping the brake pedal 25 times with the ignition switch off Question: My rear inner pads wear down faster than the outer ones. Which of the following conditions can cause brake pedal fade? What could be the issue? Technician B states that the brakes can continue to operate like non-ABS brakes. 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. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. Technician A C. Both technicians Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. A routine inspection would include all of the following EXCEPT. See less 79 RC bought from original owner in 2006 Residual check valve The first step when diagnosing a problem with caliper mountings, slides, and pins is to: The purpose of the lugs on the backing plate is to: On some pads, the depth of the groove is set so: Disc brake pads consist of friction material ________ or _________ onto a steel backing plate (disc brakes). 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. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. c. Leakage past the master cylinder cups A. I replaced master cylinder already. . Replace the defective part. A power assist brake booster push rod that is to short will cause which of the following? D. loosening the front wheel bleeder screws with the ignition switch on. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. B only Sinking Pedal: You may notice this while sitting at a stop light. Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? This also reduces braking power. Question: The brakes on my new O4 Ford Explorer are dragging. After a master cylinders replaced and the brake system is bled what must happen? Checking the diagnostic trouble codes is possible. Unusual brake pedal feel. 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. This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. For drum brakes, a 10 lb. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Lubricate the pads where the brake shoes ride on the backing plate of drum brakes. a. Answer: You have a rear knocking noise from the drums because your shoes are being pulled away from the backing plate and snapped back into place by the spring clips. Answer: There are a few options to look at here. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. Question: My car won't start unless I press really hard on the brakes. Correct answer C-Both techs are correct. Other times it is fine. Technician B If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. The other three answers can lead to a low brake pedal. d. Steering gear problem. Brakes, when applied must not disrupt steering geometry. Wearing your pads down to the metal baking plates will also result in a very "wooden" brake pedal as well, as there is not as much friction when it is metal on metal, and they have to clamp harder to slow you down; the horrible grinding noise is usually an indication before the hard pedal. Answer: The first thing you need to do is remove all four wheels and inspect all caliper slide pins, pistons, and brake pads and shoes. residual valve is used to hold pressure against the . Next, hold your foot to the pedal while starting the engine. If you do a lot of highway driving and you happen to be hard on your brakes, you will probably run into this problem many times in the life of your car. Brake adjustment It doesn't have power assist until the engine runs for a minute, then it begins to work normally. Sketch each of your designs. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. 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. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. If it needs to be done, the fluid can be removed after the lines are capped. Lubricate slide pins on disc brakes to prevent brake drag and binding. Who is right? A. This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. C. Installation of a new brake rotor Ok, im starting a new thread because the problem is not an alignment problem anymore. A only The same factors can cause cable operated parking brakes to jam up as well, requiring a replacement of the parking brake cable. The power booster uses engine vacuum to assist your leg when applying the brakes, and is nearly universal in modern cars. The caliper piston needs to move back into its bore with no binding. Should I drive my car? This drag happens with drum brake systems as the springs wear or become rusty. A worn or corroded master cylinder bore causes excess pedal effort resulting in dragging brakes.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'freeasestudyguides_com-medrectangle-4','ezslot_3',116,'0','0'])};__ez_fad_position('div-gpt-ad-freeasestudyguides_com-medrectangle-4-0'); Brake Lines and Hoses: There may be pressure trapped in the brake line or hose after the pedal has been released. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Which of the following is the proper procedure? b. Proportioning valve Another uncommon cause of a soft pedal and long travel, is a bad wheel bearing, which is unrelated to the brakes except for being in the vicinity of the rotors. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. c. Both A and B Answer B, glazed . It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. On ABS systems that have a high-pressure accumulator, this is depressurized by: Excessive tire pressure Correct answer A-the biggest downside of drum brakes is their susceptibility to fading. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. A. C. Both Technicians Push and hold the release button on the end of the emergency brake handle; this is so the emergency brake does not lock into place and can be released easily. a. Who is correct? Correct answer B-If the amber light is on, it indicates that there is an ABS fault. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. Which technician is most likely correct? It sounds to me like some components aren't moving freely and are getting stuck causing the pulling and noises. b. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. 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. The caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. Continue with Recommended Cookies. Technician A B only A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. Eventually, a sticking brake caliper will wear down the brake pads. We and our partners use cookies to Store and/or access information on a device. Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. B only b. b. Loose wheel bearing To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Brake hydraulics are a sealed system, so there should not be air in the lines, but if after service you have a sponge pedal that is the most likely cause. d. Neither A nor B. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. All of these might lead to a low brake pedal, EXCEPT: Technician A is wrong because recalibration is not required for these sensors. The air cleaner also can't cause a brake fluid leak. If your brakes squeak and you want to know why, maybe I can help! Consider a system consisting of both objects A and B. Who is right? They can also cause you to use . The master cylinder seems to be okay. a. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. Technician B We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? Cause: Rear Wheel lockup or squatting has many causes. b. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. A. c. Both A and B 4-wheel disc brakes on a vehicle are causing brake squeal. Fear of the unknown causes anxiety. Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. a. The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. Question: What makes a car's disc brakes drag hard after a 15-minute drive? Technician A is working on a vehicle that was brought in with excessive brake pedal travel. 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. What is the cause? B only B only Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. Who is right? Technician B believes that the brakes can't be bled. Step 1: Access the drum brake adjustment star wheel. Sometime a misadjusted brake light switch can cause this, a blockage in a line, a frozen caliper slide pin, or a caliper piston will not more freely are all likely causes. An often-misdiagnosed cause of pull is a collapsed brake hose. Here are five of the most common brake problems in cars. If this is your problem, then the fix is to resurface the rear drums or replace them. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. b. a. Answer: There are quite a few possibilities for this problem. Manage Settings Answer: Is your abs light on? C. Both technicians 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. 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. 8. The brake pedal is firm when applied. I replaced the brake pads again, both calipers and rotors. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. B. c. Clean with approved cleaner and reuse 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? Correct answer D-Both technicians are wrong because the problem is in the power booster. A vehicle is equipped with a vacuum brake booster. d. Air in hydraulic system. Contact. All of these would cause a low brake pedal, EXCEPT: C. Both technicians A only The wheel cylinder is attached to the ________. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. A slight gap should be present between the pushrod and the master cylinder. One of the first components to engage goes by the name of the push rod. In addition to the above, you might want to try using your left toe underneath the brake pedal to lift it upwards once under way, to make sure it's returning fully. Brake Noises: What Causes Them and How to Fix Them. 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. The pictures below show the master cylinder under the brake pedal. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Who is correct? The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. Correct answer D-The leak must be repaired before the linings are replaced. You could also have a ballooning brake hose when the brakes are applied. Then, it should be backed off until there's a drag on the wheel. A drum or rotor that has deep scores in it will cause the brakes to grab. This heat can be caused by a dragging brake unit. a. This also reduces braking power. Replacing the front strut The master cylinder, where it attaches to the brake pedal. 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? 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. ASE identifies suspension both . 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 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. I changed the brake pads, but that didn't help much. When you make the final adjustments to the 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? Object A has mass mA=7kgm_{A}=7 \mathrm{kg}mA=7kg and initial momentum pA,i=17,5,0kgm/s,\vec{p}_{A, i}=\langle 17,-5,0\rangle \mathrm{kg} \cdot \mathrm{m} / \mathrm{s},pA,i=17,5,0kgm/s, just before it strikes object B, which has mass mB=11kg.m_{B}=11 \mathrm{kg}.mB=11kg. I recommend having a thorough brake inspection by removing all calipers and inspecting all moving parts of each caliper, if everything looks good, examine the hydraulic part of the system. You may also need to have the drum or the rotors replaced or resurfaced because you waited too long to change the shoes and pads. Buying a new caliper may cost more but you will make up the cost with the time you save. d. while driving the vehicle slowly. The ABS and TRACTION OFF indicator lights stay on while the engine is running. Who is right? Correct answer A-You torque an adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Low or uneven tire pressure can cause a pull. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. I've included some pictures and FAQs. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire?
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