Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Eventually, a sticking brake caliper will wear down the brake pads. Excessive brake drag Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. The other complaints wouldn't occur as a result. You notice brake fluid in the engine. 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. A spongy brake pedal may be caused by: In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. A car that pulls to one side can be annoying and also dangerous. If the vehicle has low or uneven tire pressure, there might be a pull. Questions are welcome. Brake drum machined beyond its limit If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Soft Pedal- The brake pedal is easy to push but there is less braking. a. 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 Loose wheel bearing c. Replacing a ball joint Brake system to be inoperative Technician A says the quick take up valve must be depressed. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. d. Neither A nor B, The front brake rotors and pads are being replaced on a vehicle equipped with a TCS (traction control system) and electronic stability control system (ESC). Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled. 2023 The Arena Media Brands, LLC and respective content providers on this website. Tech B says that the faster a vehicle moving, the more braking power is needed. B only 1. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. See less 79 RC bought from original owner in 2006 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. Brake fluid expands as brake fluid temperature rises from normal braking. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. The system reverts to regular brake operation without ABS. Other times it is fine. a. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. Which of the following is the proper procedure? If you see the Brake Warning Light illuminated, it is probably a leak. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. 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. Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} 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. This leads to excessive pedal travel. If it needs to be done, the fluid can be removed after the lines are capped. A only If the coefficient of kinetic friction between the wheels and the pavement is k = 0.3, calculate the impulsive force on the wall if the brakes were applied during the crash.The brakes are applied to all four wheels so that all the wheels slip. Seized caliper piston Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. In Fig. 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. Replace the defective part. On a car with a drum/disc system, the front brakes lock up on light pedal application. D. Brake pedal pulsation. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Answer A is correct. All of these might lead to a low brake pedal, EXCEPT: If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. If the piston is stuck, and the fluid pressure can't push it back into the bore easily, the pressure on the pads will be uneven and the car will pull. What could be the issue? Many times the cause of an accident will be due to a problem with the brakes. 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. There are many possible causes of this shaking, including the front rotors being warped, hot spots (slight irregularities) on your rotors caused by excessive heat, or pad impressions. D. Neither technician. d. Air in hydraulic system. A. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. B only A only Write the correct spelling for Middle layer of skin. It will lead to increased tire wear. Answer B, glazed . Technician B 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. 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. B only b. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. Most braking systems work on a diagonal braking design for safety reasons; that is, the left front and right rear brakes work together and so do the right front and left rear. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. 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. You shouldn't waste your valuable time trying to rebuild it. Turn the star-shaped adjuster a few times. 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. b. a. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. 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. 2. The pictures below show the master cylinder under the brake pedal. Then, it needs to be backed off until the wheel begins to spin freely. Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. Brake pads are being replaced on a vehicle with four-wheel disc brakes. Technician A believes it's a defective proportioning valve issue. Replacing the front strut d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. Question: Does an emergency brake in a car not work after an accident? Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. You can resurface the rotors if they are still thick enough. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. To further reduce the noise, do not machine the rotor more than needed. Continue with Recommended Cookies. Then you want to back it off until the wheel starts to spin freely. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. What could be the cause of the problem? There are different causes for brake drag. If your rear drums are the cause of the brake pulsation, you will feel the pulsation at this time, and the car will shake when the emergency brake is applied. Manage Settings Who is correct? . They are not compensating for normal lining wear. a. A. The other three answers can lead to a low brake pedal. Correct answer D-Both technicians are wrong because the problem is in the power booster. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? B. The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. 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. Then, it should be backed off until there's a drag on the wheel. Technician A says the cause could be a leaking power brake booster diaphragm. Question: What causes a brake pedal to depress all the way to the floor in a car? On ABS vehicles, the ABS pump or the high-pressure accumulator can be the cause of power loss. The technician believes there is most likely an issue with the hydraulic system. 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? Question: I had problems with my brakes grinding and pulling to the right when braking. How to Replace Honda Brake Pads: Tips and Precautions. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. When the brakes are applied, brake fluid is pumped from the master cylinder to the calipers in order to expand the caliper piston and slow the vehicle. A soft brake pedal is a MAJOR brake issue. a. with the engine off 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 you are trying to bring a project car back to life, but can't get it to roll, chances are this is the problem. 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. 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. This valve basically allows the rear drums to apply first in the system. Correct answer B-Having a seized caliper piston leads to a high pedal. This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. Abnormal noise. Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. We and our partners use cookies to Store and/or access information on a device. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Who is correct? Here are five of the most common brake problems in cars. An example of data being processed may be a unique identifier stored in a cookie. A only b. measure the pad-to-caliper piston clearance. B only B. loosening the bleeder screw on the accumulator with the ignition switch on You also want to use OEM clips and anti-squeal shims. As rotors age, they go through the heating and cooling process thousands of times, so it's inevitable for them to lose their shape or trueness. 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. Replace the hydrobooster. 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. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. The building pressure in the system results in brake drag and possible brake lockup. Who is correct? 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. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. a. Al+ClX2AlClX3. All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. The other major way brakes act up is when they fail to disengage completely in one way or another. 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. Who is correct? I changed the brake pads, but that didn't help much. The other three answers can lead to a low brake pedal. B only What can cause this? This article is accurate and true to the best of the authors knowledge. Are they safe? This problem could be caused by a bad: 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. 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. Which is the correct way to service these brakes? Answer: It is most likely either a blockage in the line or a worn brake master cylinder. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. 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. C. Both Technicians It will also have a fault code related to the loss of boost. If your brakes squeak and you want to know why, maybe I can help! This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. Sinking Pedal: You may notice this while sitting at a stop light. Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). The three most common brake noises I encounter every day when talking to customers are a grinding sound, a thumping from the rear, and a squeak. 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. Then you should try the brakes. It can also be a vacuum hose leak to the booster, or it can be a booster that is defective. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. B only "Scratcher" and "sensor" are types of disc brake pad __________ indicators. I recommend having this area of the brakes inspected first. It's possible your ABS module is no good. It will need replacement or resurfacing. D. Low brake fluid. Beginner's Guide: What is ABS (and How Does It Work)? When I bled the lines, the driver side brake fluid wouldn't come down. You don't need to do anything different. Technician B Correct answer C-Both technicians are correct. c. Both A and B Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. 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. d. Neither A nor B. Hard Pedal: You may have a loss of power assist because the engine vacuum is low. To fix this problem you will need to replace the caliper. b. Answer: Is your abs light on? When you are in a crisis situation like a brake problem, some mechanics will take advantage of the customer and over-sell the work that really needs to be done. Bleed the brake lines as recommended by Chevy to fix this. a. Check your brake hoses for anomalies. a. A. c. Both A and B Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. A. For drum brakes, a 10 lb. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? A better idea of where the master cylinder is located in relation to the brake pedal. Who is right? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. 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. b. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. This can be due to oil, grease or fluid on a pad, a caliper that is stuck, brake line blockage, or wheel bearings that are loose. Which of the following conditions can cause brake pedal fade? Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. 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. 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. For the compressor linkage, at the instant shown, the crank is rotating counterclockwise at 2000rpm2000 \mathrm{rpm}2000rpm and accelerating at 10,000rad/s210,000 \mathrm{rad} / \mathrm{s}^210,000rad/s2. d. Neither A nor B. Correct answer B-The short push rod length has to travel farther to make contact. The other three answers wouldn't cause the same issues. Technician A states that the parking brake is not fully released. Troubleshooting can seem like a mysterious black art only practiced by experienced,professional mechanics, when you don't know how certain systems in your car work. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. Step 1: Access the drum brake adjustment star wheel. Technician B says backing off the castle nut will cause the bearing to overheat. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running.
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