d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. Auto Mechanical Practices Test; ASE Test Guide; Auto Mechanic Flash Cards; 2023 Edition. Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. A power assist brake booster push rod that is to short will cause which of the following? 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. What could be the cause of the problem? A brake hose problem like this can take two forms. variable hours is outside the range 0 through 80. 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. 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. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. It will lead to increased tire wear. 4-wheel disc brakes on a vehicle are causing 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. A only The power booster uses engine vacuum to assist your leg when applying the brakes, and is nearly universal in modern cars. Replacing the front strut _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. 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. All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. A. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. C. Both technicians Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. 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. Seized wheel cylinder piston b. Seized caliper piston D. Noticeable brake pulsation. b. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? 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. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. c. Excessive brake pedal travel I replaced the brake pads again, both calipers and rotors. d. while driving the vehicle slowly. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. 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. 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. To further reduce the noise, do not machine the rotor more than needed. Should I drive my car? Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. The caliper piston needs to move back into its bore with no binding. Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. 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. Correct answer D-The leak must be repaired before the linings are replaced. Step 1: Access the drum brake adjustment star wheel. Electric Vehicle Research Paper Correct answer C-New brake rotors don't need to be refinished. Who is right? This also reduces braking power. 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. That bleeds out any vacuum. If it needs to be done, the fluid can be removed after the lines are capped. The ABS and TRACTION OFF indicator lights stay on while the engine is running. 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. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. Pulsation:This is the symptom of a brake rotor that has warped. D. Neither technician. Technician A believes that you must depress the quick take up valve. Correct answer A-Excessive brake pedal travel is a sign of low hydraulic fluid, air in the hydraulic system, and can be caused by some mechanical issues as well. b. Brake fluid reservoir. Question: What makes a car's disc brakes drag hard after a 15-minute drive? A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. d. Neither A nor B, The front wheel bearings are being adjusted. A only c. Pressure differential switch The other major way brakes act up is when they fail to disengage completely in one way or another. A only A. Correct answer B-If the amber light is on, it indicates that there is an ABS fault. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. D. Neither technician. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. Question: I had problems with my brakes grinding and pulling to the right when braking. Using the screwdriver, gently pry out the rubber grommet that protects this access cover. Answer A is correct. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. C. Both technicians What are possible causes? Question: What if your car is going through brake fluid fast and your brakes don't want to work? C. Both Technicians B. Second, it can act like a check valve. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The first thing you should do is check your brake fluidlook in your owner's manual to see how. Mechanical fading is when the drum gets too hot and expands away from the linings. Who is right? A only Most modern brakes have rotors; older ones have drums, especially in the rear. A better idea of where the master cylinder is located in relation to the brake pedal. Calculate the following quantities: The total initial kinetic energy of the system. Residual valves are used to maintain constant pressure on the brake system. Answer B, glazed . Technician B believes that the brakes can't be bled. Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. You can pump the brakes before application to help offset this problem, but you need to get it fixed. d. Neither A nor B. 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! Who is right? a. a. b. Arcing Technician B says the wheel's direction of rotation can be verified by looking at the wheel direction on the scan tool data list. The rear brake linings are soaked with axle grease but still have a lot of lining left on them. c. Both A and B Who is right? Eventually, a sticking brake caliper will wear down the brake pads. Technician A states that the parking brake is not fully released. What could be the issue? A routine inspection would include all of the following EXCEPT. a. Spalling d. Repair leak and replace brake linings. On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. Is this possible? "Scratcher" and "sensor" are types of disc brake pad __________ indicators. a. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. You also want to use OEM clips and anti-squeal shims. ASE identifies suspension both . Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. If you get no assist, you need a new check valve. a. 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. The only fix I recommend for a faulty master cylinder is to replace it with a new one. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. Brake pads are being replaced on a vehicle with four-wheel disc brakes. 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. 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. D. loosening the front wheel bleeder screws with the ignition switch on. Copper corrodes easily which makes it a poor option. Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. Technician A says a defective proportioning valve could be the cause. d. Neither A nor B. a. This can be repaired by resurfacing or shims. A drum or rotor that has deep scores in it will cause the brakes to grab. Al+ClX2AlClX3. 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. It can also be a vacuum hose leak to the booster, or it can be a booster that is defective. You should clean or replace the adjusters to eliminate the problem. 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. Technician B A hydroboost power brake vehicle with a hard pedal can be the result of a belt that is loose on the power steering pump, fluid levels are low, power hoses leak or there are valves with leaks or faults on the hydroboost unit. Replace the brake linings Overview: How To Use OBD-II Scanner to Check Engine Light Codes - What type of scanners are there. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. d. Neither A nor B. Soft Pedal- The brake pedal is easy to push but there is less braking. A bad master cylinder can introduce air into the lines, as can a failure at a caliper or wheel cylinder. 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. However, it can also be due to fluid loss or a low fluid level. B. Technician A says excessive rotor run out could be the cause. Turn the star-shaped adjuster a few times. If there is fluid, but it is below the full indication, that may indicate that the friction material on the pads or shoes,or the rotors or drums themselves, may be worn beyond effectiveness. c. Defective metering valve. They are not compensating for normal lining wear. Technician B says backing off the castle nut will cause the bearing to overheat. The steering wheel vibrates all the time and always veers to the left. B only c. VAV_\text{A}VA and ITI_\text{T}IT? Brakes, when applied must not disrupt steering geometry. What do you think the problem might be? . 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 lubrication will help prevent a possible squeaky noise as the shoes move across the plate. A only Answer: Is your abs light on? The caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. Fear of the unknown causes anxiety. The sliding and moving parts of the brake system require lubrication to prevent them from binding. This problem could be caused by a bad: All the other answers are improper ways of adjusting drum brakes. Brake adjustment To fix this problem you will need to replace the caliper. After a master cylinders replaced and the brake system is bled what must happen? The drum brake adjuster is located under an access cover in the back of the drum brake. c. Seized caliper piston on the other side You can verify the wheel speed sensor operation while comparing the four-wheel outputs to the data list. 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. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. The pictures below show the master cylinder under the brake pedal. a. Question: The brakes on my new O4 Ford Explorer are dragging. B only Manage Settings 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. 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. C. Both technicians Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . a. 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. The vehicle pulls to the side under heavy braking Continue scrolling to learn more about these common issues and their solutions. 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. 2320, what is the phase relationship between I changed the brake pads, but that didn't help much. A low brake pedal can also be due to a fluid leak or worn brake linings. B only The other situations wouldn't be caused by the lack of free play. To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. 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. B only Fluid will not run from the master cylinder while you remove it. A pull when braking may also have nothing to do with brakes. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. 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. 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. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. It's good to understand what the cause of your problem might be before a mechanic starts talking about the need to replace this or that.
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