The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. b. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. A drum or rotor that has deep scores in it will cause the brakes to grab. 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. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. A only Auto Test -sambooy Flashcards | Quizlet b. Four-wheel alignment Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. 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? A vehicle is equipped with a vacuum brake booster. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. What Causes Brake Drag and How to Reduce It - Autos.com 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. A. You can also verify it by looking at the direction on the scan tool data list. 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. 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. Why is this? Tech B states that this function can also be carried out by the driver in manual mode. A) Warped rotors B) anti-lock braking system operation C) Both A and B D) None of the above Both A and B Which of the following can cause brake system dragging? On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. 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. Correct answer D-Both technicians are wrong. d. Neither A nor B. Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. There are only about nine evil mechanics in the world, they just move around a lot! The system reverts to regular brake operation without ABS. A check valve that is faulty can also let vacuum bleed out. If your whole car shakes when your brakes are applied, it could be just your rear brakes. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. 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. a. A only This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. b. 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. It can also be the result in worn disc brake pads. 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. 1. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. Correct answer C-Both techs are correct. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. Technician B says the cause could be a stuck closed residual check valve in the hose from the intake manifold to the power brake booster. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. Is this a caliper or could it be a blockage in the brake hose? 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. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. B only a. The building pressure in the system results in brake drag and possible brake lockup. A. This also reduces braking power. However, it can also be due to fluid loss or a low fluid level. Technician A Which of these can lead to brake pedal fade? This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. Answer: Yes, brake pads can cause problems for brakes on a car. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Brake dragging is commonly caused by broken or weak springs on the drum brakes. Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. Then, it needs to be backed off until the wheel begins to spin freely. The fix for this brake problem is simple: resurfacing the rotors, if they are still thick enough (see section 3 above), or replacing them if they are not. 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. ASE identifies suspension both . Other times it is fine. Any noises coming from your car may result in you ignoring the indicators. We and our partners use cookies to Store and/or access information on a device. 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. You should put new pads on your Chevy and replace or repair the rotors. Question: My car has power brakes and used to stop on a dime. The caliper piston needs to move back into its bore with no binding. a. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. 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. Correct answer B-Having a seized caliper piston leads to a high pedal. Then, it should be backed off until there's a drag on the wheel. Troubleshooting: Common Brake Issues and Causes Troubleshooting A Hard Brake Pedal | Classic Car Restoration Club Now I have loud grinding sounds coming from the front left tire. A. Seized wheel cylinder piston If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. A vehicle with 4-wheel disc brakes has a brake squeal. b. Wash in hot, soapy water and dry. Seized caliper piston After that, fixing it is often easy with the help of your Haynes manual. 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. If it is too worn, you must replace it. Brake rotors need to be refinished under all of these conditions EXCEPT: Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. The first thing you should do is check your brake fluidlook in your owner's manual to see how. When that happens, I release the brakes and apply them again super fast. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? 3 Hydraulics-Related Sources of Brake Drag B only Hydro boost locking up breaks | Diesel Place Who is correct? What could be the issue? C. Both technicians Regardless, I recommend having a thorough brake inspection by an experienced mechanic. Here are the top causes of a brake caliper sticking. You can do this test if your emergency brake handle is near the center console and it is the style that you pull up with your hand. variable hours is outside the range 0 through 80. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. Pulsation results from something loose in the system or by an unparallel rotor. The brakes of large trucks are different. I replaced master cylinder already. If there is plenty of fluid in evidence, check if it is hot; repeated hard use, towing, descending a steep hill, or a dragging calipercan boil the fluid. d. Air in hydraulic system. 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. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. A. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. Another possibility is that the pistons got bent, during a brake job or a car accident, and can't move freely anymore, causing the caliper to bind and limiting the amount of pressure to the pads. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. B. B. Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. See less 79 RC bought from original owner in 2006 Correct answer D-Both of these techs are wrong. You can resurface the rotors if they are still thick enough. All of these would cause a low brake pedal, EXCEPT: Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. For drum brakes, a 10 lb. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. 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. A. Correct answer A-Technician A is right because if the master cylinder pushrod is too short that will be a delay in application. b. Brake problems can be daunting if you don't know what's causing them. To further reduce the noise, do not machine the rotor more than needed. Technician A says to check the TCS and ABS diagnostic trouble codes. 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. The air cleaner also can't cause a brake fluid leak. An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. 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). Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. It will also have a fault code related to the loss of boost. To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. When I bled the lines, the driver side brake fluid wouldn't come down. A routine inspection would include all of the following EXCEPT. b. Typically a seized caliper or pads will cause a burning smell, a pull to one side, and dragging at one wheel, but it is possible for it to stick without those, and effectively lessening your braking by nearly half (if it is a front wheel, which provide 75% of the braking). Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. I recommend having this area of the brakes inspected first. B. It will not be caused by lateral runout, which would cause brake chattering or pulsing. Residual check valve The steering wheel vibrates all the time and always veers to the left. Who is correct? 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? Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. 7. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. Which technician is most likely correct? Technician B believes there is an issue with the lateral runout of the rotor. 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. . Always use OEM recommended clips and anti-squeal shims. C. 200200200 Fluid will not run from the master cylinder while you remove it. While starting the engine with the brakes applied, the pedal does not go down slightly. c. Clean with approved cleaner and reuse Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. c. Both A and B This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. Flashcards - ASE BRAKES - FreezingBlue 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. Bad front tires, or broken belts in a front tire, could cause it. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. B only The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. b. This drag happens with drum brake systems as the springs wear or become rusty. 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. If you do, it could be a matter of minutes until you smash into something. D. Low brake fluid. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. 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. What is the most likely reason? 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

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