How To Determine Cause of Brake Drag. c. Clean with approved cleaner and reuse If your whole car shakes when your brakes are applied, it could be just your rear brakes. Who is correct? It's a vital component in your car; leave it to the pros. d. Neither A nor B. A only 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. Neither technician. Find out what these noises mean and what might fix them. a. with the engine off See less 79 RC bought from original owner in 2006 Technician B states that the brakes can continue to operate like non-ABS brakes. D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Who is right? This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. The dragging sound could be caused by the brake drum not fully releasing when the brake is 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. Auto Test -sambooy Flashcards | Quizlet A. pumping the brake pedal 10 times with the ignition switch on All of these might lead to a low brake pedal, EXCEPT: Rear Brake Drag or Lockup - Drum Brakes - Phoenix Systems d. Neither A nor B. C. Both technicians Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . The rear brake linings are soaked with axle grease but still have a lot of lining left on them. D. loosening the front wheel bleeder screws with the ignition switch on. Who is right? Brake adjustment Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. Check out the system to make sure that you do not have a caliper leak or an oil leak. Brake pads are being replaced on a vehicle with four-wheel disc brakes. Who is right? Sinking Pedal: You may notice this while sitting at a stop light. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. Correct answer B-Insufficient clearance between the pads and caliper slider causes the slider not to move and only applies one brake pad causing only that pad to wear. 7. They will need to be resurfaced. Fear of the unknown causes anxiety. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. d. Fluting. Situations such as heavy loads or long downhill grades where the brakes are used heavily can lead to overheating of the lining, drums, or brake fluid, resulting in a loss of braking called: Which brake is used for holding a vehicle in place when its stationary? This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. Pulsation:This is the symptom of a brake rotor that has warped. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. auto tech review 3 Flashcards | Quizlet This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Why is this? 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. d. Neither A nor B. What can cause this? A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. C. Both technicians To further reduce the noise, do not machine the rotor more than needed. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. C. Both technicians Correct answer B-Having a seized caliper piston leads to a high pedal. B. b. Answer: The brake fluid temperature rising and pressure building in the brake system. A restricted disc brake caliper hose might cause all of these EXCEPT: Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. Here is the list of possible causes: Service and parking brake adjustment Rear brake hardware Shoe lands or bosses GM clip in wheel cylinders Brake drum condition Brake shoe contamination Brake valving Friction material Many times the cause of an accident will be due to a problem with the brakes. Eventually, a sticking brake caliper will wear down the brake pads. All modern cars come with sophisticated antilock braking systems (ABS) and brake based stability control, which complicates some aspects of troubleshooting and repair, but those systems will inform you when there is a problem and default to the old, simple system. How To: Diagnose and Fix Brake Drag - mpbrakes.com 4-wheel disc brakes on a vehicle are causing brake squeal. The other three answers wouldn't cause the same issues. The rotor needs to be measured at the thinnest point with a micrometer or vernier caliper to determine whether it can be resurfaced or not. c. Both A and B Question: My car has power brakes and used to stop on a dime. a. b. B only This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. Who is right? A only Poor stopping The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. b. Frank A5Brake Part A Hydraulic system - Chegg b. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. A. 1. Why is there a rear knocking noise from the drums when applying the brakes? This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. A. Replacing sealed wheel bearing C. Dragging brakes Assume the brakes are not applied. B. An example of data being processed may be a unique identifier stored in a cookie. The common cause of this is a broken or weak retracting spring on drum brakes, corroded or jammed caliper piston, corroded mounting pins or the bushings on a floating caliper, the drum brake self-adjusters are overextended or there is an emergency brake cable that is sticking or is frozen in place. 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. a. Chapter 43/44/45/46 Brakes Flashcards | Quizlet All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? Answer: There are quite a few possibilities for this problem. The ABS light doesn't go off after the engine starts. Question: The brakes on my new O4 Ford Explorer are dragging. b. b. This problem could be caused by a bad: 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. If you dont find your issue here, check out my article on brake noises, look through the comments at the end, or leave a comment yourself telling your story. 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. Troubleshooting: Common Brake Issues and Causes The other major way brakes act up is when they fail to disengage completely in one way or another. 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? _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. 1) Caliper Slides The caliper has grooves which secure the brake pads in place and allow the pads to slide inward after you put your foot on the brake pedal. Technician B Calculate the following quantities: The total initial kinetic energy of the system. a. Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. Brake drag often occurs when the fluid in your system overheats. Modern cars use a power assist (vacuum or otherwise) hydraulic system, with disc brakes on the front wheels, and discs or drums on the back. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. 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. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. Technician B says insufficient clearance between the pads and caliper slider could be the cause. It will lead to increased tire wear. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. Technician B c. Parking brake out of adjustment d. Neither A nor B, The front wheel bearings are being adjusted. Consider a system consisting of both objects A and B. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. 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). 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. Return Springs: Weak or broken return springs will result in brake drag. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. B only A vehicle has a very erratic brake pulling concern while applying the brakes. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? 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. If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. A routine inspection would include all of the following EXCEPT. This also reduces braking power. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 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. B only All the other answers are improper ways of adjusting drum brakes. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. 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? Technician B believes that the brakes can't be bled. Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. That bleeds out any vacuum. Correct answer D-Both of these techs are wrong. Technician A a. B only Now I have loud grinding sounds coming from the front left tire. Five Common Brake Problems in Cars - AxleAddict Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. The star adjuster should be adjusted until there is a slight drag on the drum. 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 A only A. This leads to excessive pedal travel. Is this a caliper or could it be a blockage in the brake hose? B only Technician A is wrong because the parking brake would only affect the red brake light. 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. Why is this enzyme likely to include a side chain such as Ser in its active site? B only I've included some pictures and FAQs. c. Pressure differential switch If this is your problem, then the fix is to resurface the rear drums or replace them. Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. A only d. Neither A nor B. ABS causing brakes to stick | TDIClub Forums 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. Tech B states that this function can also be carried out by the driver in manual mode. Question: My rear inner pads wear down faster than the outer ones. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. The system reverts to regular brake operation without ABS. 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. Brake Noises: What Causes Them and How to Fix Them. 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. Who is right? Replace the brake linings The air cleaner also can't cause a brake fluid leak. B only I recommend having this area of the brakes inspected first. B only A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following? If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. C. Both technicians Failure of lateral runout or thickness variation checks Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. Question: Does an emergency brake in a car not work after an accident? 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. b. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. 505050 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 lack of brake pedal free play on a vehicle might cause: Correct answer C-when there's no free play, the brakes can't disengage fully. d. Metering valve. If this is what is going on, you need to identify and replace the faulty part. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. The master cylinder seems to be okay. C. 200200200 After a master cylinders replaced and the brake system is bled what must happen? 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. Technician B says backing off the castle nut will cause the bearing to overheat. Can you help me understand where the problems are and what I should repair or replace? If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. If the brake drum is machined beyond its limit the contact surface is further from the brake shoes and they move outward to maintain contact with the drum, causing the brake pedal to drop toward the floor as additional brake fluid moves into the hydraulic system. A brake hose problem like this can take two forms. Question: I have a 99 Honda Civic EX. C. pumping the brake pedal 25 times with the ignition switch off Other times it is fine. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. 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. a. VAV_\text{A}VA and I1I_1I1? A only The building pressure in the system results in brake drag and possible brake lockup. Cause: Rear Wheel lockup or squatting has many causes. d. Neither A nor B. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. 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. b. A. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. C. Brake adjustment Continue with Recommended Cookies. You can also verify it by looking at the direction on the scan tool data list. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? During brake application pressure is high enough to bypass the kink, but when the brake pedal is released, the spring pressure of the master cylinder is not sufficient for the pressure to bypass the kink. Answer: Yes, brake pads can cause problems for brakes on a car. variable hours is outside the range 0 through 80. 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. A routine inspection would include all of the following EXCEPT. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Who is right? Correct answer D-The leak must be repaired before the linings are replaced. Any pull caused by unevenly worn tires will be amplified when you step on the brakes. c. Both A and B Write the correct spelling for Middle layer of skin. 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. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. A slow descent of the brake pedal means that the pressure is leaking out of the master cylinder. Answer A is correct. 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. Technician B says the wheel's direction of rotation can be verified by looking at the wheel direction on the scan tool data list. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. 8. The brakes can fail if your hydraulic system or master cylinder is leaking. On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. 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? If the drum is machined beyond its limit, the contact surface moves further from the shoes. Can I drive my car? Answer: It is most likely either a blockage in the line or a worn brake master cylinder. d. Steering gear problem. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? Who is correct? Here are the top causes of a brake caliper sticking. d. A faulty power booster. 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. Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. Technician B says the cause is a faulty residual pressure check valve admitting air. First, it can act like a restrictor in the line. Seized wheel cylinder piston 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. The building pressure in the system results in brake drag and possible brake lockup. 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. Typically rusted rotors or drums only happen when a car has been sitting for a long period. Note: I dont recommend pulling up on the emergency brake handle at high speeds, it can cause your rear brakes to lock up and send the vehicle into a spin causing death or serious injury! This drag happens with drum brake systems as the springs wear or become rusty. This also reduces braking power. 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. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. What is the cause? \mathrm{m} / \mathrm{s}.pB,i=4,6,0kg.m/s. a. Technician B says that the star wheel assembly should be lubricated on the floating end. c. Both A and B 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. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 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. When another fluid, other than brake fluid, is added to the brake system, the two fluids mix and a detrimental act begins to occur in the system. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. 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 caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. 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.
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