which of the following can cause brake system dragging

Technician A says excessive rotor run out could be the cause. b. Arcing Correct answer B-If the amber light is on, it indicates that there is an ABS fault. The lens-maker's equation has three design parameters. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. 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. This delay causes the spongy feel. c. Seized caliper piston on the other side Contact. 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. Technician A says the cause could be a leaking power brake booster diaphragm. Replacing the front strut It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. Soft Pedal- The brake pedal is easy to push but there is less braking. Step 1: Access the drum brake adjustment star wheel. eCFR :: 49 CFR Part 396 -- Inspection, Repair, and Maintenance b. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. Loose wheel bearing Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. This article is accurate and true to the best of the authors knowledge. Always use OEM recommended clips and anti-squeal shims. This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. A. Technician A is wrong because excessive rotor runout will cause brake pulsations with no effect on wear. An often-misdiagnosed cause of pull is a collapsed brake hose. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. They will need to be resurfaced. A soft brake pedal is a MAJOR brake issue. Lubricate the pads where the brake shoes ride on the backing plate of drum brakes. Here are five of the most common brake problems I run into, starting with the most serious. 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. C. Both technicians 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 B only A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. b. This also reduces braking power. 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? d. Repair leak and replace brake linings. Seized caliper piston b. Technician A says the yaw rate and deceleration sensor should be recalibrated. Technician A ASE identifies suspension both . d. Neither A nor B. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. Who is correct? Technician A Which is the correct way to service these brakes? Who is right? I recommend having this area of the brakes inspected first. The rear brake linings are soaked with axle grease but still have a lot of lining left on them. The master cylinder, where it attaches to the brake pedal. I seem to remember a similar post where the cause was found to be the brake pedal not returning fully, but not noticed by the driver. Fluid will not run from the master cylinder while you remove it. Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. You should clean or replace the adjusters to eliminate the problem. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Excessive Push Rod Length The brake system in your car contains numerous components, each of which plays a distinct role in braking. A slow descent of the brake pedal means that the pressure is leaking out of the master cylinder. d. Seized caliper piston. Chevy Brake Problems: Common Issues and How to Fix Them To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. 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. 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. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. b. Question: My brakes squeak only when I back up. Technician A 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. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Brake Chatter: Warped or improperly finished rotors will cause this noise. Technician B says insufficient clearance between the pads and caliper slider could be the cause. You may lose your brakes if you run out of travel before they are fully applied. 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. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. 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 are possible causes? Many times the cause of an accident will be due to a problem with the brakes. Brakes Flashcards | Quizlet You could add shims, use a brake noise aerosol, or brake grease to the backs of the pads to dampen the noise. Air in the hydraulic system Step 2: Adjust the star wheel. Symptoms of a Bad or Failing Brake Drum | YourMechanic Advice A only They are not compensating for normal lining wear. 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. Brake drum machined beyond its limit d. Metering valve. Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? B only After that, fixing it is often easy with the help of your Haynes manual. 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. When you make the final adjustments to the drum brakes: c. Both A and B I changed the brake pads, but that didn't help much. Who is correct? Correct answer A-Technician A is right because if the master cylinder pushrod is too short that will be a delay in application. ASE A5 Brakes Flashcards | Chegg.com There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. Which of these can lead to brake pedal fade? B only The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. Although, if you have a fluid level sensor in the master cylinder reservoir, you may see this light come on when the fluids are low. Correct answer C-Both technicians are correct. Technician A says the master cylinder pushrod adjustment is incorrect. a. measure the pad-to-caliper piston clearance. 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 only Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. B only The vacuum booster can be checked by pumping the pedal a few times while the engine is off. 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. The other three answers can lead to a low brake pedal. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? There are only about nine evil mechanics in the world, they just move around a lot! 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. Abnormal noise. Pulsation results from something loose in the system or by an unparallel rotor. First, it can act like a restrictor in the line. 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. Assume the brakes are not applied. The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Brake booster causing brake drag? | Dodge RamCharger Central A only How to Adjust Drum Brakes | YourMechanic Advice Question: My Chevrolet 2006 has some braking problems. A spongy brake pedal may be caused by: Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). 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. The component in the Figure is involved what procedure? If this is your problem, then the fix is to resurface the rear drums or replace them. B. The only fix I recommend for a faulty master cylinder is to replace it with a new one. C. Dragging brakes Here are five of the most common brake problems in cars. 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. D. Neither technician. This loss of stopping power occurs when heat reduces the friction needed between the drum and shoe linings. auto tech review 3 Flashcards | Quizlet c. Clean with approved cleaner and reuse The building pressure in the system results in brake drag and possible brake lockup. If you see the Brake Warning Light illuminated, it is probably a leak. Bad front tires, or broken belts in a front tire, could cause it. Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. Question: Will a bad master cylinder cause the calipers to stick? If the slide pins are your problem, they need to be cleaned and lubricated or replaced. B only Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. Then, it should be backed off until there's a drag on the wheel. 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. 7 Symptoms of a Brake Caliper Sticking (and Common Causes) While starting the engine with the brakes applied, the pedal does not go down slightly. a. A vehicle with 4-wheel disc brakes has a brake squeal. The pictures below show the master cylinder under the brake pedal. a. VAV_\text{A}VA and I1I_1I1? Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this 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. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. c. Defective metering valve. If it is too worn, you must replace it. A. 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. All of these might lead to a low brake pedal, EXCEPT: Lubricate slide pins on disc brakes to prevent brake drag and binding. The wheel cylinder is attached to the ________. 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). b. b. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. The dragging sound could be caused by the brake drum not fully releasing when the brake is released. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. I replaced the brake pads again, both calipers and rotors. Why is this enzyme likely to include a side chain such as Ser in its active site? Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. d. Neither A nor B. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. This article takes a closer look at three common culprits. You may feel your Chevy jerk when you brake. c. Parking brake out of adjustment Technician B 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 If your brakes squeak and you want to know why, maybe I can help! How to Replace Honda Brake Pads: Tips and Precautions. Which of the following would NOT cause a disc break to drag? D. Brake pedal pulsation. Brake dragging is commonly caused by broken or weak springs on the drum brakes. 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. The consent submitted will only be used for data processing originating from this website. A clogged fluid return hole in the master cylinder can cause all four wheels to drag, because the fluid sent to the wheels when you press the pedal can't return and let the pressure off. What is this type of bearing failure called? You can verify the wheel speed sensor operation while comparing the four-wheel outputs to the data list. Brake problems can be daunting if you don't know what's causing them. The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. Bleed the brake lines as recommended by Chevy to fix this. The star adjuster should be adjusted until there is a slight drag on the drum. The plugged compensator port leads to dragging brakes instead. b. 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? To determine if your rear brakes are the problem, you need to test them in isolation. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. 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. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Who is right? Technician B A. 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. Who is right? The other three answers wouldn't cause the same issues. 2. 1. A check valve that is faulty can also let vacuum bleed out. What can cause this? Question: My car won't start unless I press really hard on the brakes. A. pumping the brake pedal 10 times with the ignition switch on Technician B is wrong because backing off the castle nut will not cause the bearing to overheat. 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! Al+ClX2AlClX3. The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. The master cylinder seems to be okay. Find out what these noises mean and what might fix them. c. Pressure differential switch C. Both technicians They will need to be resurfaced. a. I recommend having all the brake lines, calipers, and the master cylinder checked for leaks. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. The caliper piston needs to move back into its bore with no binding. A only D. Neither technician. D. Neither technician. C. 200200200 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. d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. b. Caliper piston seized A pull when braking may also have nothing to do with brakes. Continue with Recommended Cookies. Overview: How To Use OBD-II Scanner to Check Engine Light Codes - What type of scanners are there. 8. A. 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 rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. c. Both A and B D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. Been there, done that! Who is correct? Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. If it needs to be done, the fluid can be removed after the lines are capped. Question: I have a 99 Honda Civic EX. 7. ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 I highly recommend having your car towed; this is a very dangerous situation, and the problem needs to be fixed before the car is driven. You also want to use OEM clips and anti-squeal shims. a. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. a. Correct answer D-The leak must be repaired before the linings are replaced. Technician B says that the star wheel assembly should be lubricated on the floating end. c. Both A and B My Car Sounds Like Something Is Dragging, But Nothing A only Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Technician B believes it's caused by movement of the brake pad while breaking. a. Technician A Who is right? Technician A is wrong because recalibration is not required for these sensors. c. Both A and B Brake fluid reservoir. Question: I just had brakes and rotors done two months ago on my vehicle. 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. 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. A only Correct answer C-An ABS with a high-pressure accumulator, you depressurize it by pumping the brake pedal 25 times while the ignition switch is off. which of the following can cause brake system dragging What could be the cause of the problem? It doesn't have power assist until the engine runs for a minute, then it begins to work normally. b. Wash in hot, soapy water and dry. brakes midterm Flashcards - Cram.com Electric Vehicle Research Paper 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. 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. 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. The building pressure in the system results in brake drag and possible brake lockup. What is the most likely reason? You need a scan tool to read the code.

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