D. Brake pedal pulsation. 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. A only This article takes a closer look at three common culprits. Troubleshooting: Common Brake Issues and Causes Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. d. Neither A nor B, The front wheel bearings are being adjusted. 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? 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. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. d. Neither A nor B. A vehicle is equipped with a vacuum brake booster. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. Correct answer C-New brake rotors don't need to be refinished. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. What do you think the problem might be? D. Neither technician. Technician A says to check the TCS and ABS diagnostic trouble codes. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. Frozen caliper piston d. Neither A nor B. B only Check out the system to make sure that you do not have a caliper leak or an oil leak. Any pull caused by unevenly worn tires will be amplified when you step on the brakes. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. 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. B only A vehicle with 4-wheel disc brakes has a brake squeal. B only Replace the defective part. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. d. Metering valve. 4-wheel disc brakes on a vehicle are causing brake squeal. 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. Bad Brake Caliper Symptoms: 7 Signs to Watch Out For 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. Who is correct? The rear brake linings are soaked with axle grease but still have a lot of lining left on them. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. You can resurface the rotors if they are still thick enough. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Step 2: Adjust the star wheel. . My Car Sounds Like Something Is Dragging, But Nothing A. C. pumping the brake pedal 25 times with the ignition switch off Technician A is wrong because the parking brake would only affect the red brake light. d. Fluting. The brakes on quick take up systems use the same bleeding procedure as those without this valve. Rear Brake Drag or Lockup - Drum Brakes - Phoenix Systems 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. Answer: There are a few options to look at here. Fear of the unknown causes anxiety. To get a sense of the scale of the energy, if we were to use this energy to create electron-positron pairs, approximately how many pairs could we create? The star adjuster should be adjusted one full turn to back the shoes away from the drum. Questions are welcome. A. b. Caliper piston seized It's a vital component in your car; leave it to the pros. a. All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? c. Clean with approved cleaner and reuse If you do, it could be a matter of minutes until you smash into something. 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). A only A only First, it can act like a restrictor in the line. ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 Technician B says when this happens the brakes will operate like a normal non-ABS brake system. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Push and hold the release button on the end of the emergency brake handle; this is so the emergency brake does not lock into place and can be released easily. Brake pads are being replaced on a vehicle with four-wheel disc brakes. c. Both A and B Excessive tire pressure If you get no assist, you need a new check valve. Use the lens-maker's equation to design three different thin diverging lenses, each having a focal length of 27.0cm27.0 \mathrm{~cm}27.0cm and each made from glass that has an index of refraction of 1.601.601.60. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. 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 involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. 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. 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 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! Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. B only 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). Who is correct? The building pressure in the system results in brake drag and possible brake lockup. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. Answer: Is your abs light on? Answer: There are quite a few possibilities for this problem. Mechanical fading is when the drum gets too hot and expands away from the linings. Technician A says excessive rotor run out could be the cause. Replace the hydrobooster. Is it a caliper problem? The other brake pad is slightly worn. If the drum is machined beyond its limit, the contact surface moves further from the shoes. ASE PRETEST QUIZLET Flashcards | Quizlet b. A routine inspection would include all of the following EXCEPT. B. loosening the bleeder screw on the accumulator with the ignition switch on A only There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. A slow descent of the brake pedal means that the pressure is leaking out of the master cylinder. 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. Who is correct? 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. B only The component in the Figure is involved what procedure? Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. What could be the issue? d. A faulty power booster. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. While starting the engine with the brakes applied, the pedal does not go down slightly. A only d. Neither A nor B. There are four types of brake fade. If you see the Brake Warning Light illuminated, it is probably a leak. D. Neither technician. 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. a. Spalling B. Al+ClX2AlClX3. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. A routine inspection would include all of the following EXCEPT. Chevy Brake Problems: Common Issues and How to Fix Them Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. You don't need to do anything different. Answer: Yes, brake pads can cause problems for brakes on a car. Who is correct? Should I drive my car? The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. This also reduces braking power. d. Neither A nor B. For drum brakes, a 10 lb. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. Step 1: Access the drum brake adjustment star wheel. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. If your car sits for long periods without moving, moisture from rain or high humidity causes your rotors to rust, except for the patch of rotor surface where the pads rest. Answer: It is most likely either a blockage in the line or a worn brake master cylinder. 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. A) Internal master cylinder leak B) Warped rotors C) Both A and B D) None of the above None of the above Technician A believes it's a defective proportioning valve issue. Be careful with brake fluid; it is very corrosive when it gets on paint. In Fig. 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. Both technicians Technician A says the cause could be a leaking power brake booster diaphragm. 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. 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. 100100100 B only Correct answer C-Both techs are correct. It's possible your ABS module is no good. Why is there a rear knocking noise from the drums when applying the brakes? The other situations wouldn't be caused by the lack of free play. Who is correct? I changed the brake pads, but that didn't help much. Other times it is fine. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. 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. How To: Diagnose and Fix Brake Drag - mpbrakes.com 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. 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. 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. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. Replacing sealed wheel bearing A vehicle has a very erratic brake pulling concern while applying the brakes. This heat can be caused by a dragging brake unit. Which of these can lead to brake pedal fade? Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. Calculate the following quantities: The total initial kinetic energy of the system. 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. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . Who is right? Technician B says that the star wheel assembly should be lubricated on the floating end. An often-misdiagnosed cause of pull is a collapsed brake hose. B only After that, fixing it is often easy with the help of your Haynes manual. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Cause: Rear Wheel lockup or squatting has many causes. 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? Question: I had problems with my brakes grinding and pulling to the right when braking. The only fix I recommend for a faulty master cylinder is to replace it with a new one. Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. Here are five of the most common brake problems I run into, starting with the most serious. A car that pulls to one side can be annoying and also dangerous. What could be the cause of the problem? residual valve is used to hold pressure against the . Sinking Pedal: You may notice this while sitting at a stop light. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. Technician B Brakes Dragging | The Causes of Brake Drag Explained Question: My Chevrolet 2006 has some braking problems. 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. a. What's up with that? Answer: No, you should really look for a new mechanic, pads maybe if you drive a ton of miles in stop and go traffic or you're a mail carrier, lines are rarely replaced. c. Both A and B 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. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. B only When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. The master cylinder seems to be okay. See less 79 RC bought from original owner in 2006 Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. B. Turn the star-shaped adjuster a few times. Loose wheel bearing Second, it can act like a check valve. Unusual brake pedal feel. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. Question: The brakes on my new O4 Ford Explorer are dragging. 4-wheel disc brakes on a vehicle are causing brake squeal. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. b. c. Pressure differential switch Technician B believes it's caused by movement of the brake pad while breaking. Continue with Recommended Cookies. Next, hold your foot to the pedal while starting the engine. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. C. Dragging brakes The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. D. loosening the front wheel bleeder screws with the ignition switch on. d. Air in the hydraulic system. 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. 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. Technician A believes it's a defective proportioning valve issue. The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. 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. Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. C. Both technicians Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. Question: I have a 99 Honda Civic EX. Correct answer D-Both of these techs are wrong. Technician A Who is right? c. Defective metering valve. You may lose your brakes if you run out of travel before they are fully applied. Brakes Flashcards | Quizlet This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. ASE T-4 Brakes Flashcards - Cram.com Slight scoring or heat spots 1. Who is right? Answer: The brake fluid temperature rising and pressure building in the brake system. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Technician A states that the parking brake is not fully released. b. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. 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. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. What is this type of bearing failure called? The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. 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. Correct answer D-Both technicians are wrong. initial cost Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. Brake problems can be daunting if you don't know what's causing them. The ABS light doesn't go off after the engine starts. A brake hose problem like this can take two forms. The ABS warning light usually comes on when there is this type of problem. 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? Assume the brakes are not applied. Correct answer B-Having a seized caliper piston leads to a high pedal. c. Leakage past the master cylinder cups Brake fluid expands as brake fluid temperature rises from normal braking. Disc Brake System Flashcards | Quizlet If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. 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. Technician A Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? It will need replacement or resurfacing. Technician A believes that you must depress the quick take up valve. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. Been there, done that! After a master cylinders replaced and the brake system is bled what must happen? Technician B says the wheel's direction of rotation can be verified by looking at the wheel direction on the scan tool data list. B only If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. Question: Does an emergency brake in a car not work after an accident? If it needs to be done, the fluid can be removed after the lines are capped. B. 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. Find out what these noises mean and what might fix them. 7. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. What is the cause? Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. If the brake fluid reservoir is full and there are no signs of leaks, the problem is usually an internal problem that you cant identify just by looking at the master cylinder. a-drum brakes I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. c. Both A and B The other choices do not affect this concern. Pulsation results from something loose in the system or by an unparallel rotor. The sliding and moving parts of the brake system require lubrication to prevent them from binding. You wouldnt pack your own parachute on your first jump, would you? Manage Settings 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. A bad master cylinder can introduce air into the lines, as can a failure at a caliper or wheel cylinder. You can also verify it by looking at the direction on the scan tool data list. Auto Mechanical Practices Test; ASE Test Guide; Auto Mechanic Flash Cards; 2023 Edition. Technician B says that the star wheel assembly should be lubricated on the floating end. The air cleaner also can't cause a brake fluid leak. Sketch each of your designs. B. A soft brake pedal is a MAJOR brake issue. Technician B states that the brakes can continue to operate like non-ABS brakes. The ABS and TRACTION OFF indicator lights stay on while the engine is running. 2. The ABS (antilock brake system) amber light does not go off after the engine is started. 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 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. It will not be caused by lateral runout, which would cause brake chattering or pulsing.
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