It also expands when subjected to high pressures. If the vehicle has low or uneven tire pressure, there might be a pull. The caliper piston needs to move back into its bore with no binding. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. They need to be replaced at once. The drum brake adjuster is located under an access cover in the back of the drum brake. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. c. Low brake fluid If this is what is going on, you need to identify and replace the faulty part. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. Correct answer C-Both techs are correct. The brakes of large trucks are different. Technician A states that the parking brake is not fully released. b. If you get no assist, you need a new check valve. c. Pressure differential switch Abnormal noise. A only B. It can also be the result in worn disc brake pads. Technician B believes there is an issue with the lateral runout of the rotor. Personal Injury Attorney With Truck Accidents They following are three of them. Replacing sealed wheel bearing Always use OEM recommended clips and anti-squeal shims. Who is correct? 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. What are possible causes? residual valve is used to hold pressure against the . Technician A The power booster uses engine vacuum to assist your leg when applying the brakes, and is nearly universal in modern cars. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. d. Brake light is illuminated. Correct answer D-Air causes a gap in the hydraulic fluid flow because the fluid has to compress the air before it can apply the piston. Other times it is fine. Second, it can act like a check valve. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. a. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. Erratic brake pulling occurs on a vehicle when the brakes are applied. a. with the engine off A faulty proportioning valve or master cylinder could also cause a pull to one side when braking; this is unusual but it does happen. a. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. 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. 3 Basic Kinds of Valves in a Non-ABS System. Correct answer D-The metering valve controls the pressure to the front disc brakes on a combination system and if defective can allow too much pressure causing a lock-up. c. Both A and B A routine inspection would include all of the following EXCEPT. The other situations wouldn't be caused by the lack of free play. There are only about nine evil mechanics in the world, they just move around a lot! Step 2: Adjust the star wheel. The master cylinder, where it attaches to the brake pedal. Technician A is wrong because recalibration is not required for these sensors. Technician B Question: I just had brakes and rotors done two months ago on my vehicle. A slight gap should be present between the pushrod and the master cylinder. 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? Here are five of the most common brake problems in cars. Brake fluid reservoir. 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. Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. 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. The brake pedal is firm when applied. Here are five of the most common brake problems I run into, starting with the most serious. B only What is the most likely reason? 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. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. Ok, im starting a new thread because the problem is not an alignment problem anymore. 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. The mechanic is now telling me I need all of those parts replace again. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. A. c. Both A and B If every time you apply your brakes, your brake pedal pulses up and down, the problem is usually caused by the rotors being warped or out of true. 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! Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. b. Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. Then, it's easier to empty once it's out. When the brake pedal gets soft or sinks to the floor, it's generally due to a leak in the braking system, most commonly the master cylinder leaking internally or externally. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. What can cause this? A car that pulls to one side can be annoying and also dangerous. Which of the following is the proper procedure? 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 The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. A soft brake pedal is a MAJOR brake issue. Correct answer A-the biggest downside of drum brakes is their susceptibility to fading. D. Brake pedal pulsation. Correct answer A-Technician A is right because if the master cylinder pushrod is too short that will be a delay in application. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. Who is correct? The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. What could be the cause of the problem? When that happens, I release the brakes and apply them again super fast. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. c. Replacing a ball joint What do you think it might be? The other choices do not affect this concern. Correct answer D-A restricted disc brake caliper hose won't cause pedal pulsation. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. 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. Loose wheel bearing Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. All the other answers could occur. They can also cause you to use . Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. d. Neither A nor B. If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. Why is there a rear knocking noise from the drums when applying the brakes? B only Who is correct? Technician B says air trapped in the hydraulic system could be the cause. 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? Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. You have questions like: Will my brakes fail? Check out the system to make sure that you do not have a caliper leak or an oil leak. Return Springs: Weak or broken return springs will result in brake drag. It sounds to me like some components aren't moving freely and are getting stuck causing the pulling and noises. Who is correct? b. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. d. Neither A nor B. Question: I had problems with my brakes grinding and pulling to the right when braking. Then, it needs to be backed off until the wheel begins to spin freely. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. B. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. C. Both technicians Correct answer B-If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. Answer: Either the brake pads need to be replaced, or you could try shaving off the leading rear edge of the brake pad at a 45-degree angle and see if that helps. Technician A b. D. Neither technician. You don't need to do anything different. You shouldn't waste your valuable time trying to rebuild it. On a car with a drum/disc system, the front brakes lock up on light pedal application. A vehicle is equipped with a vacuum brake booster. You notice brake fluid in the engine. The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. Vacuum Pressure Vacuum - or really lack of vacuum pressure - is the most common cause of a hard brake pedal, and therefore the first thing to look at when a hard pedal is present. Unusual brake pedal feel. Assume the brakes are not applied. b. VAV_\text{A}VA and I2I_2I2? 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. 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. 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). Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Technician A believes that you must depress the quick take up valve. You could also have a ballooning brake hose when the brakes are applied. c. Both A and B 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. d. Neither A nor B. b. with the engine running Anything that has rubber in the brake system, such as the brake hoses, calipers, wheel cylinders, reservoir cap, ABS unit, master cylinder, proportioning valves, etc.all become junk. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. B only This problem could be caused by a bad: An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. Question: What makes a car's disc brakes drag hard after a 15-minute drive? The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. 1. B. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. Answer A is correct. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? B. All of the following items could cause this erratic pull EXCEPT: c. Both A and B a. 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. Which of the following conditions can cause brake pedal fade? The air cleaner also can't cause a brake fluid leak. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Questions are welcome. Correct answer B-Having a seized caliper piston leads to a high pedal. B. loosening the bleeder screw on the accumulator with the ignition switch on B only You'll need to remove the caliper and inspect all moving parts to diagnose the problem. I've included some pictures and FAQs. The building pressure in the system results in brake drag and possible brake lockup. d. while driving the vehicle slowly. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Can you help me understand where the problems are and what I should repair or replace? C. Both technicians Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Tech B states that this function can also be carried out by the driver in manual mode. C. Brake adjustment Technician A says a defective proportioning valve could be the cause. 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. Question: My car has power brakes and used to stop on a dime. 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? If your brakes squeak and you want to know why, maybe I can help! c. Both A and B Replacing the front strut 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. 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. DOT 5 Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. This leads to excessive pedal travel. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Technician B states that the brakes can continue to operate like non-ABS brakes. 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. 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 the slide pins are your problem, they need to be cleaned and lubricated or replaced. Technician B believes that the brakes can't be bled. I replaced the brake pads again, both calipers and rotors. Lubricate slide pins on disc brakes to prevent brake drag and binding. _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. 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 this is your problem, then the fix is to resurface the rear drums or replace them. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? measure the pad-to-caliper piston clearance. Technician A believes it's a defective proportioning valve issue. 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. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. 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 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.. Technician B says the cause is a faulty residual pressure check valve admitting air. 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. Is it a caliper problem? A only Excessive tire pressure The vehicle pulls to the side under heavy braking D. 400400400. Been there, done that! A check valve that is faulty can also let vacuum bleed out. D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. They will need to be resurfaced. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. 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. Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? A. Seized wheel cylinder piston How to Replace Honda Brake Pads: Tips and Precautions. It's a vital component in your car; leave it to the pros. How To Determine Cause of Brake Drag. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. d. Metering valve. Question: What causes a brake pedal to depress all the way to the floor in a car? The sliding and moving parts of the brake system require lubrication to prevent them from binding. The ABS (antilock brake system) amber light does not go off after the engine is started. Brake drum machined beyond its limit Any noises coming from your car may result in you ignoring the indicators. ASE A4 Practice Test. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. They are not compensating for normal lining wear. Answer B, glazed . 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. Technician A c. Clean with approved cleaner and reuse Question: The brakes on my new O4 Ford Explorer are dragging. B. A. Next, hold your foot to the pedal while starting the engine. You can verify the wheel speed sensor operation while comparing the four-wheel outputs to the data list. c. Brinelling Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. 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. 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. 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. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. The other major way brakes act up is when they fail to disengage completely in one way or another. Consider a system consisting of both objects A and B. Technician A says the master cylinder pushrod adjustment is incorrect. Correct answer D-A seized caliper piston could cause the pedal to be high with reduced braking power. B. The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. Question: A year and a half ago (from 78,000 to 88,000 miles), I had the whole brake system replaced, i.e., pad, rotor, and lines. Technician A says excessive brake pedal freeplay could be the cause. 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. Who is right? The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. Check your brake hoses for anomalies. Which of these can lead to brake pedal fade? The ABS light doesn't go off after the engine starts. 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). Who is correct? 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. Question: My Chevrolet 2006 has some braking problems. The other three answers wouldn't cause the same issues. Question: My rear inner pads wear down faster than the outer ones. Replace the brake linings The brakes can fail if your hydraulic system or master cylinder is leaking. 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. If you do, it could be a matter of minutes until you smash into something. 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).
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