DOT 5 Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. a. A power assist brake booster push rod that is to short will cause which of the following? a. Spalling Which is the correct way to service these brakes? Technician B says air trapped in the hydraulic system could be the cause. A only If it needs to be done, the fluid can be removed after the lines are capped. A routine inspection would include all of the following EXCEPT. You don't need to do anything different. Correct answer D-The leak must be repaired before the linings are replaced. 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. A only A. 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. 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. A bad master cylinder can introduce air into the lines, as can a failure at a caliper or wheel cylinder. C. Installation of a new brake rotor It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. 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. 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).
Which of the following can cause brake system dragging? In a brake system with disc front and drum rear, there is a valve in the system known as a metering valve or hold-off valve. Checking the diagnostic trouble codes is possible. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. Which of the following can cause brake system dragging? Sometimes, though not very often, the brakes won't work, and it sounds like it's grinding for one or two seconds. C. Both technicians Technician A D. Neither technician. Technician B says insufficient clearance between the pads and caliper slider could be the cause. A) Internal master cylinder leak B) Warped rotors C) Both A and B D) None of the above None of the above
Brake Problems Caused By Fluid Contamination Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Technician B says the cause is a faulty residual pressure check valve admitting air. Correct answer C-Both techs are correct. Who is right? The ABS and TRACTION OFF indicator lights stay on while the engine is running. The sliding and moving parts of the brake system require lubrication to prevent them from binding. 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. So im getting drag on my front brakes, both sides, after i drive it about 15-20 miles i jack up the front end the the wheels are real tight to spin by hand and you can hear the pads screeching against the rotor. Answer: The brake fluid temperature rising and pressure building in the brake system. You can resurface the rotors if they are still thick enough. If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. Seized caliper piston A drum or rotor that has deep scores in it will cause the brakes to grab. Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Technician B believes there is an issue with the lateral runout of the rotor. D. Neither Technician. 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. Check your brake hoses for anomalies. Much like our earlier examination of clutch issues, there are two general failure modes for brakes: They aren't engaging well enough, or they aren't disengaging. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. Question: My Chevrolet 2006 has some braking problems. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. Technician A d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. 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. When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. 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.. Abnormal noise. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop.
What Causes Brake Drag and How to Reduce It - Autos.com Brakes Flashcards | Quizlet Question: What if your car is going through brake fluid fast and your brakes don't want to work? d. Brake light is illuminated. 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. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Answer: There are quite a few possibilities for this problem. Check your pads for any type of contamination. B only Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list.
Rear Brake Drag or Lockup - Drum Brakes - Phoenix Systems Check out the system to make sure that you do not have a caliper leak or an oil leak. A. Are they safe?
How To Determine Cause of Brake Drag - Ford Truck Enthusiasts Forums Be careful with brake fluid; it is very corrosive when it gets on paint. Brake adjustment A master cylinder may fail in two ways: internally or externally. Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. 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. When I bled the lines, the driver side brake fluid wouldn't come down. c. Leakage past the master cylinder cups Technician B says backing off the castle nut will cause the bearing to overheat. The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. D. Low brake fluid. Technician B states that the brakes can continue to operate like non-ABS brakes. Most modern brakes have rotors; older ones have drums, especially in the rear. b. Caliper piston seized Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. The air cleaner also can't cause a brake fluid leak. Question: My brakes squeak only when I back up. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. Who is right? 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. 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. On ABS vehicles, the ABS pump or the high-pressure accumulator can be the cause of power loss. b. b. The other brake pad is slightly worn. c. Brinelling Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. Who is correct? A car that pulls to one side can be annoying and also dangerous. This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. I recommend having all the brake lines, calipers, and the master cylinder checked for leaks. c. Defective metering valve. They can also cause you to use more fuel. d. Steering gear problem. For drum brakes, a 10 lb. B. This article takes a closer look at three common culprits. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. All the other answers could occur. 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. If a 40 kg person is accelerating at 10m/s^2, then the magnitude of the force acting on him or her is 400 N. Write a C++ statement that prints the message The number is not valid. if the A better idea of where the master cylinder is located in relation to the brake pedal.
3 Mechanical Causes of Brake Drag - Radial Tire Service My Car Sounds Like Something Is Dragging, But Nothing They will need to be resurfaced. a. In addition to the above, you might want to try using your left toe underneath the brake pedal to lift it upwards once under way, to make sure it's returning fully. Frozen caliper piston Beginner's Guide: What is ABS (and How Does It Work)? Technician B believes that the brakes can't be bled.
Five Common Brake Problems in Cars - AxleAddict tech B states that the brake-by-wire system uses the break pedal position and pedal application speed as indicators of what the drive wants to do. If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. Here are five of the most common brake problems in cars. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. 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. Brake pads are being replaced on a vehicle with four-wheel disc brakes. Overview: How To Use OBD-II Scanner to Check Engine Light Codes - What type of scanners are there. The mechanic is now telling me I need all of those parts replace again. Binding Pins B. Sticking piston C. Binding caliper D. Worn break pads . Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. We and our partners use cookies to Store and/or access information on a device. Correct answer C-Both technicians are correct. c. Both A and B If your rear drums are the cause of the brake pulsation, you will feel the pulsation at this time, and the car will shake when the emergency brake is applied. 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. Bleed the brake lines as recommended by Chevy to fix this. 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. ABS Diagnostic Trouble Code set 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. 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. What do you think the problem might be? The brake pedal is firm when applied. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. 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. It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. B. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Seized wheel cylinder piston B. Is this possible? This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Who is right? You need a scan tool to read the code. Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. 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. pumping the brake pedal 10 times with the ignition switch on There are only about nine evil mechanics in the world, they just move around a lot! The building pressure in the system results in brake drag and possible brake lockup. 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. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Electric Vehicle Research Paper On a car with a drum/disc system, the front brakes lock up on light pedal application. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? Technician B Again, you will have to measure the drums to determine if they can be resurfaced or not. A only 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. Loose wheel bearing Answer: There are a few options to look at here. Technician A is wrong because recalibration is not required for these sensors. Technician A Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. 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? B. c. Seized caliper piston on the other side A only A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. 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. Correct answer B-If the amber light is on, it indicates that there is an ABS fault.
Brakes Dragging | The Causes of Brake Drag Explained Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. 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. Air in the hydraulic system Answer B, glazed . 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. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. c. VAV_\text{A}VA and ITI_\text{T}IT? What can cause this? residual valve is used to hold pressure against the . c. with the vacuum hoses removed If your brakes squeak and you want to know why, maybe I can help! On ABS systems that have a high-pressure accumulator, this is depressurized by: There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels.
auto tech review 3 Flashcards | Quizlet Technician A believes that you must depress the quick take up valve. 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. Many times the cause of an accident will be due to a problem with the brakes. Who is correct? The drum brake adjuster is located under an access cover in the back of the drum brake. It will lead to increased tire wear. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. Correct answer D-A restricted disc brake caliper hose won't cause pedal pulsation. b. VAV_\text{A}VA and I2I_2I2? This leads to excessive pedal travel. b. Question: My rear inner pads wear down faster than the outer ones. Lubricate slide pins on disc brakes to prevent brake drag and binding. The brakes can fail if your hydraulic system or master cylinder is leaking. Why is this enzyme likely to include a side chain such as Ser in its active site? 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. Residual valves are used to maintain constant pressure on the brake system. A pull when braking may also have nothing to do with brakes. 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. c. Both A and B If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal.
Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice ASE T-4 Brakes Flashcards - Cram.com If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? How To Determine Cause of Brake Drag. C. Both technicians A only b. The caliper piston needs to move back into its bore with no binding. Sketch each of your designs. A. 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. Here are five of the most common brake problems I run into, starting with the most serious. It can also be the result in worn disc brake pads. Correct answer B-Having a seized caliper piston leads to a high pedal. The other choices do not affect this concern. Technician B Step 2: Adjust the star wheel. Return Springs: Weak or broken return springs will result in brake drag. 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. This heat can be caused by a dragging brake unit. 2320, what is the phase relationship between If the drum is machined beyond its limit, the contact surface moves further from the shoes. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? C. Brake adjustment 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. The system reverts to regular brake operation without ABS. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. Lubricate the pads where the brake shoes ride on the backing plate of drum brakes. B only d. Seized caliper piston. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. Who is right? I replaced master cylinder already. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. 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. Glazed brake pads result from excessive heat. d. Air in the hydraulic system. d. while driving the vehicle slowly. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down.
b. See less 79 RC bought from original owner in 2006 Who is correct? B. 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. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. There are many possible causes of this shaking, including the front rotors being warped, hot spots (slight irregularities) on your rotors caused by excessive heat, or pad impressions. If this is your problem, then the fix is to resurface the rear drums or replace them. To determine if your rear brakes are the problem, you need to test them in isolation.
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