Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. How to Adjust Drum Brakes | YourMechanic Advice Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Residual valves are used to maintain constant pressure on the brake system. You could try having a fine cut done to the brake shoe surface of the drums and lightly sand them after the cut, or replace the drums. residual valve is used to hold pressure against the . Checking the diagnostic trouble codes is possible. The star adjuster should be adjusted one full turn to back the shoes away from the drum. 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. The other choices will not do this. When you are in a crisis situation like a brake problem, some mechanics will take advantage of the customer and over-sell the work that really needs to be done. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. C. Both technicians d. Neither A nor B. c. Both A and B The plugged compensator port leads to dragging brakes instead. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. 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. Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. 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. Frank A5Brake Part A Hydraulic system - Chegg 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). Abnormal noise. c. Both A and B Al+ClX2AlClX3. Binding Pins B. Sticking piston C. Binding caliper D. Worn break pads . Check your pads for any type of contamination. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. 1) Caliper Slides The caliper has grooves which secure the brake pads in place and allow the pads to slide inward after you put your foot on the brake pedal. a. 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. d. Neither A nor B. 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. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. 3 Hydraulics-Related Sources of Brake Drag Be sure to remove the pad shims from the caliper and check for any rust under the shims as rust can cause the pads to bind. A. Another uncommon cause of a soft pedal and long travel, is a bad wheel bearing, which is unrelated to the brakes except for being in the vicinity of the rotors. Who is right? D. Brake pedal pulsation. ASE T-4 Brakes Flashcards - Cram.com Soft Pedal- The brake pedal is easy to push but there is less braking. The component in the Figure is involved what procedure? The ABS is what kicks the brake pedal back, so most likely it has something to do with the ABS system. 4-wheel disc brakes on a vehicle are causing brake squeal. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. c. Both A and B If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. d. Neither A nor B. 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. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. If you have rear disc brakes, this procedure may not work because some makes and models have a separate emergency brake, which is connected not to the rear rotor and caliper, but to a special drum inside the rear rotors with a separate braking system. If your brakes squeak and you want to know why, maybe I can help! Some of the cause of brakes dragging on one or more wheels can be: A seized caliper or brake pads that have become jammed in the caliper is probably the most common failure of this type, and can occur due to age, rust, and salt used on winter roads. if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. The master cylinder seems to be okay. Replacing the front strut Unusual brake pedal feel. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. Technician B 7. That bleeds out any vacuum. A pull when braking may also have nothing to do with brakes. Correct answer C-Both techs are correct. It's possible your ABS module is no good. variable hours is outside the range 0 through 80. If you do a lot of highway driving and you happen to be hard on your brakes, you will probably run into this problem many times in the life of your car. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. The wheel cylinder is attached to the ________. 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. a. Spalling B. b. If the slide pins are your problem, they need to be cleaned and lubricated or replaced. B only If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. 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. d. Seized caliper piston. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. The mechanic is now telling me I need all of those parts replace again. The dragging sound could be caused by the brake drum not fully releasing when the brake is released. 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 The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. Technician A says the master cylinder pushrod adjustment is incorrect. Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice b. What are possible causes? The rear brake linings are soaked with axle grease but still have a lot of lining left on them. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Brakes, when applied must not disrupt steering geometry. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. It also expands when subjected to high pressures. You could add shims, use a brake noise aerosol, or brake grease to the backs of the pads to dampen the noise. Continue with Recommended Cookies. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. Which of these can lead to brake pedal fade? Technician B says the cause is a faulty residual pressure check valve admitting air. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. 1. a. Technician B believes that the brakes can't be bled. . Question: My Chevrolet 2006 has some braking problems. Answer: There are quite a few possibilities for this problem. If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. The other brake pad is slightly worn. b. Question: What makes a car's disc brakes drag hard after a 15-minute drive? A vehicle is equipped with a vacuum brake booster. Here are the top causes of a brake caliper sticking. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. Answer: Yes, brake pads can cause problems for brakes on a car. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? To reduce this, the mating surfaces need to be cleaned and lubricated. Answer: It is most likely either a blockage in the line or a worn brake master cylinder. Questions are welcome. As rotors age, they go through the heating and cooling process thousands of times, so it's inevitable for them to lose their shape or trueness. a. On ABS systems that have a high-pressure accumulator, this is depressurized by: Pulsation:This is the symptom of a brake rotor that has warped. 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. 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. Bad Brake Caliper Symptoms: 7 Signs to Watch Out For 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! Lubricate slide pins on disc brakes to prevent brake drag and binding. A only Sketch each of your designs. _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. Ok, im starting a new thread because the problem is not an alignment problem anymore. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Technician A is wrong because the parking brake would only affect the red brake light. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. Most modern brakes have rotors; older ones have drums, especially in the rear. I've included some pictures and FAQs. Modern cars use a power assist (vacuum or otherwise) hydraulic system, with disc brakes on the front wheels, and discs or drums on the back. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. When I bled the lines, the driver side brake fluid wouldn't come down. The steering wheel vibrates all the time and always veers to the left. The brake pedal is firm when applied. Poor stopping The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. 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. 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. d. Brake light is illuminated. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. A soft brake pedal is a MAJOR brake issue. Check out the system to make sure that you do not have a caliper leak or an oil leak. Which technician is most likely correct? Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Technician B states that the brakes can continue to operate like non-ABS brakes. Which of the following is the proper procedure? Correct answer D-Both of these techs are wrong. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. What's up with that? Technician A says the yaw rate and deceleration sensor should be recalibrated. If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. Failure of lateral runout or thickness variation checks Who is right? This can be repaired by resurfacing or shims. Technician A believes it's a defective proportioning valve issue. Question: The brakes on my new O4 Ford Explorer are dragging. D. Neither technician. a. Excessive brake drag Brake failure is common if the fluid leaks out of the system. A low brake pedal can also be due to a fluid leak or worn brake linings. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. Question: My brakes squeak only when I back up. I replaced the brake pads again, both calipers and rotors. 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. You shouldn't waste your valuable time trying to rebuild it. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. c. Both A and B You should clean or replace the adjusters to eliminate the problem. A. It will lead to increased tire wear. Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. Brake problems can be daunting if you don't know what's causing them. This drag happens with drum brake systems as the springs wear or become rusty. A) Warped rotors B) anti-lock braking system operation C) Both A and B D) None of the above Both A and B Which of the following can cause brake system dragging? You could also have a ballooning brake hose when the brakes are applied. What is this type of bearing failure called? A. 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. 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. Technician B says insufficient clearance between the pads and caliper slider could be the cause. 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. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Assume the brakes are not applied. Who is correct? Troubleshooting: Common Brake Issues and Causes
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