Brake pads are being replaced on a vehicle with four-wheel disc brakes. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? It will need replacement or resurfacing. 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. 400400400. B. loosening the bleeder screw on the accumulator with the ignition switch on The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. a. On ABS systems that have a high-pressure accumulator, this is depressurized by: 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. d. Brake light is illuminated. d. Neither A nor B, The front wheel bearings are being adjusted. The other three answers wouldn't cause the same issues. 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. Correct answer D-The leak must be repaired before the linings are replaced. c. Both A and B a. Erratic brake pulling occurs on a vehicle when the brakes are applied. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. A slight gap should be present between the pushrod and the master cylinder. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. c. Both A and B 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. A. Correct answer C-Both techs are correct. A short power assist brake booster push rod will lead to which of these? A only 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 routine inspection would include all of the following EXCEPT. To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. Answer: The grinding sound may be something caught between the backing plate and rotor. Answer: There are a few options to look at here. Replace the defective part. 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. b. Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. 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. You notice brake fluid in the engine. Again, you will have to measure the drums to determine if they can be resurfaced or not. Who is correct? It also expands when subjected to high pressures. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. B. 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. d. Neither A nor B. if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. Sinking Pedal: You may notice this while sitting at a stop light. B only d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. The building pressure in the system results in brake drag and possible brake lockup. A vehicle is equipped with a vacuum brake booster. Question: My Chevrolet 2006 has some braking problems. Excessive tire pressure The other complaints wouldn't occur as a result. Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. The building pressure in the system results in brake drag and possible brake lockup. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. Correct answer B-Having a seized caliper piston leads to a high pedal. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Next, hold your foot to the pedal while starting the engine. Question: I had problems with my brakes grinding and pulling to the right when braking. Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. Why is there a rear knocking noise from the drums when applying the brakes? Who is correct? The ABS light doesn't go off after the engine starts. B only Second, it can act like a check valve. Technician B says air trapped in the hydraulic system could be the cause. Bad front tires, or broken belts in a front tire, could cause it. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. 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. Al+ClX2AlClX3. Typically rusted rotors or drums only happen when a car has been sitting for a long period. Question: My brakes squeak only when I back up. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. You may feel your Chevy jerk when you brake. A. If the coefficient of kinetic friction between the wheels and the pavement is k = 0.3, calculate the impulsive force on the wall if the brakes were applied during the crash.The brakes are applied to all four wheels so that all the wheels slip. Technician A 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. A better idea of where the master cylinder is located in relation to the brake pedal. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. d. Neither A nor B. b. Question: What makes a car's disc brakes drag hard after a 15-minute drive? 3 Basic Kinds of Valves in a Non-ABS System. Residual check valve A only All of these would cause a low brake pedal, EXCEPT: This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. You should clean or replace the adjusters to eliminate the problem. Technician A says the master cylinder pushrod adjustment is incorrect. This also reduces braking power. Check out the system to make sure that you do not have a caliper leak or an oil leak. If the vehicle has low or uneven tire pressure, there might be a pull. \mathrm{m} / \mathrm{s}.pB,i=4,6,0kg.m/s. d. Air in hydraulic system. A hydraulic system uses the incompressible nature of fluid to transfer force from your brake pedal all the way to your brake caliper, causing it to close around the rotor and slow the momentum of your wheel. 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. d. Metering valve. 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. 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. b. Caliper piston seized Brake pads are being replaced on a vehicle with four-wheel disc brakes. Replacing the front strut C. Both technicians Manage Settings b. d. Neither A nor B. C. 200200200 They will need to be resurfaced. b. You don't need to do anything different. For drum brakes, a 10 lb. Failure of lateral runout or thickness variation checks All the other answers could occur. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Answer: Is your abs light on? Is this a caliper or could it be a blockage in the brake hose? 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. a. with the engine off Ok, im starting a new thread because the problem is not an alignment problem anymore. A only B only Loose wheel bearing Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Why is this? You have questions like: Will my brakes fail? measure the pad-to-caliper piston clearance. When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. Technician A says the yaw rate and deceleration sensor should be recalibrated. Technician A Who is correct? d. Neither A nor B. 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. This drag happens with drum brake systems as the springs wear or become rusty. The first thing you should do is check your brake fluidlook in your owner's manual to see how. The mechanic is now telling me I need all of those parts replace again. Turn the star-shaped adjuster a few times. 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 C-The weak hydraulic brake hose causes a spongy pedal. 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. The system reverts to regular brake operation without ABS. Technician B says insufficient clearance between the pads and caliper slider could be the cause. The wheel cylinder is attached to the ________. 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? B. 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. 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. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. The steering wheel vibrates all the time and always veers to the left. Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. Technician A believes that you must depress the quick take up valve. Technician B says that the star wheel assembly should be lubricated on the floating end. D. Neither technician. Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. Check your brake hoses for anomalies. Glazed brake pads result from excessive heat. c. Leakage past the master cylinder cups Correct answer B-The short push rod length has to travel farther to make contact. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. c. Both A and B I recommend having a thorough brake inspection by removing all calipers and inspecting all moving parts of each caliper, if everything looks good, examine the hydraulic part of the system. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Correct answer A-the biggest downside of drum brakes is their susceptibility to fading. However, it can also be due to fluid loss or a low fluid level. Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. 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. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. Chapter 45: Servicing Hydraulic Systems and P, Chapter 16 Activity: Reconstruction and Resis, Study for Chapter 11: Health and Wellness, Introduction to Chemical Engineering Thermodynamics, Hendrick Van Ness, J.M. Question: The brakes on my new O4 Ford Explorer are dragging. 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. B. They need to be replaced at once. a. Question: I have a 99 Honda Civic EX. Be careful with brake fluid; it is very corrosive when it gets on paint. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. 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! The caliper piston needs to move back into its bore with no binding. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. b. b. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Copper corrodes easily which makes it a poor option. Question: My car has power brakes and used to stop on a dime. The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. Or it's possible your brake booster push rod is out of adjustment. B. Here are the top causes of a brake caliper sticking. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. Low or uneven tire pressure can cause a pull. 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. A. pumping the brake pedal 10 times with the ignition switch on Question: Will a bad master cylinder cause the calipers to stick? This brake pulsation can be fixed very easily by having your rotors resurfaced (which is cheaper) or replaced (more expensive). Answer A is correct. D. Neither technician. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. A power assist brake booster push rod that is to short will cause which of the following? Technician A 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 stuck brake caliper can cause the pads to be pressed against the rotor while driving. Question: My Chevrolet 2006 has some braking problems. b. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear.
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