D. Neither technician. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. The ABS light doesn't go off after the engine starts. Who is correct? 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. Answer: There are a few options to look at here. a. An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. This loss of stopping power occurs when heat reduces the friction needed between the drum and shoe linings. Technician B says air trapped in the hydraulic system could be the cause. _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. B only 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 only Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. 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. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. Is this a caliper or could it be a blockage in the brake hose? Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. b. VAV_\text{A}VA and I2I_2I2? Who is right? Who is correct? The vacuum booster can be checked by pumping the pedal a few times while the engine is off. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. Correct answer C-Both technicians are correct. Excessive tire pressure It will also have a fault code related to the loss of boost. The lens-maker's equation has three design parameters. 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). Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. This heat can be caused by a dragging brake unit. The brakes of large trucks are different. You may feel your Chevy jerk when you brake. As a result, the car may exhibit a dragging sensation, since the brakes at the affected wheel are applied (or partially applied) at all times. B only Step 2: Adjust the star wheel. A only Then, it needs to be backed off until the wheel begins to spin freely. I highly recommend having your car towed; this is a very dangerous situation, and the problem needs to be fixed before the car is driven. However, it can also be due to fluid loss or a low fluid level. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. Brake Chatter: Warped or improperly finished rotors will cause this noise. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. Brake fluid expands as brake fluid temperature rises from normal braking. 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. c. Both A and B a. 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. A. Technician B says backing off the castle nut will cause the bearing to overheat. 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. 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. The master cylinder, where it attaches to the brake pedal. It will need replacement or resurfacing. Technician A says the yaw rate and deceleration sensor should be recalibrated. B. loosening the bleeder screw on the accumulator with the ignition switch on 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. 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. A slight gap should be present between the pushrod and the master cylinder. 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. B only DOT 3 brake fluid should not boil until it gets above 400 degrees Fahrenheit, but old brake fluid that has absorbed water can boil at as little as 284 degrees, which is why it needs to be changed every other year. Continue scrolling to learn more about these common issues and their solutions. A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. Technician B believes it's caused by movement of the brake pad while breaking. b. Wash in hot, soapy water and dry. A spongy brake pedal may be caused by: If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. Correct answer A-Excessive brake pedal travel is a sign of low hydraulic fluid, air in the hydraulic system, and can be caused by some mechanical issues as well. c. Clean with approved cleaner and reuse d. Air in the hydraulic system. A only c. Both A and B The system reverts to regular brake operation without ABS. Replace them if you see that they have oil, fluid or grease on them. The vehicle pulls to the side under heavy braking Consider a system consisting of both objects A and B. The brake pedal is firm when applied. Question: What if your car is going through brake fluid fast and your brakes don't want to work? Technician A is working on a vehicle that was brought in with excessive brake pedal travel. 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! Who is correct? c. Both A and B Question: I had problems with my brakes grinding and pulling to the right when braking. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Replace the defective part. How to Replace Honda Brake Pads: Tips and Precautions. 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. If this is what is going on, you need to identify and replace the faulty part. Copper corrodes easily which makes it a poor option. c. Both A and B Pulsation results from something loose in the system or by an unparallel rotor. Brake fluid reservoir. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. This leads to excessive pedal travel. B only 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. The other situations wouldn't be caused by the lack of free play. D. Neither technician. When that happens, I release the brakes and apply them again super fast. You can verify the wheel speed sensor operation while comparing the four-wheel outputs to the data list. You could also have a ballooning brake hose when the brakes are applied. Technician B says that the star wheel assembly should be lubricated on the floating end. 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. Correct answer C-New brake rotors don't need to be refinished. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. c. Replacing a ball joint a. ABS Diagnostic Trouble Code set Brake drum machined beyond its limit Erratic brake pulling occurs on a vehicle when the brakes are applied. D. Neither technician. 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. 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. Check out the system to make sure that you do not have a caliper leak or an oil leak. C. Installation of a new brake rotor What is this type of bearing failure called? 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. All of the following items could cause this erratic pull EXCEPT: If this is your problem, then the fix is to resurface the rear drums or replace them. c. Pressure differential switch The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. a. B only Loose wheel bearing Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. What is the most likely reason? Technician A says the cause could be a leaking power brake booster diaphragm. Which is the correct way to service these brakes? A drum or rotor that has deep scores in it will cause the brakes to grab. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. b. Correct answer A-the biggest downside of drum brakes is their susceptibility to fading. Binding Pins B. Sticking piston C. Binding caliper D. Worn break pads . if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. Most modern brakes have rotors; older ones have drums, especially in the rear. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. Question: What causes a brake pedal to depress all the way to the floor in a car? Second, it can act like a check valve. Are they safe? 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. Technician B says the cause is a faulty residual pressure check valve admitting air. The other three answers can lead to a low brake pedal. The ABS and TRACTION OFF indicator lights stay on while the engine is running. Write the correct spelling for Middle layer of skin. How To Determine Cause of Brake Drag. 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. Who is right? b. c. Both A and B 2320, what is the phase relationship between "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Which of the following can cause brake pedal pulsation? If the drum is machined beyond its limit, the contact surface moves further from the shoes. 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. A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following? Technician B Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. This problem could be caused by a bad: Brake adjustment All of these would cause a low brake pedal, EXCEPT: Technician A says excessive brake pedal freeplay could be the cause. Why is this enzyme likely to include a side chain such as Ser in its active site? B only This valve basically allows the rear drums to apply first in the system. It's a vital component in your car; leave it to the pros. a. Turn the star-shaped adjuster a few times. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. A car that pulls to one side can be annoying and also dangerous. Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. One of the first components to engage goes by the name of the push rod. a. Brake pads are being replaced on a vehicle with four-wheel disc brakes. I replaced the brake pads again, both calipers and rotors. 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. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. It also expands when subjected to high pressures. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. Brake dragging is commonly caused by broken or weak springs on the drum brakes. You wouldnt pack your own parachute on your first jump, would you? Correct answer C-Both techs are correct. Who is correct? Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. d. Neither A nor B. b. Four-wheel alignment Then you want to back it off until the wheel starts to spin freely. The master cylinder seems to be okay. Poor stopping Who is correct? 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. A drum or rotor that has deep scores in it will cause the brakes to grab. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. variable hours is outside the range 0 through 80. 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? Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. Check out the system to make sure that you do not have a caliper leak or an oil leak. An often-misdiagnosed cause of pull is a collapsed brake hose. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. 100100100 The building pressure in the system results in brake drag and possible brake lockup. Brake rotors need to be refinished under all of these conditions EXCEPT: 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. Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. The only fix I recommend for a faulty master cylinder is to replace it with a new one. First, it can act like a restrictor in the line. 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. b. When another fluid, other than brake fluid, is added to the brake system, the two fluids mix and a detrimental act begins to occur in the system. If it needs to be done, the fluid can be removed after the lines are capped. 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. B only Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Correct answer D-The leak must be repaired before the linings are replaced. Overview: How To Use OBD-II Scanner to Check Engine Light Codes - What type of scanners are there. Although, if you have a fluid level sensor in the master cylinder reservoir, you may see this light come on when the fluids are low. 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. You will find the booster between the master cylinder and the firewall in your engine compartment. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. 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. Loose wheel bearing Brake failure is common if the fluid leaks out of the system. 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. c. Both A and B This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. The pictures below show the master cylinder under the brake pedal. Question: I have a 99 Honda Civic EX. Technician A says the master cylinder pushrod adjustment is incorrect. Replacing the front strut 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. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. It will not be caused by lateral runout, which would cause brake chattering or pulsing. Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. 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. A only A master cylinder may fail in two ways: internally or externally. Why is there a rear knocking noise from the drums when applying the brakes? This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. What could be the cause of the problem? It sounds to me like some components aren't moving freely and are getting stuck causing the pulling and noises. On a car with a drum/disc system, the front brakes lock up on light pedal application. A. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. Correct answer D-Both of these techs are wrong. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. What is the cause? Or it's possible your brake booster push rod is out of adjustment. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Eventually, a sticking brake caliper will wear down the brake pads. a. 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? It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. a. C. 200200200 Answer: The brake fluid temperature rising and pressure building in the brake system. 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). B only Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. \mathrm{m} / \mathrm{s}.pB,i=4,6,0kg.m/s. A. Residual check valve c. Excessive brake pedal travel b. Proportioning valve To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. That's why the power assist begins to function properly after the engine runs. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. This article takes a closer look at three common culprits. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. You can resurface the rotors if they are still thick enough. D. Low brake fluid. A. pumping the brake pedal 10 times with the ignition switch on 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. You have questions like: Will my brakes fail? All of these might lead to a low brake pedal, EXCEPT: B. Light trucks and vans were mandated to be equipped with center high mount stop lamps in: A regenerative braking system uses_____to slow the vehicle during braking. You don't need to do anything different. Replacing sealed wheel bearing b. Caliper piston seized They will need to be resurfaced. A. Technician A says a defective proportioning valve could be the cause. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Why is this? Technician B states that the brakes can continue to operate like non-ABS brakes. Answer A is correct. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. Question: My Chevrolet 2006 has some braking problems. Unusual brake pedal feel. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT: Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer, Chapter 15 Test 3 Psych Testing and Measure. 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. d. Neither A nor B. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. Is this possible? Slight scoring or heat spots a. Spalling Who is right? To further reduce the noise, do not machine the rotor more than needed. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? 4-wheel disc brakes on a vehicle are causing brake squeal. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. d. while driving the vehicle slowly. C. Both Technicians Cause: Rear Wheel lockup or squatting has many causes. Technician B b. c. Both A and B Technician B believes that the brakes can't be bled. B. Technician A says a parking brake not fully released could be the cause. All the other answers are improper ways of adjusting drum brakes. The plugged compensator port leads to dragging brakes instead. 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. Always replace components with genuine GM parts to avoid premature failure of brake system components.
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which of the following can cause brake system dragging