d. Neither A nor B. a. 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. However, it can also be due to fluid loss or a low fluid level. 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. a. Technician B says insufficient clearance between the pads and caliper slider could be the cause. d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. That bleeds out any vacuum. D. Neither technician. Answer: There are a few options to look at here. All the other answers are improper ways of adjusting drum brakes. This article also includes a repair technique for noisy drum brakes that I found by trial and error. Brakes Dragging | The Causes of Brake Drag Explained However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. Now I have loud grinding sounds coming from the front left tire. Replacing the front strut There are different causes for brake drag. Correct answer C-Both techs are correct. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. b. Erratic brake pulling occurs on a vehicle when the brakes are applied. If your whole car shakes when your brakes are applied, it could be just your rear brakes. The residual valve (often in the master cylinder or proportioning valve) keeps a small amount of pressure in the brake lines so the pedal doesn't have to travel so far until initial engagement; a failure here can be difficult to pinpoint. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. b. c. Seized caliper piston on the other side Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. b. Then, it's easier to empty once it's out. 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. What's more, I'll teach you to fix it in either case. Can you help me understand where the problems are and what I should repair or replace? The brakes of large trucks are different. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. 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. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. Technician B says the cause is a faulty residual pressure check valve admitting air. Assume the brakes are not applied. auto tech review 3 Flashcards | Quizlet Who is right? B. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. Brake failure is common if the fluid leaks out of the system. Correct answer A-You torque an adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Who is right? They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. Situations such as heavy loads or long downhill grades where the brakes are used heavily can lead to overheating of the lining, drums, or brake fluid, resulting in a loss of braking called: Which brake is used for holding a vehicle in place when its stationary? 2320, what is the phase relationship between To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The other three answers can lead to a low brake pedal. Correct answer B-Having a seized caliper piston leads to a high pedal. Technician A states that the parking brake is not fully released. You shouldn't waste your valuable time trying to rebuild it. Who is right? Who is right? They can also cause you to use . Correct answer B-The short push rod length has to travel farther to make contact. Any noises coming from your car may result in you ignoring the indicators. For the compressor linkage, at the instant shown, the crank is rotating counterclockwise at 2000rpm2000 \mathrm{rpm}2000rpm and accelerating at 10,000rad/s210,000 \mathrm{rad} / \mathrm{s}^210,000rad/s2. All of the following items could cause this erratic pull EXCEPT: A only A drum or rotor that has deep scores in it will cause the brakes to grab. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. While these are the most common causes of brake issues on your Chevy, you should never allow your brakes to go bad.