Al+ClX2AlClX3. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. What's more, I'll teach you to fix it in either case. a. 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. Brake Chatter: Warped or improperly finished rotors will cause this noise. . You need a scan tool to read the code. 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. 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. 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. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. How to Adjust Drum Brakes | YourMechanic Advice Which of the following is the proper procedure? 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.. 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. Poor stopping HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. If this is what is going on, you need to identify and replace the faulty part. All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? Erratic brake pulling occurs on a vehicle when the brakes are applied. ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 Question: I had problems with my brakes grinding and pulling to the right when braking. If your brakes squeak and you want to know why, maybe I can help! Low or uneven tire pressure can cause a pull. Other times it is fine. Intermodal equipment providers must maintain or cause to be maintained, records for each unit of intermodal equipment they tender or intend to tender to a motor carrier. If you see the Brake Warning Light illuminated, it is probably a leak. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. You can buy an overhaul kit for calipers, but they are hard to find and your caliper may not be worth bringing back to life. The brake pedal is firm when applied. 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. A short power assist brake booster push rod will lead to which of these? ASE identifies suspension both . Technician A says the yaw rate and deceleration sensor should be recalibrated. 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. D. loosening the front wheel bleeder screws with the ignition switch on. brakes midterm Flashcards - Cram.com Answer: You have a rear knocking noise from the drums because your shoes are being pulled away from the backing plate and snapped back into place by the spring clips. eCFR :: 49 CFR Part 396 -- Inspection, Repair, and Maintenance Always use OEM recommended clips and anti-squeal shims. Here are the top causes of a brake caliper sticking. Technician B says air trapped in the hydraulic system could be the cause. Correct answer D-Air causes a gap in the hydraulic fluid flow because the fluid has to compress the air before it can apply the piston. Slight scoring or heat spots When that happens, I release the brakes and apply them again super fast. c. Leakage past the master cylinder cups Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? 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? D. Neither technician. What are possible causes? The rotor needs to be measured at the thinnest point with a micrometer or vernier caliper to determine whether it can be resurfaced or not. Soft Pedal- The brake pedal is easy to push but there is less braking. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. 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. Pulsation:This is the symptom of a brake rotor that has warped. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. The dragging sound could be caused by the brake drum not fully releasing when the brake is released. d. Air in hydraulic system. That way, if there is a leak in one part of the system, it should only affect one front brake and one rear brake. Who is correct? Fear of the unknown causes anxiety. 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. A brake hose problem like this can take two forms. C. Both technicians It does this through a small sliding valve operating on spring pressure. 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. Technician A says excessive rotor run out could be the cause. Buying a new caliper may cost more but you will make up the cost with the time you save. Technician B says backing off the castle nut will cause the bearing to overheat. How to Replace Honda Brake Pads: Tips and Precautions. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Sometime a misadjusted brake light switch can cause this, a blockage in a line, a frozen caliper slide pin, or a caliper piston will not more freely are all likely causes. I changed the brake pads, but that didn't help much. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. 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. 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. a. Technician B says that the star wheel assembly should be lubricated on the floating end. Troubleshooting: Common Brake Issues and Causes If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. C. Installation of a new brake rotor Replace the brake linings Answer: There are quite a few possibilities for this problem. Technician A 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. This can be due to oil, grease or fluid on a pad, a caliper that is stuck, brake line blockage, or wheel bearings that are loose. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. The system reverts to regular brake operation without ABS. b. Who is correct? b. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. What is the most likely reason? 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. C. Both technicians 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. Answer: Is your abs light on? Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. b. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. a. ABS Diagnostic Trouble Code set All of these might lead to a low brake pedal, EXCEPT: Contact. In a similar vein, a pinched hard brake line, or a rubber line that has started to come apart internally can cause the same problem, though localized to one or two wheels. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. If your whole car shakes when your brakes are applied, it could be just your rear brakes. If this is your problem, then the fix is to resurface the rear drums or replace them. To fix this problem you will need to replace the caliper. Correct answer C-Both techs are correct. On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. If you don't know what to look for, have a mechanic who knows what they are doing and are reputable to inspect the brakes. 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. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. 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? The ABS is what kicks the brake pedal back, so most likely it has something to do with the ABS system. Loose wheel bearing The brakes on quick take up systems use the same bleeding procedure as those without this valve. Who is right? How To Determine Cause of Brake Drag - Ford Truck Enthusiasts Forums It also expands when subjected to high pressures. You shouldn't waste your valuable time trying to rebuild it. You may feel your Chevy jerk when you brake. Then you should try the brakes. . a. Then, it needs to be backed off until the wheel begins to spin freely. Correct answer D-Both of these techs are wrong. Which of the following would NOT cause a disc break to drag? If the dust boot that protects the piston from the elements gets torn, water and debris will penetrate the metal in the caliper and cause rust and corrosion. B. Tech B states that this function can also be carried out by the driver in manual mode. What's up with that? Can you help me understand where the problems are and what I should repair or replace? Technician A states that the parking brake is not fully released. Technician B Any pull caused by unevenly worn tires will be amplified when you step on the brakes. 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. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. c. Excessive brake pedal travel Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. If there is fluid, but it is below the full indication, that may indicate that the friction material on the pads or shoes,or the rotors or drums themselves, may be worn beyond effectiveness. a-drum brakes Technician A is wrong because the parking brake would only affect the red brake light. The ABS light doesn't go off after the engine starts. A check valve that is faulty can also let vacuum bleed out. There are only about nine evil mechanics in the world, they just move around a lot! Continue with Recommended Cookies. a. B. loosening the bleeder screw on the accumulator with the ignition switch on The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. 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. If the vehicle has low or uneven tire pressure, there might be a pull. C. The star adjuster should be adjusted until a slight drag on the wheel occurs. Who is right? Brakes Dragging | The Causes of Brake Drag Explained If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? D. Noticeable brake pulsation. The other brake pad is slightly worn. A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. We and our partners use cookies to Store and/or access information on a device. Write the correct spelling for Middle layer of skin. What do you think the problem might be? C. Both technicians B. a. 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. B. d. Steering gear problem. When you make the final adjustments to the drum brakes: On a car with a drum/disc system, the front brakes lock up on light pedal application. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. d. Air in the hydraulic system. Any noises coming from your car may result in you ignoring the indicators. An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. This drag happens with drum brake systems as the springs wear or become rusty. d. Neither A nor B. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. Failure of lateral runout or thickness variation checks A car that pulls to one side can be annoying and also dangerous. Tech A states that in the Traction Control System, the control unit can independently apply individual brake units even though the driver is not stepping down on the brake pedal. Who is right? Which of the following can cause brake system dragging? 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. b. with the engine running The lens-maker's equation has three design parameters. Brake booster causing brake drag? | Dodge RamCharger Central a. Brake drag often occurs when the fluid in your system overheats. All the other answers are improper ways of adjusting drum brakes. Ok, im starting a new thread because the problem is not an alignment problem anymore. The other major way brakes act up is when they fail to disengage completely in one way or another. The sliding and moving parts of the brake system require lubrication to prevent them from binding. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. Technician B says insufficient clearance between the pads and caliper slider could be the cause. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. If you get no assist, you need a new check valve. if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. 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. In Fig. A only 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. 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. Question: The brakes on my new O4 Ford Explorer are dragging. Brake Noises: What Causes Them and How to Fix Them. d. Neither A nor B. That's why the power assist begins to function properly after the engine runs. It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. The caliper piston needs to move back into its bore with no binding. While starting the engine with the brakes applied, the pedal does not go down slightly. 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.