Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. What are possible causes? Correct answer D-A restricted disc brake caliper hose won't cause pedal pulsation. c. Replacing a ball joint Step 1: Access the drum brake adjustment star wheel. 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. Always replace components with genuine GM parts to avoid premature failure of brake system components. Correct answer B-If the amber light is on it indicates an ABS fault and the system will revert to regular brake operation without ABS. If you see the Brake Warning Light illuminated, it is probably a leak. The power booster uses engine vacuum to assist your leg when applying the brakes, and is nearly universal in modern cars. Auto Mechanical Practices Test; ASE Test Guide; Auto Mechanic Flash Cards; 2023 Edition. D. Brake pedal pulsation. Who is correct? One of the first components to engage goes by the name of the push rod. All of these would cause a low brake pedal, EXCEPT: It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. Copper corrodes easily which makes it a poor option. Who is right? Technician B 3 Basic Kinds of Valves in a Non-ABS System. Then you should try the brakes. The wheel cylinder is attached to the ________. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. Find out what these noises mean and what might fix them. c. Both A and B The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. 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. The air cleaner also can't cause a brake fluid leak. c. Both A and B Is this a caliper or could it be a blockage in the brake hose? 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. First, it can act like a restrictor in the line. 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. A brake hose problem like this can take two forms. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. 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. Which technician is most likely correct? The same factors can cause cable operated parking brakes to jam up as well, requiring a replacement of the parking brake cable. Answer A is correct. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. This leads to excessive pedal travel. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. 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. I recommend having this area of the brakes inspected first. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. The pictures below show the master cylinder under the brake pedal. Brakes, when applied must not disrupt steering geometry. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. A routine inspection would include all of the following EXCEPT. 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. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Answer: Yes, brake pads can cause problems for brakes on a car. That way, if there is a leak in one part of the system, it should only affect one front brake and one rear brake. 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. Search by Part Number(s), Keywords, or VIN, Chevy Brake Problems: Common Issues and How to Fix Them, How to Program Chevy Silverado Key Fob Remote, How to Reset Your Chevy or GMC Oil Change Light, How to Unlock Your Chevy or GMC Radio for Free, How to Update Chevy and GMC Navigation Units. Who is correct? When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. 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 Sometimes, though not very often, the brakes won't work, and it sounds like it's grinding for one or two seconds. 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. Continue scrolling to learn more about these common issues and their solutions. The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. A routine inspection would include all of the following EXCEPT. b. Four-wheel alignment Then, it should be backed off until there's a drag on the wheel. Excessive tire pressure These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. c. Both A and B The caliper piston needs to move back into its bore with no binding. Then, it's easier to empty once it's out. This article also includes a repair technique for noisy drum brakes that I found by trial and error. Answer B, glazed . Most instances of a hard pedal come down to a failure in the power boost system, whether vacuum based or hydro-boost (used mostly on diesels, we won't be covering it here). Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. A only All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Be careful with brake fluid; it is very corrosive when it gets on paint. D. Low brake fluid. A. b. Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. Beginner's Guide: What is ABS (and How Does It Work)? Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. Any noises coming from your car may result in you ignoring the indicators. 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. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. Typically a seized caliper or pads will cause a burning smell, a pull to one side, and dragging at one wheel, but it is possible for it to stick without those, and effectively lessening your braking by nearly half (if it is a front wheel, which provide 75% of the braking). d. Neither A nor B. Brake fluid expands as brake fluid temperature rises from normal braking. 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 you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. c. Parking brake out of adjustment Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. The three most common brake noises I encounter every day when talking to customers are a grinding sound, a thumping from the rear, and a squeak. Question: My brakes squeak only when I back up. This brake pulsation can be fixed very easily by having your rotors resurfaced (which is cheaper) or replaced (more expensive). 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! Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. 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. 1. A spongy brake pedal may be caused by: Tech B says that the faster a vehicle moving, the more braking power is needed. 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. c. Both A and B Question: A year and a half ago (from 78,000 to 88,000 miles), I had the whole brake system replaced, i.e., pad, rotor, and lines. If your brakes squeak and you want to know why, maybe I can help! The ABS (antilock brake system) amber light does not go off after the engine is started. Consider a system consisting of both objects A and B. 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. A only Who is right? Technician A A only Should I drive my car? What can cause this? Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. This leads to the brakes dragging. 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. The rear brake linings are soaked with axle grease but still have a lot of lining left on them. B only 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. Answer: The grinding sound may be something caught between the backing plate and rotor. They are not compensating for normal lining wear. Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. A only Brake drum machined beyond its limit I recommend having all the brake lines, calipers, and the master cylinder checked for leaks. initial cost 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) *, All of the following can cause brake pedal pulsation, EXCEPT, All of the following can cause brake system dragging, EXCEPT. This drag happens with drum brake systems as the springs wear or become rusty. While starting the engine with the brakes applied, the pedal does not go down slightly. a. c. Both A and B Bad front tires, or broken belts in a front tire, could cause it. I've included some pictures and FAQs. b. Arcing To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. measure the pad-to-caliper piston clearance. 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 says a parking brake not fully released could be the cause. After a master cylinders replaced and the brake system is bled what must happen? Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. Which of these can lead to brake pedal fade? You have questions like: Will my brakes fail? Continue with Recommended Cookies. C. The star adjuster should be adjusted until a slight drag on the wheel occurs. 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. Are they safe? The other three answers can lead to a low brake pedal. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks.
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