Should I drive my car? There are only about nine evil mechanics in the world, they just move around a lot! Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. You can also verify it by looking at the direction on the scan tool data list. Correct answer C-Both technicians are correct. Are they safe? Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. d. Air in the hydraulic 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). Al+ClX2AlClX3. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. A. a. 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. The ABS (antilock brake system) amber light does not go off after the engine is started. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. Manage Settings Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Now I have loud grinding sounds coming from the front left tire. A check valve that is faulty can also let vacuum bleed out. 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. Another possibility is that the pistons got bent, during a brake job or a car accident, and can't move freely anymore, causing the caliper to bind and limiting the amount of pressure to the pads. Brake problems can be daunting if you don't know what's causing them. 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). Which of these can lead to brake pedal fade? The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. Replace the defective part. Using the screwdriver, gently pry out the rubber grommet that protects this access cover. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. c. Replacing a ball joint What could be the cause of the problem? 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. Who is correct? You may also need to have the drum or the rotors replaced or resurfaced because you waited too long to change the shoes and pads. 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 only What is the most likely reason? This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. c. Both A and B d. Neither A nor B. 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 Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. Here is the list of possible causes: Service and parking brake adjustment Rear brake hardware Shoe lands or bosses GM clip in wheel cylinders Brake drum condition Brake shoe contamination Brake valving Friction material 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? "Scratcher" and "sensor" are types of disc brake pad __________ indicators. B. A vehicle has a very erratic brake pulling concern while applying the brakes. A clogged fluid return hole in the master cylinder can cause all four wheels to drag, because the fluid sent to the wheels when you press the pedal can't return and let the pressure off. The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. It does this through a small sliding valve operating on spring pressure. How To Determine Cause of Brake Drag. 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. Questions are welcome. Many times the cause of an accident will be due to a problem with the brakes. Answer: The grinding sound may be something caught between the backing plate and rotor. A. 3 Basic Kinds of Valves in a Non-ABS System. However, it can also be due to fluid loss or a low fluid level. 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. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. The other three answers can lead to a low brake pedal. Be careful with brake fluid; it is very corrosive when it gets on paint. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. Technician B says insufficient clearance between the pads and caliper slider could be the cause. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. a. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. 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. _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. Technician B Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? a. a. This article takes a closer look at three common culprits. Question: My rear inner pads wear down faster than the outer ones. The ABS and TRACTION OFF indicator lights stay on while the engine is running. 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. Bleed the brake lines as recommended by Chevy to fix this. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. 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. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Technician A says the cause could be a leaking power brake booster diaphragm. Excessive tire pressure B only Technician A A only Seldom does this result in a car that won't move at all, but driving with the brakes dragging is unsafe and will result in even more damage in a short amount of time if not repaired. b. A master cylinder may fail in two ways: internally or externally. To get a sense of the scale of the energy, if we were to use this energy to create electron-positron pairs, approximately how many pairs could we create? d. A faulty power booster. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. A. Slight scoring or heat spots Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. D. Neither technician. Brake dragging is commonly caused by broken or weak springs on the drum brakes. In case these terms are new to you, real quick, I'll tell you that to stop the car, the master cylinder sends out fluid through tubes under pressure to drive a pincher (a caliper) that presses a pad or shoe against a metal disc (rotor) or drum. Which technician is most likely correct? An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. b. There are different causes for brake drag. Correct answer C-Both techs are correct. 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 Is it a caliper problem? D. Brake pedal pulsation. Who is right? When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. A. Sinking Pedal: You may notice this while sitting at a stop light. a. with the engine off 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? What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? You also want to use OEM clips and anti-squeal shims. Technician A says the quick take up valve must be depressed. The common cause of this is a broken or weak retracting spring on drum brakes, corroded or jammed caliper piston, corroded mounting pins or the bushings on a floating caliper, the drum brake self-adjusters are overextended or there is an emergency brake cable that is sticking or is frozen in place. 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. Technician A states that the parking brake is not fully released. c. Both A and B Typically rusted rotors or drums only happen when a car has been sitting for a long period. d. Neither A nor B. A drum or rotor that has deep scores in it will cause the brakes to grab. Who is right? The only fix I recommend for a faulty master cylinder is to replace it with a new one. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. A soft brake pedal is a MAJOR brake issue. Frozen caliper piston All of the following items could cause this erratic pull EXCEPT: A faulty proportioning valve or master cylinder could also cause a pull to one side when braking; this is unusual but it does happen. Then, it needs to be backed off until the wheel begins to spin freely. The vehicle pulls to the side under heavy braking If you work by process of elimination, starting with the most likely cause and working through to more complex issues, you can easily diagnose the problem yourself. Continue scrolling to learn more about these common issues and their solutions. Question: The brakes on my new O4 Ford Explorer are dragging. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. 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? Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Question: What causes a brake pedal to depress all the way to the floor in a car? Bad front tires, or broken belts in a front tire, could cause it. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. 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? 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. Buying a new caliper may cost more but you will make up the cost with the time you save. B. loosening the bleeder screw on the accumulator with the ignition switch on The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Answer B, glazed . If your whole car shakes when your brakes are applied, it could be just your rear brakes. A only tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. 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. Which of the following conditions can cause brake pedal fade? Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? Answer: This means that you have a leak in the system and you most likely have air in the brake lines. A. B only Brake rotors need to be refinished under all of these conditions EXCEPT: Erratic brake pulling occurs on a vehicle when the brakes are applied. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as overextended self-adjusters. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. 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. 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? Question: Does an emergency brake in a car not work after an accident? Who is right? Technician A is working on a vehicle that was brought in with excessive brake pedal travel. 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. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? To further reduce the noise, do not machine the rotor more than needed. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. Air and vaporized fluid are compressible and, if allowed into a hydraulic brake system, the brake pedal will feel spongy and the force transmitted to the lining will be reduced. a. You can resurface the rotors if they are still thick enough. D. Neither Technician. Who is right? 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. Who is correct? Who is right? Lubricate slide pins on disc brakes to prevent brake drag and binding. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Here are five of the most common brake problems I run into, starting with the most serious. Steering wheel shakes when brakes are applied. They will need to be resurfaced. 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. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. A. This article also includes a repair technique for noisy drum brakes that I found by trial and error. Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. Residual valves are used to maintain constant pressure on the brake system. 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. Then, it's easier to empty once it's out. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. d. Neither A nor B. C. 200200200 The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. The star adjuster should be adjusted one full turn to back the shoes away from the drum. . Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. This brake pulsation can be fixed very easily by having your rotors resurfaced (which is cheaper) or replaced (more expensive). Answer: There are quite a few possibilities for this problem. b. Four-wheel alignment Or it's possible your brake booster push rod is out of adjustment. Then you should try the brakes. You could also have a ballooning brake hose when the brakes are applied. To determine if your rear brakes are the problem, you need to test them in isolation. Poor stopping D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. Abnormal noise. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. 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. It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly.
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