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. Cause: Rear Wheel lockup or squatting has many causes. 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). If this is what is going on, you need to identify and replace the faulty part. 4-wheel disc brakes on a vehicle are causing brake squeal. This drag happens with drum brake systems as the springs wear or become rusty. Who is right? a. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. What is this type of bearing failure called? Disc Brake System Flashcards | Quizlet 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? Technician A is wrong because the parking brake would only affect the red brake light. They can also cause you to use . To further reduce the noise, do not machine the rotor more than needed. Answer: No, you should really look for a new mechanic, pads maybe if you drive a ton of miles in stop and go traffic or you're a mail carrier, lines are rarely replaced. Continue with Recommended Cookies. When that happens, I release the brakes and apply them again super fast. Who is correct? Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. An often-misdiagnosed cause of pull is a collapsed brake hose. In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. See less 79 RC bought from original owner in 2006 Question: What if your car is going through brake fluid fast and your brakes don't want to work? It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. b. Al+ClX2AlClX3. I replaced the brake pads again, both calipers and rotors. If every time you apply your brakes, your brake pedal pulses up and down, the problem is usually caused by the rotors being warped or out of true. The plugged compensator port leads to dragging brakes instead. d. Steering gear problem. Replace the hydrobooster. ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 B. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. Replace the defective part. b. Four-wheel alignment The technician believes there is most likely an issue with the hydraulic system. To fix this problem you will need to replace the caliper. 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. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. A routine inspection would include all of the following EXCEPT. Brake pad friction materials may be manufactured from any of the following EXCEPT: makes a noise if the brake pads are due to be replaced. It's also possible to check the blink codes with the DLC. Replacing sealed wheel bearing Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. eCFR :: 49 CFR Part 396 -- Inspection, Repair, and Maintenance Technician A is working on a vehicle that was brought in with excessive brake pedal travel. You can verify the wheel speed sensor operation while comparing the four-wheel outputs to the data list. d. Neither A nor B. Answer: Either the brake pads need to be replaced, or you could try shaving off the leading rear edge of the brake pad at a 45-degree angle and see if that helps. After that, fixing it is often easy with the help of your Haynes manual. Can you help me understand where the problems are and what I should repair or replace? Five Common Brake Problems in Cars - AxleAddict A pull when braking may also have nothing to do with brakes. Technician A Who is right? 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 To put this discussion about brake proportioning valves in context, there are actually three basic kinds of valves in play in a non-ABS system. B. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. Much like our earlier examination of clutch issues, there are two general failure modes for brakes: They aren't engaging well enough, or they aren't disengaging. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Which of the following can cause brake pedal pulsation? If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. auto tech review 3 Flashcards | Quizlet Technician A says to check the TCS and ABS diagnostic trouble codes. B. There are only about nine evil mechanics in the world, they just move around a lot! The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. Write the correct spelling for Middle layer of skin. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Technician B says that the star wheel assembly should be lubricated on the floating end. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. Technician A says the master cylinder pushrod adjustment is incorrect. The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. 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). 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. Questions are welcome. Who is correct? While these are the most common causes of brake issues on your Chevy, you should never allow your brakes to go bad. d. Seized caliper piston. 2. C. Both technicians B only B only If there is plenty of fluid in evidence, check if it is hot; repeated hard use, towing, descending a steep hill, or a dragging calipercan boil the fluid. Then you should try the brakes. b. if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. If you do a lot of highway driving and you happen to be hard on your brakes, you will probably run into this problem many times in the life of your car. 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. Consider a system consisting of both objects A and B. A. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. The caliper piston needs to move back into its bore with no binding. d. Neither A nor B. A drum or rotor that has deep scores in it will cause the brakes to grab. Question: My car won't start unless I press really hard on the brakes. d. Brake light is illuminated. How to Adjust Drum Brakes | YourMechanic Advice Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. 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 Which technician is most likely correct? That's why the power assist begins to function properly after the engine runs. Here are the top causes of a brake caliper sticking. Auto Test -sambooy Flashcards | Quizlet b. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. DOT 5 Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. A) Internal master cylinder leak B) Warped rotors C) Both A and B D) None of the above None of the above ASE PRETEST QUIZLET Flashcards | Quizlet Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. 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. Brakes Flashcards | Quizlet What is the cause? Correct answer D-A seized caliper piston could cause the pedal to be high with reduced braking power. 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. Technician B This article also includes a repair technique for noisy drum brakes that I found by trial and error. The master cylinder, where it attaches to the brake pedal. a. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. Symptoms of a Bad or Failing Brake Drum | YourMechanic Advice They need to be replaced at once. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. a. A check valve that is faulty can also let vacuum bleed out. What's up with that? To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. Troubleshooting: Common Brake Issues and Causes With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. Answer: There are quite a few possibilities for this problem. Be careful with brake fluid; it is very corrosive when it gets on paint. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. Technician B believes that the brakes can't be bled. b. Proportioning valve 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. Find out what these noises mean and what might fix them. Answer: The grinding sound may be something caught between the backing plate and rotor. 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. 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. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. C. Both technicians Poor stopping Mechanical fading is when the drum gets too hot and expands away from the linings. A low brake pedal can also be due to a fluid leak or worn brake linings. D. Neither technician. a. ABS Diagnostic Trouble Code set Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. Step 1: Access the drum brake adjustment star wheel. It's good to understand what the cause of your problem might be before a mechanic starts talking about the need to replace this or that. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. a. In this article, I will explain the most common reason for a slipping automatic transmission and the most common reason for a slipping standard transmission. This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. D. Brake pedal pulsation. Copper corrodes easily which makes it a poor option. What do you think the problem might be? Here are five of the most common brake problems I run into, starting with the most serious. The master cylinder actually contains two pistons and seals, which in simpler systems controlled the front and back brakes separately, or the diagonally opposite wheels, so at worse you would only lose half your brakes. When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. Question: My Chevrolet 2006 has some braking problems. If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. Brake Chatter: Warped or improperly finished rotors will cause this noise. Excessive brake drag The building pressure in the system results in brake drag and possible brake lockup. D. Noticeable brake pulsation. Technician B says air trapped in the hydraulic system 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. It doesn't have power assist until the engine runs for a minute, then it begins to work normally. The other complaints wouldn't occur as a result. 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. d. Air in hydraulic system. Technician A is wrong because recalibration is not required for these sensors. On ABS vehicles, the ABS pump or the high-pressure accumulator can be the cause of power loss. C. pumping the brake pedal 25 times with the ignition switch off d. Neither A nor B. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. D. Neither technician. Buying a new caliper may cost more but you will make up the cost with the time you save. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. b. All the other answers are improper ways of adjusting drum brakes. a. In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. c. Parking brake out of adjustment b. Arcing What are possible causes? Technician A says a parking brake not fully released could be the cause. Loose wheel bearing If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. Is this possible? Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? b. Question: What causes a brake pedal to depress all the way to the floor in a car? Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. A. Tech B says that the faster a vehicle moving, the more braking power is needed. c. Both A and B D. 400400400. Who is right? Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. D. Low brake fluid. All of the following items could cause this erratic pull EXCEPT: Glazed brake pads result from excessive heat. b. Caliper piston seized The caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. The dragging sound could be caused by the brake drum not fully releasing when the brake is released. The ABS and TRACTION OFF indicator lights stay on while the engine is running. You may lose your brakes if you run out of travel before they are fully applied. . Who is right? A only 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. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. Excessive tire pressure Turn the star-shaped adjuster a few times. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. measure the pad-to-caliper piston clearance. a. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. Air in the hydraulic system This delay causes the spongy feel. Question: Will a bad master cylinder cause the calipers to stick? It does this through a small sliding valve operating on spring pressure. Technician B believes there is an issue with the lateral runout of the rotor. C. Brake adjustment Brake fluid reservoir. I've included some pictures and FAQs. Then, it should be backed off until there's a drag on the wheel. If you do, it could be a matter of minutes until you smash into something. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Most modern brakes have rotors; older ones have drums, especially in the rear. Why is this? b. On a car with a drum/disc system, the front brakes lock up on light pedal application. If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. B only The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Bad Brake Caliper Symptoms: 7 Signs to Watch Out For What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Which of the following would NOT cause a disc break to drag? Question: My rear inner pads wear down faster than the outer ones. a. Technician A says you torque the adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. Are they safe? Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. variable hours is outside the range 0 through 80. Sketch each of your designs. Answer: The brake fluid temperature rising and pressure building in the brake system. B. The ABS (antilock brake system) amber light does not go off after the engine is started. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. C. Dragging brakes This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. d. Neither A nor B. Answer A is correct. Which of the following is the proper procedure? c. Low brake fluid Eventually, a sticking brake caliper will wear down the brake pads. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. Pulsation results from something loose in the system or by an unparallel rotor. C. Both Technicians You will find the booster between the master cylinder and the firewall in your engine compartment. 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.
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