We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. Technician B says the cause could be a stuck closed residual check valve in the hose from the intake manifold to the power brake booster. d. Repair leak and replace brake linings. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. Again, you will have to measure the drums to determine if they can be resurfaced or not. Who is right? d. A faulty power booster. The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. 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. Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. Who is correct? B only It will need replacement or resurfacing. Replacing sealed wheel bearing 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! The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. . 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). However, it can also be due to fluid loss or a low fluid level. I replaced the brake pads again, both calipers and rotors. 3 Mechanical Causes of Brake Drag - Radial Tire Service Question: Will a bad master cylinder cause the calipers to stick? A only 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. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. Rear Brake Drag or Lockup - Drum Brakes - Phoenix Systems Regardless, I recommend having a thorough brake inspection by an experienced mechanic. Hard Pedal: You may have a loss of power assist because the engine vacuum is low. d. Air in the hydraulic system. d. Fluting. Technician A says the master cylinder pushrod adjustment is incorrect. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. Calculate the following quantities: The total initial kinetic energy of the system. Auto Test -sambooy Flashcards | Quizlet Brake drag often occurs when the fluid in your system overheats. You may lose your brakes if you run out of travel before they are fully applied. Technician B 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. 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. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. They will need to be resurfaced. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. Is this possible? 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. 505050 If the slide pins are your problem, they need to be cleaned and lubricated or replaced. 1. Been there, done that! B. Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. If you have rear disc brakes, this procedure may not work because some makes and models have a separate emergency brake, which is connected not to the rear rotor and caliper, but to a special drum inside the rear rotors with a separate braking system. 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. Write the correct spelling for Middle layer of skin. After a master cylinders replaced and the brake system is bled what must happen? After that, fixing it is often easy with the help of your Haynes manual. The consent submitted will only be used for data processing originating from this website. b. If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. 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. Technician A The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Technician A says the quick take up valve must be depressed. All of these would cause a low brake pedal, EXCEPT: I changed the brake pads, but that didn't help much. a. Brake fade is when the brake fluid is contaminated, so it causes a soft brake pedal, air in the lines, leaking master cylinder, frozen or seized caliper pins or piston, worn out pads, and glazed rotors. d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. 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. They need to be replaced at once. All the other answers could occur. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. The pictures below show the master cylinder under the brake pedal. Technician A is wrong because excessive rotor runout will cause brake pulsations with no effect on wear. Technician A says the cause could be a leaking power brake booster diaphragm. C. pumping the brake pedal 25 times with the ignition switch off Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. Check out the system to make sure that you do not have a caliper leak or an oil leak. You should clean or replace the adjusters to eliminate the problem. d. Neither A nor B, A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. The other three answers can lead to a low brake pedal. Are they safe? 1) Caliper Slides The caliper has grooves which secure the brake pads in place and allow the pads to slide inward after you put your foot on the brake pedal. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. Brake rotors need to be refinished under all of these conditions EXCEPT: Technician A says a parking brake not fully released could be the cause. We and our partners use cookies to Store and/or access information on a device. B only Who is correct? Answer B, glazed . Answer: There are a few options to look at here. ASE identifies suspension both . Troubleshooting: Common Brake Issues and Causes 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. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. You notice brake fluid in the engine. Glazed brake pads result from excessive heat. c. Both A and B Tech B states that this function can also be carried out by the driver in manual mode. C. Brake adjustment Residual check valve To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. Correct answer D-A restricted disc brake caliper hose won't cause pedal pulsation. Brake fluid reservoir. Correct answer B-Insufficient clearance between the pads and caliper slider causes the slider not to move and only applies one brake pad causing only that pad to wear. If the piston is stuck, and the fluid pressure can't push it back into the bore easily, the pressure on the pads will be uneven and the car will pull. 7. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. Brakes, when applied must not disrupt steering geometry. 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. 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. Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. Technician A is wrong because the parking brake would only affect the red brake light. The steering wheel vibrates all the time and always veers to the left. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. What Causes Brake Drag and How to Reduce It - Autos.com Checking the diagnostic trouble codes is possible. c. Both A and B Brake failure is common if the fluid leaks out of the system. 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. The brakes of large trucks are different. Any pull caused by unevenly worn tires will be amplified when you step on the brakes. Which of the following can cause brake pedal pulsation? The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. When you make the final adjustments to the drum brakes: c. Low brake fluid Eventually, a sticking brake caliper will wear down the brake pads. Pulsation:This is the symptom of a brake rotor that has warped. Which of these can lead to brake pedal fade? Correct answer C-Both techs are correct. Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. 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. Technician B Many times the cause of an accident will be due to a problem with the brakes. Brake pads are being replaced on a vehicle with four-wheel disc brakes. A only Who is right? This valve basically allows the rear drums to apply first in the system. Correct answer D-The metering valve controls the pressure to the front disc brakes on a combination system and if defective can allow too much pressure causing a lock-up. If it is too worn, you must replace it. Technician B 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. 2. Technician 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. 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? Why is this enzyme likely to include a side chain such as Ser in its active site? d. Seized caliper piston. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. All of the following items could cause this erratic pull EXCEPT: ASE T-4 Brakes Flashcards - Cram.com c. Replacing a ball joint 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. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Question: What if your car is going through brake fluid fast and your brakes don't want to work? C. The star adjuster should be adjusted until a slight drag on the wheel occurs. Step 1: Access the drum brake adjustment star wheel. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. a. When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. 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. This can be repaired by resurfacing or shims. b. You have questions like: Will my brakes fail? Is it a caliper problem? 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? Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. Replace them if you see that they have oil, fluid or grease on them. A soft brake pedal is a MAJOR brake issue. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. Electric Vehicle Research Paper B only 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. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. A master cylinder may fail in two ways: internally or externally. What is the cause? Who is right? Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. If you see the Brake Warning Light illuminated, it is probably a leak. 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. Answer: The grinding sound may be something caught between the backing plate and rotor. 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.. This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. You can pump the brakes before application to help offset this problem, but you need to get it fixed. 2320, what is the phase relationship between 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). Brake adjustment c. Both A and B b. Who is right? Any noises coming from your car may result in you ignoring the indicators. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? A short power assist brake booster push rod will lead to which of these? When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. All of these might lead to a low brake pedal, EXCEPT: b. Proportioning valve The other choices will not do this. Question: I have a 99 Honda Civic EX. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. To further reduce the noise, do not machine the rotor more than needed. The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. Answer: The brake fluid temperature rising and pressure building in the brake system. d. while driving the vehicle slowly. c. Both A and B d. Metering valve. The other complaints wouldn't occur as a result. If you get no assist, you need a new check valve. 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. 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. d. Brake light is illuminated. Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. A only Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. An example of data being processed may be a unique identifier stored in a cookie. 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. A pull when braking may also have nothing to do with brakes. 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. Who is right? C. Dragging brakes Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 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 auto tech review 3 Flashcards | Quizlet Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. Bleed the brake lines as recommended by Chevy to fix this. This is a very common brake issue on all makes and models: when youre driving at highway speeds and you apply your brakes, the steering wheel shakes. If you have a soft or sinking brake pedal and are looking for information on what's causing it or what you should do next, you'll find the answers here. Correct answer C-An ABS with a high-pressure accumulator, you depressurize it by pumping the brake pedal 25 times while the ignition switch is off. Which technician is most likely correct? There are different causes for brake drag. Why is this? First, it can act like a restrictor in the line. c. Brinelling b. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. Troubleshooting A Hard Brake Pedal | Classic Car Restoration Club You shouldn't waste your valuable time trying to rebuild it. Although, if you have a fluid level sensor in the master cylinder reservoir, you may see this light come on when the fluids are low. I seem to remember a similar post where the cause was found to be the brake pedal not returning fully, but not noticed by the driver. The only fix I recommend for a faulty master cylinder is to replace it with a new one. The ABS warning light usually comes on when there is this type of problem. Who is correct? 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. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. 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). If your brake pedal feels squishy, "like stepping on a plum," and won't stop on the way down unless you pump it, or the brake pedal sinks to the floor with little or no resistance, you have a dangerous situation and should NOT drive any further! 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. a. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Question: What makes a car's disc brakes drag hard after a 15-minute drive? There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels.
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