When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. 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. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. Technician B says the cause is a faulty residual pressure check valve admitting air. Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. 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. 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. The other major way brakes act up is when they fail to disengage completely in one way or another. D. Neither technician. a. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. d. Steering gear problem. a. You can resurface the rotors if they are still thick enough. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. D. Neither technician. Technician A says excessive rotor run out could be the cause. Electric Vehicle Research Paper Excessive brake drag Technician A is working on a vehicle that was brought in with excessive brake pedal travel. B only Technician B Brake adjustment D. Noticeable brake pulsation. First, it can act like a restrictor in the line. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Again, you will have to measure the drums to determine if they can be resurfaced or not. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. To determine if your rear brakes are the problem, you need to test them in isolation. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. Question: Only one wheel brakes on my 2000 Acura. C. Brake adjustment 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. Brake problems can be daunting if you don't know what's causing them. d. Neither A nor B. Thus, there are many ways to design a lens that has a particular focal length in air. DOT 5 Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. Bleed the brake lines as recommended by Chevy to fix this. If this is what is going on, you need to identify and replace the faulty part. If your rear drums are the cause of the brake pulsation, you will feel the pulsation at this time, and the car will shake when the emergency brake is applied. b. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. A. Or it's possible your brake booster push rod is out of adjustment. 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. 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. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. 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. 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. b. Technician A believes it's a defective proportioning valve issue. d. Neither A nor B, A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. Any noises coming from your car may result in you ignoring the indicators. The other three answers can lead to a low brake pedal. This can be repaired by resurfacing or shims. If the slide pins are your problem, they need to be cleaned and lubricated or replaced. The brakes of large trucks are different. You can pump the brakes before application to help offset this problem, but you need to get it fixed. a. This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. 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. 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. 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). A only Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. One of the first components to engage goes by the name of the push rod. You could add shims, use a brake noise aerosol, or brake grease to the backs of the pads to dampen the noise. Sinking Pedal: You may notice this while sitting at a stop light. If your brakes squeak and you want to know why, maybe I can help! A) Internal master cylinder leak B) Warped rotors C) Both A and B D) None of the above None of the above If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? 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. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. Then, it should be backed off until there's a drag on the wheel. b. with the engine running Question: I just had brakes and rotors done two months ago on my vehicle. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. 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. A. Correct answer C-New brake rotors don't need to be refinished. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. Technician A is wrong because excessive rotor runout will cause brake pulsations with no effect on wear. Who is right? Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} Write the correct spelling for Middle layer of skin. Return Springs: Weak or broken return springs will result in brake drag. Which of the following can cause brake pedal pulsation? b. Four-wheel alignment 3 Basic Kinds of Valves in a Non-ABS System. Replace the brake linings The brake pedal is firm when applied. This delay causes the spongy feel. d. Neither A nor B. 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. In Fig. 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. 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). 4-wheel disc brakes on a vehicle are causing brake squeal. They will need to be resurfaced. 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. 7. 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 building pressure in the system results in brake drag and possible brake lockup. Is it a caliper problem? 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.. 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 Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? Who is correct? 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? Assume the brakes are not applied. b. Question: My rear inner pads wear down faster than the outer ones. Answer: Yes, brake pads can cause problems for brakes on a car. B only Cause: Rear Wheel lockup or squatting has many causes. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. The component in the Figure is involved what procedure? 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). a. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. c. Excessive brake pedal travel Questions are welcome. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? 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. Answer: There are quite a few possibilities for this problem. c. Leakage past the master cylinder cups d. Neither A nor B. That bleeds out any vacuum. B only Here are the top causes of a brake caliper sticking. Seized wheel cylinder piston d. Neither A nor B. B. B only Answer B, glazed . Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. 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. Technician A says a parking brake not fully released could be the cause. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. b. One of the first symptoms of bad or failing drum brakes is unusual brake pedal feel. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. The other choices do not affect this concern. Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. c. Both A and 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. Slight scoring or heat spots 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 master cylinder seems to be okay. What can cause this? A. Question: Does an emergency brake in a car not work after an accident? Is this possible? Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. Who is right? 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. 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? Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Erratic brake pulling occurs on a vehicle when the brakes are applied. A restricted disc brake caliper hose might cause all of these EXCEPT: Technician A says a defective proportioning valve could be the cause. What is the cause? If it is too worn, you must replace it. Technician B says backing off the castle nut will cause the bearing to overheat. Checking the diagnostic trouble codes is possible. The technician believes there is most likely an issue with the hydraulic system. Who is right? d. Fluting. Correct answer B-The short push rod length has to travel farther to make contact. Ok, im starting a new thread because the problem is not an alignment problem anymore. Poor stopping Why is this enzyme likely to include a side chain such as Ser in its active site? Always use OEM recommended clips and anti-squeal shims. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. All of the following items could cause this erratic pull EXCEPT: C. Installation of a new brake rotor . Many times the cause of an accident will be due to a problem with the brakes. Correct answer C-Both techs are correct. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. A hydraulic system uses the incompressible nature of fluid to transfer force from your brake pedal all the way to your brake caliper, causing it to close around the rotor and slow the momentum of your wheel. b. Arcing 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. Check your pads for any type of contamination. An often-misdiagnosed cause of pull is a collapsed brake hose. 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. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. 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. The pictures below show the master cylinder under the brake pedal. Technician A Who is correct? c. Defective metering valve. Which is the correct way to service these brakes? The wheel cylinder is attached to the ________. 2. They can also cause you to use more fuel. A only Tech B states that this function can also be carried out by the driver in manual mode. 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. c. Both A and B Correct answer D-A seized caliper piston could cause the pedal to be high with reduced braking power. Technician A This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. If this is your problem, then the fix is to resurface the rear drums or replace them. Who is right? 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. When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. A vehicle is equipped with a vacuum brake booster. Brake dragging is commonly caused by broken or weak springs on the drum brakes. I've included some pictures and FAQs. Question: Will a bad master cylinder cause the calipers to stick? You shouldn't waste your valuable time trying to rebuild it. d. Metering valve. All the other answers are improper ways of adjusting drum brakes. 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. Auto Mechanical Practices Test; ASE Test Guide; Auto Mechanic Flash Cards; 2023 Edition. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. A. Typically rusted rotors or drums only happen when a car has been sitting for a long period. c. Both A and B A only Technician A believes that you must depress the quick take up valve. Question: My car has power brakes and used to stop on a dime. b. VAV_\text{A}VA and I2I_2I2? Question: What causes a brake pedal to depress all the way to the floor in a car? Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. a. 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. What could be the cause of the problem? See less 79 RC bought from original owner in 2006 All the other answers could occur. Loose wheel bearing HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. A. Copper corrodes easily which makes it a poor option. Brake system to be inoperative The ABS (antilock brake system) amber light does not go off after the engine is started. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. c. with the vacuum hoses removed A slow descent of the brake pedal means that the pressure is leaking out of the master cylinder. Who is right? Seized caliper piston Here are five of the most common brake problems in cars. c. Both A and B B only It's possible your ABS module is no good. Correct answer C-Both techs are correct. 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. Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. Technician A states that the parking brake is not fully released. Check out the system to make sure that you do not have a caliper leak or an oil leak. 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. Question: My Chevrolet 2006 has some braking problems. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. a. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. Sketch each of your designs. Why is there a rear knocking noise from the drums when applying the brakes? Technician A says to check the TCS and ABS diagnostic trouble codes. A only a. 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. DOT 3 brake fluid should not boil until it gets above 400 degrees Fahrenheit, but old brake fluid that has absorbed water can boil at as little as 284 degrees, which is why it needs to be changed every other year. d. Neither A nor B. This heat can be caused by a dragging brake unit. To reduce this, the mating surfaces need to be cleaned and lubricated. A slight gap should be present between the pushrod and the master cylinder. d. Neither A nor B, The front wheel bearings are being adjusted. c. Low brake fluid Question: What makes a car's disc brakes drag hard after a 15-minute drive? A brake hose problem like this can take two forms. b. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. I highly recommend having your car towed; this is a very dangerous situation, and the problem needs to be fixed before the car is driven. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. Technician A believes it's a defective proportioning valve issue. The vacuum booster can be checked by pumping the pedal a few times while the engine is off. Question: What if your car is going through brake fluid fast and your brakes don't want to work? This article also includes a repair technique for noisy drum brakes that I found by trial and error. Correct answer A-Excessive brake pedal travel is a sign of low hydraulic fluid, air in the hydraulic system, and can be caused by some mechanical issues as well. What could be the issue? The dragging sound could be caused by the brake drum not fully releasing when the brake is released. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. If you see the Brake Warning Light illuminated, it is probably a leak. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. Replace them if you see that they have oil, fluid or grease on them. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. Correct answer C-Both technicians are correct. Answer: There are a few options to look at here. Continue with Recommended Cookies. If you are trying to bring a project car back to life, but can't get it to roll, chances are this is the problem. B. What's more, I'll teach you to fix it in either case. Then, it's easier to empty once it's out. 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). Which of the following can cause brake system dragging? Correct answer A-the biggest downside of drum brakes is their susceptibility to fading. a. ABS Diagnostic Trouble Code set a. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Low or uneven tire pressure can cause a pull. The drum brake adjuster is located under an access cover in the back of the drum brake. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. Who is correct? Brakes, when applied must not disrupt steering geometry. A drum or rotor that has deep scores in it will cause the brakes to grab. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. C. Dragging brakes c. VAV_\text{A}VA and ITI_\text{T}IT? 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! In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. You notice brake fluid in the engine. It will need replacement or resurfacing. B only Brake drag often occurs when the fluid in your system overheats. 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. 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. Other times it is fine. Now I have loud grinding sounds coming from the front left tire. This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. Find out what these noises mean and what might fix them. The star adjuster should be adjusted until there is a slight drag on the drum. a. Technician B C. Both technicians Next, hold your foot to the pedal while starting the engine. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. Brake drum machined beyond its limit
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