Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. a. 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? b. A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following? Who is correct? c. Leakage past the master cylinder cups Chevy Brake Problems: Common Issues and How to Fix Them Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. d. Neither A nor B. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Correct answer B-If the amber light is on, it indicates that there is an ABS fault. Brakes, when applied must not disrupt steering geometry. 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). 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. On a car with a drum/disc system, the front brakes lock up on light pedal application. Buying a new caliper may cost more but you will make up the cost with the time you save. First, it can act like a restrictor in the line. Question: What causes a brake pedal to depress all the way to the floor in a car? A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. You can also verify it by looking at the direction on the scan tool data list. Technician B says that the star wheel assembly should be lubricated on the floating end. When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. 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. A. 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. The power booster uses engine vacuum to assist your leg when applying the brakes, and is nearly universal in modern cars. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. Who is right? Then, it should be backed off until there's a drag on the wheel. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. b. B only There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. 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. Brake system to be inoperative Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? Correct answer C-Both techs are correct. b. Pulsation results from something loose in the system or by an unparallel rotor. Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Technician A 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. c. Both A and B Seized caliper piston Question: My brakes squeak only when I back up. b. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Answer: The brake fluid temperature rising and pressure building in the brake system. Seized wheel cylinder piston Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Technician A believes it's a defective proportioning valve issue. brakes midterm Flashcards - Cram.com B. Who is right? You may lose your brakes if you run out of travel before they are fully applied. It will need replacement or resurfacing. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. C. Dragging brakes Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. d. Metering valve. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. The steering wheel vibrates all the time and always veers to the left. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. The only fix I recommend for a faulty master cylinder is to replace it with a new one. Sketch each of your designs. 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. b. 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. The master cylinder seems to be okay. Pulsation:This is the symptom of a brake rotor that has warped. b. A bad master cylinder can introduce air into the lines, as can a failure at a caliper or wheel cylinder. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. So im getting drag on my front brakes, both sides, after i drive it about 15-20 miles i jack up the front end the the wheels are real tight to spin by hand and you can hear the pads screeching against the rotor. Lubricate the pads where the brake shoes ride on the backing plate of drum brakes. You notice brake fluid in the engine. A only I recommend having a thorough brake inspection by removing all calipers and inspecting all moving parts of each caliper, if everything looks good, examine the hydraulic part of the system. Step 1: Access the drum brake adjustment star wheel. b. VAV_\text{A}VA and I2I_2I2? 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. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Which technician is most likely correct? Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. b. 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. D. 400400400. Anything that has rubber in the brake system, such as the brake hoses, calipers, wheel cylinders, reservoir cap, ABS unit, master cylinder, proportioning valves, etc.all become junk. Correct answer D-Air causes a gap in the hydraulic fluid flow because the fluid has to compress the air before it can apply the piston. Brake rotors need to be refinished under all of these conditions EXCEPT: Return Springs: Weak or broken return springs will result in brake drag. Replacing the front strut You wouldnt pack your own parachute on your first jump, would you? Using the screwdriver, gently pry out the rubber grommet that protects this access cover. c. Pressure differential switch What's up with that? 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 Question: Only one wheel brakes on my 2000 Acura. 7 Symptoms of a Brake Caliper Sticking (and Common Causes) Personal Injury Attorney With Truck Accidents They following are three of them. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. Which is the correct way to service these brakes? Here are the top causes of a brake caliper sticking. If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. 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. Brake adjustment a. 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. That's why the power assist begins to function properly after the engine runs. Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. Hard Pedal: You may have a loss of power assist because the engine vacuum is low. Technician A says the quick take up valve must be depressed. b. D. Neither Technician. 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 steering wheel vibrates all the time and always veers to the left. It can also be the result in worn disc brake pads. 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. A vehicle with 4-wheel disc brakes has a brake squeal. Eventually, a sticking brake caliper will wear down the brake pads. I've included some pictures and FAQs. 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. The same factors can cause cable operated parking brakes to jam up as well, requiring a replacement of the parking brake cable. Technician A says the master cylinder pushrod adjustment is incorrect. a. This article also includes a repair technique for noisy drum brakes that I found by trial and error. The wheel cylinder is attached to the ________. B only Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. Consider a system consisting of both objects A and B. This also reduces braking power. To fix this problem you will need to replace the caliper. Question: I had problems with my brakes grinding and pulling to the right when braking. It will not be caused by lateral runout, which would cause brake chattering or pulsing. C. 200200200 You could also have a ballooning brake hose when the brakes are applied. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. When you make the final adjustments to the drum brakes: Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. 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. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . The ABS and TRACTION OFF indicator lights stay on while the engine is running. You could add shims, use a brake noise aerosol, or brake grease to the backs of the pads to dampen the noise. . ASE identifies suspension both . Who is right? All of the following items could cause this erratic pull EXCEPT: Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. You also want to use OEM clips and anti-squeal shims. 2320, what is the phase relationship between Many times the cause of an accident will be due to a problem with the brakes. Question: I have a 99 Honda Civic EX. ABS causing brakes to stick | TDIClub Forums In Fig. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. A. Brake dragging is commonly caused by broken or weak springs on the drum brakes. 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). 1. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. Or it's possible your brake booster push rod is out of adjustment. A only Assume the brakes are not applied. If you see the Brake Warning Light illuminated, it is probably a leak. Abnormal noise. c. Both A and B A vehicle has a very erratic brake pulling concern while applying the brakes. The rear brake linings are soaked with axle grease but still have a lot of lining left on them. a. 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. Electric Vehicle Research Paper Brake problems can be daunting if you don't know what's causing them. Poor stopping Residual check valve The ABS light doesn't go off after the engine starts. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. 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. Correct answer D-Both of these techs are wrong. When you are in a crisis situation like a brake problem, some mechanics will take advantage of the customer and over-sell the work that really needs to be done. Disc Brake System Flashcards | Quizlet 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. The drum brake adjuster is located under an access cover in the back of the drum brake. C. Both technicians Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. The other complaints wouldn't occur as a result. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Question: What makes a car's disc brakes drag hard after a 15-minute drive? The plugged compensator port leads to dragging brakes instead. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. Most modern brakes have rotors; older ones have drums, especially in the rear. This can be repaired by resurfacing or shims. This problem could be caused by a bad: 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. It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. Calculate the following quantities: The total initial kinetic energy of the system. Brake booster causing brake drag? | Dodge RamCharger Central 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? 4-wheel disc brakes on a vehicle are causing brake squeal. Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice Correct answer C-Both techs are correct. Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. B. If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. Is this possible? B only 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? Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. If it is too worn, you must replace it. Who is right? 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. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. Replace the defective part. Who is right? It does this through a small sliding valve operating on spring pressure. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. b. Four-wheel alignment A worn or corroded master cylinder bore causes excess pedal effort resulting in dragging brakes.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'freeasestudyguides_com-medrectangle-4','ezslot_3',116,'0','0'])};__ez_fad_position('div-gpt-ad-freeasestudyguides_com-medrectangle-4-0'); Brake Lines and Hoses: There may be pressure trapped in the brake line or hose after the pedal has been released. An automobile has a weight of 2700 lb and is traveling forward at 4 ft/s when it crashes into the wall. The other situations wouldn't be caused by the lack of free play. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Should I drive my car? When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. The brakes can fail if your hydraulic system or master cylinder is leaking. 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. Any noises coming from your car may result in you ignoring the indicators. The building pressure in the system results in brake drag and possible brake lockup. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. a. b. B. 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. d. Neither A nor B. This delay causes the spongy feel. Soft Pedal- The brake pedal is easy to push but there is less braking. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. Always use OEM recommended clips and anti-squeal shims. Who is correct? HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. B. . Correct answer C-The weak hydraulic brake hose causes a spongy pedal. Unusual brake pedal feel. Recently it takes longer to stop and I really have to put a lot of pressure on the brake pedal to come to a complete stop. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. This heat can be caused by a dragging brake unit. c. Both A and B Any pull caused by unevenly worn tires will be amplified when you step on the brakes. Answer B, glazed . Who is right? Excessive brake drag d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. Correct answer D-Both technicians are wrong because the problem is in the power booster. Brake fluid reservoir. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. . Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. This valve basically allows the rear drums to apply first in the system. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. a. b. 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. All of these might lead to a low brake pedal, EXCEPT: Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. 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. The other choices will not do this. C. Both technicians b. Caliper piston seized Technician B believes there is an issue with the lateral runout of the rotor. d. Brake light is illuminated. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. If the drum is machined beyond its limit, the contact surface moves further from the shoes. The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. 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. Beginner's Guide: What is ABS (and How Does It Work)? d. Neither A nor B, A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. Which of these can lead to brake pedal fade? DOT 5 Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. All the other answers are improper ways of adjusting drum brakes. Flashcards - ASE BRAKES - FreezingBlue 2. d. Neither A nor B. Overview: How To Use OBD-II Scanner to Check Engine Light Codes - What type of scanners are there. A drum or rotor that has deep scores in it will cause the brakes to grab. B. 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. On ABS systems that have a high-pressure accumulator, this is depressurized by: d. Repair leak and replace brake linings. B only To reduce disc brake squeal, all mating surfaces of the brake should be clean and lubricated. It doesn't have power assist until the engine runs for a minute, then it begins to work normally. d. Neither A nor B. A only Checking the diagnostic trouble codes is possible. If the brake drum is machined beyond its limit the contact surface is further from the brake shoes and they move outward to maintain contact with the drum, causing the brake pedal to drop toward the floor as additional brake fluid moves into the hydraulic system. Question: What if your car is going through brake fluid fast and your brakes don't want to work? variable hours is outside the range 0 through 80. 2023 The Arena Media Brands, LLC and respective content providers on this website. I replaced the brake pads again, both calipers and rotors. What could be the issue? Who is correct? Which of the following would NOT cause a disc break to drag? Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled. 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. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. See less 79 RC bought from original owner in 2006 Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. 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. 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. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. Most braking systems work on a diagonal braking design for safety reasons; that is, the left front and right rear brakes work together and so do the right front and left rear. Cause: Rear Wheel lockup or squatting has many causes. A check valve that is faulty can also let vacuum bleed out. which of the following can cause brake system dragging C. Brake adjustment Brake drag often occurs when the fluid in your system overheats. Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. C. Both Technicians Question: My car won't start unless I press really hard on the brakes. Who is correct? ASE PRETEST QUIZLET Flashcards | Quizlet Technician A a. auto tech review 3 Flashcards | Quizlet Technician A says a defective proportioning valve could be the cause. 4-wheel disc brakes on a vehicle are causing brake squeal. Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. Which of the following can cause brake system dragging? Technician A says a parking brake not fully released could be the cause. The other three answers wouldn't cause the same issues. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. Bad front tires, or broken belts in a front tire, could cause it. A only 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. 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 A is correct. The wheel cylinder is attached to the ________. A. A spongy brake pedal may be caused by: They are not compensating for normal lining wear. 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. c. Brinelling A power assist brake booster push rod that is to short will cause which of the following? Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. The brake pedal starts to feel spongy and low even though all the adjustments have been made according to the specifications. _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. Correct answer B-The short push rod length has to travel farther to make contact. Then you want to back it off until the wheel starts to spin freely. The sliding and moving parts of the brake system require lubrication to prevent them from binding. Check your brake hoses for anomalies. 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). The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. Technician B is wrong because backing off the castle nut will not cause the bearing to overheat. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. The consent submitted will only be used for data processing originating from this website.
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