A. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. A only Personal Injury Attorney With Truck Accidents They following are three of them. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. One of the first symptoms of bad or failing drum brakes is unusual brake pedal feel. You can do this test if your emergency brake handle is near the center console and it is the style that you pull up with your hand. Technician B says that the star wheel assembly should be lubricated on the floating end. An example of data being processed may be a unique identifier stored in a cookie. Slight scoring or heat spots They are not compensating for normal lining wear. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. They can also cause you to use . Which technician is most likely correct? A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. Brake Problems Caused By Fluid Contamination You will find the booster between the master cylinder and the firewall in your engine compartment. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. c. Seized caliper piston on the other side Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. Technician B says the wheel's direction of rotation can be verified by looking at the wheel direction on the scan tool data list. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. Unusual brake pedal feel. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. 3 Basic Kinds of Valves in a Non-ABS System. d. Neither A nor B. a. ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. Who is correct? Write the correct spelling for Middle layer of skin. An often-misdiagnosed cause of pull is a collapsed brake hose. Who is right? Now I have loud grinding sounds coming from the front left tire. Consider a system consisting of both objects A and B. All of these might lead to a low brake pedal, EXCEPT: B only 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. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? 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). The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. Why is there a rear knocking noise from the drums when applying the brakes? Frank A5Brake Part A Hydraulic system - Chegg Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. b. Four-wheel alignment That bleeds out any vacuum. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. If the slide pins are your problem, they need to be cleaned and lubricated or replaced. I recommend having this area of the brakes inspected first. You could add shims, use a brake noise aerosol, or brake grease to the backs of the pads to dampen the noise. 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. This loss of stopping power occurs when heat reduces the friction needed between the drum and shoe linings. If this is what is going on, you need to identify and replace the faulty part. All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? ASE PRETEST QUIZLET Flashcards | Quizlet Technician B says backing off the castle nut will cause the bearing to overheat. 100100100 b. VAV_\text{A}VA and I2I_2I2? Brakes Dragging | The Causes of Brake Drag Explained Correct answer D-Both technicians are wrong because this is how power brakes are supposed to operate. A routine inspection would include all of the following EXCEPT. On a car with a drum/disc system, the front brakes lock up on light pedal application. Replace the hydrobooster. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? Which of the following can cause brake system dragging? The anchor pin never has to take all of the braking force when the brakes are applied, so its strength does not matter. The caliper piston needs to move back into its bore with no binding. Buying a new caliper may cost more but you will make up the cost with the time you save. Technician A says excessive rotor run out could be the cause. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. a. ABS Diagnostic Trouble Code set Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. 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. ASE identifies suspension both . If you do, it could be a matter of minutes until you smash into something. b. Proportioning valve In case these terms are new to you, real quick, I'll tell you that to stop the car, the master cylinder sends out fluid through tubes under pressure to drive a pincher (a caliper) that presses a pad or shoe against a metal disc (rotor) or drum. What Causes Brake Drag and How to Reduce It - Autos.com Question: The brakes on my new O4 Ford Explorer are dragging. 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. A. Residual valves are used to maintain constant pressure on the brake system. The brake pedal is firm when applied. d. Fluting. You can resurface the rotors if they are still thick enough. 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. How To: Diagnose and Fix Brake Drag - mpbrakes.com B only The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. Should I drive my car? c. Both A and B a. Spalling C. Dragging brakes If your whole car shakes when your brakes are applied, it could be just your rear brakes. c. Leakage past the master cylinder cups The other three answers can lead to a low brake pedal. Another possibility is that the pistons got bent, during a brake job or a car accident, and can't move freely anymore, causing the caliper to bind and limiting the amount of pressure to the pads. It will lead to increased tire wear. 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. Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. c. Both A and B A) Internal master cylinder leak B) Warped rotors C) Both A and B D) None of the above None of the above Who is correct? Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. On ABS vehicles, the ABS pump or the high-pressure accumulator can be the cause of power loss. Is it a caliper problem? What can cause this? A vehicle with 4-wheel disc brakes has a brake squeal. Brake fluid reservoir. Then, it should be backed off until there's a drag on the wheel. 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 brakes on quick take up systems use the same bleeding procedure as those without this valve. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. b. with the engine running You can pump the brakes before application to help offset this problem, but you need to get it fixed. 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. Correct answer D-Both technicians are wrong. d. Seized caliper piston. A car that pulls to one side can be annoying and also dangerous. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. The drum brake adjuster is located under an access cover in the back of the drum brake. Question: My car won't start unless I press really hard on the brakes. b. Second, it can act like a check valve. After that, fixing it is often easy with the help of your Haynes manual. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. Cause: Rear Wheel lockup or squatting has many causes. You can also verify it by looking at the direction on the scan tool data list. Assume the brakes are not applied. Question: What makes a car's disc brakes drag hard after a 15-minute drive? 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. 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. eCFR :: 49 CFR Part 396 -- Inspection, Repair, and Maintenance The consent submitted will only be used for data processing originating from this website. Using the screwdriver, gently pry out the rubber grommet that protects this access cover. Replace them if you see that they have oil, fluid or grease on them. A only Then, it needs to be backed off until the wheel begins to spin freely. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. Here are five of the most common brake problems I run into, starting with the most serious. 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). 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. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. Return Springs: Weak or broken return springs will result in brake drag. Abnormal noise. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. a. variable hours is outside the range 0 through 80. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Technician B believes it's caused by movement of the brake pad while breaking. An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. You have questions like: Will my brakes fail? Tech B says that the faster a vehicle moving, the more braking power is needed. d. A faulty power booster. A vehicle is equipped with a vacuum brake booster. Technician A believes that you must depress the quick take up valve. Is this possible? . Question: A year and a half ago (from 78,000 to 88,000 miles), I had the whole brake system replaced, i.e., pad, rotor, and lines. c. Both A and B What are possible causes? b. Wash in hot, soapy water and dry. The way to prevent these issues is to avoid driving in deep puddles, or areas where salt is used on the roads, but if that isn't an option, be sure to clean the wheels and underside of the car often in winter. b. 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. The other choices do not affect this concern. Beginner's Guide: What is ABS (and How Does It Work)? Who is right? Or it's possible your brake booster push rod is out of adjustment. A soft brake pedal is a MAJOR brake issue. Question: What if your car is going through brake fluid fast and your brakes don't want to work? Most modern brakes have rotors; older ones have drums, especially in the rear. Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. B. loosening the bleeder screw on the accumulator with the ignition switch on Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. D. Neither technician. A pull when braking may also have nothing to do with brakes. 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? c. Both A and B You also want to use OEM clips and anti-squeal shims. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. b. 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. Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. The other complaints wouldn't occur as a result. d. Neither A nor B. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. C. Both technicians Brake hydraulics are a sealed system, so there should not be air in the lines, but if after service you have a sponge pedal that is the most likely cause. Eventually, a sticking brake caliper will wear down the brake pads. Rear Brake Drag or Lockup - Drum Brakes - Phoenix Systems Excessive tire pressure The building pressure in the system results in brake drag and possible brake lockup. ABS causing brakes to stick | TDIClub Forums On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. This delay causes the spongy feel. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. 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. Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. 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. They can also cause you to use more fuel. Al+ClX2AlClX3. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. c. Parking brake out of adjustment d. Neither A nor B. 2023 The Arena Media Brands, LLC and respective content providers on this website. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. C. Both Technicians A only 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 d. Metering valve. 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 is wrong because excessive rotor runout will cause brake pulsations with no effect on wear. Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. The other situations wouldn't be caused by the lack of free play. 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. This leads to excessive pedal travel. Question: My rear inner pads wear down faster than the outer ones. However, it can also be due to fluid loss or a low fluid level. Erratic brake pulling occurs on a vehicle when the brakes are applied. ASE T-4 Brakes Flashcards - Cram.com Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. It will not be caused by lateral runout, which would cause brake chattering or pulsing. B only Who is correct? One of the first components to engage goes by the name of the push rod. A only This can be repaired by resurfacing or shims. Brake drag often occurs when the fluid in your system overheats. D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. On some vehicles, disc brakes are equipped with a steel scratcher that: Brake pad wear indicators may be either mechanical or: Which tool is used to measure the useful life of brake linings? The lens-maker's equation has three design parameters. A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. This article also includes a repair technique for noisy drum brakes that I found by trial and error. Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. C. pumping the brake pedal 25 times with the ignition switch off Can you help me understand where the problems are and what I should repair or replace? Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. b. Caliper piston seized A. If it is too worn, you must replace it. a. Technician B B. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. Question: My Chevrolet 2006 has some braking problems. The pictures below show the master cylinder under the brake pedal. The technician believes there is most likely an issue with the hydraulic system. Who is right? Technician B This drag happens with drum brake systems as the springs wear or become rusty. A better idea of where the master cylinder is located in relation to the brake pedal. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. a. Questions are welcome. Object A has mass mA=7kgm_{A}=7 \mathrm{kg}mA=7kg and initial momentum pA,i=17,5,0kgm/s,\vec{p}_{A, i}=\langle 17,-5,0\rangle \mathrm{kg} \cdot \mathrm{m} / \mathrm{s},pA,i=17,5,0kgm/s, just before it strikes object B, which has mass mB=11kg.m_{B}=11 \mathrm{kg}.mB=11kg. Brake adjustment B. Who is right? A routine inspection would include all of the following EXCEPT. d. Neither A nor B. a. Troubleshooting can seem like a mysterious black art only practiced by experienced,professional mechanics, when you don't know how certain systems in your car work. Technician B believes that the brakes can't be bled. Answer: It is most likely either a blockage in the line or a worn brake master cylinder. Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. You wouldnt pack your own parachute on your first jump, would you? If the coefficient of kinetic friction between the wheels and the pavement is k = 0.3, calculate the impulsive force on the wall if the brakes were applied during the crash.The brakes are applied to all four wheels so that all the wheels slip. You shouldn't waste your valuable time trying to rebuild it. B only b. Correct answer C-New brake rotors don't need to be refinished. The wheel cylinder is attached to the ________. Who is correct? This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. d. Air in hydraulic system. Replace the defective part. c. Both A and B a. Technician A What's up with that? 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. 7 Symptoms of a Brake Caliper Sticking (and Common Causes) Answer A is correct. b. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. c. Both A and B B only Regardless, I recommend having a thorough brake inspection by an experienced mechanic. 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 4-wheel disc brakes on a vehicle are causing brake squeal. A only On ABS systems that have a high-pressure accumulator, this is depressurized by: 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. You should clean or replace the adjusters to eliminate the problem. C. Brake adjustment 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. Who is correct? You may lose your brakes if you run out of travel before they are fully applied. Loose wheel bearing If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. That's why the power assist begins to function properly after the engine runs. All of these would cause a low brake pedal, EXCEPT: Chevy Brake Problems: Common Issues and How to Fix Them Brake fluid expands as brake fluid temperature rises from normal braking. a. Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. 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. The plugged compensator port leads to dragging brakes instead. A low brake pedal can also be due to a fluid leak or worn brake linings. How to Adjust Drum Brakes | YourMechanic Advice Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. Answer: The brake fluid temperature rising and pressure building in the brake system. Which is the correct way to service these brakes? 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.