The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. 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). What do you think it might be? The master cylinder seems to be okay. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. Can you help me understand where the problems are and what I should repair or replace? The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. 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. 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. 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. They will need to be resurfaced. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Consider a system consisting of both objects A and B. After the collision, object A is observed to have final momentum pA,f=13,3,0kgm/s.\vec{p}_{A, f}=\langle 13,3,0\rangle \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}.pA,f=13,3,0kgm/s. 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). Technician B 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. B only There are four types of brake fade. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. If you get no assist, you need a new check valve. Question: My rear inner pads wear down faster than the outer ones. Troubleshooting A Hard Brake Pedal | Classic Car Restoration Club A only The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Tech B states that this function can also be carried out by the driver in manual mode. Bad front tires, or broken belts in a front tire, could cause it. Technician B says the brakes on this vehicle cannot be bled. If you see the Brake Warning Light illuminated, it is probably a leak. d. Neither A nor B. Brake Proportioning Valve Problems - In The Garage with CarParts.com ASE identifies suspension both . Been there, done that! C. Both technicians Slight scoring or heat spots Answer: There are a few options to look at here. c. VAV_\text{A}VA and ITI_\text{T}IT? To fix this problem you will need to replace the caliper. Who is correct? This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. Sinking Pedal: You may notice this while sitting at a stop light. This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. Step 2: Adjust the star wheel. Technician B believes that the brakes can't be bled. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. Which of the following can cause brake system dragging? Binding Pins B. Sticking piston C. Binding caliper D. Worn break pads . An often-misdiagnosed cause of pull is a collapsed brake hose. b. Correct answer B-The short push rod length has to travel farther to make contact. B. Brake drum machined beyond its limit Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. Other times it is fine. Electric Vehicle Research Paper Answer A is correct. 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. The brakes can fail if your hydraulic system or master cylinder is leaking. Any pull caused by unevenly worn tires will be amplified when you step on the brakes. Correct answer B-Having a seized caliper piston leads to a high pedal. A brake hose problem like this can take two forms. B. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. 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. Technician A Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. Who is right? ASE PRETEST QUIZLET Flashcards | Quizlet 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. Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Excessive brake drag d. Metering valve. c. Both A and B Question: Sometimes when I apply the brakes, the pedal of my SUV goes very low before stopping completely. However, it can also be due to fluid loss or a low fluid level. A better idea of where the master cylinder is located in relation to the brake pedal. They are not compensating for normal lining wear. A only c. Both A and B The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. Technician B says backing off the castle nut will cause the bearing to overheat. Ok, im starting a new thread because the problem is not an alignment problem anymore. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. 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 ASE A4 Practice Test. A car that pulls to one side can be annoying and also dangerous. Check your brake hoses for anomalies. Technician B is wrong because a faulty residual check valve if used will cause a spongy pedal due to the ingress of air. Why is this enzyme likely to include a side chain such as Ser in its active site? ASE A4 Practice Test (Updated 2023) | Chapter 38 Test.docx - 5 / 5 Replacing sealed wheel bearing You can resurface the rotors if they are still thick enough. Manage Settings Which is the correct way to service these brakes? They can also cause you to use more fuel. 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 ABS causing brakes to stick | TDIClub Forums 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. In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. Question: What causes a brake pedal to depress all the way to the floor in a car? It can also be a vacuum hose leak to the booster, or it can be a booster that is defective. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. Who is correct? Continue scrolling to learn more about these common issues and their solutions. 7 Symptoms of a Brake Caliper Sticking (and Common Causes) Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. Who is right? If it is, you should be able see the fluid on the carpet under your dash, just over your brake pedal. Technician A says the yaw rate and deceleration sensor should be recalibrated. This can be repaired by resurfacing or shims. A clogged fluid return hole in the master cylinder can cause all four wheels to drag, because the fluid sent to the wheels when you press the pedal can't return and let the pressure off. Here are five of the most common brake problems I run into, starting with the most serious. The ABS warning light usually comes on when there is this type of problem. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. B. One way to test your rear drum brakes is to apply the parking brake slightly while driving, because the parking brake uses the drum brakes in the rear. Even with proper maintenance, you may find yourself with an unexpected brake problem -- here are some of the most common examples. How To: Diagnose and Fix Brake Drag - mpbrakes.com D. The star adjuster should be adjusted until the shoes hold the wheel in place firmly. c. Both A and B 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. Who is right? This also reduces braking power. ASE T-4 Brakes Flashcards - Cram.com What can cause this? The vehicle pulls to the side under heavy braking You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. Question: The brakes on my new O4 Ford Explorer are dragging. If the vehicle has low or uneven tire pressure, there might be a pull. Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled. It's a vital component in your car; leave it to the pros. Who is right? Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Use the lens-maker's equation to design three different thin diverging lenses, each having a focal length of 27.0cm27.0 \mathrm{~cm}27.0cm and each made from glass that has an index of refraction of 1.601.601.60. The brakes on quick take up systems use the exact bleeding procedure as systems without the valve. The other major way brakes act up is when they fail to disengage completely in one way or another. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. The steering wheel vibrates all the time and always veers to the left. A. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. 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. The other situations wouldn't be caused by the lack of free play. The other complaints wouldn't occur as a result. Answer: You have a rear knocking noise from the drums because your shoes are being pulled away from the backing plate and snapped back into place by the spring clips. Correct answer A-the biggest downside of drum brakes is their susceptibility to fading. If there is plenty of fluid in evidence, check if it is hot; repeated hard use, towing, descending a steep hill, or a dragging calipercan boil the fluid. This leads to the brakes dragging. If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. 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! 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. 8. a. B. The system reverts to regular brake operation without ABS. 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. b. What could be the cause of the problem? 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. 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. C. Both Technicians 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, where it attaches to the brake pedal. Technician A says the quick take up valve must be depressed. B only Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Why is this? Check your pads for any type of contamination. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. 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. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. c. Both A and B A only d. Neither A nor B. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. This leads to excessive pedal travel. The pictures below show the master cylinder under the brake pedal. You will find the booster between the master cylinder and the firewall in your engine compartment. It's also possible to check the blink codes with the DLC. 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. Are they safe? Technician A is wrong because recalibration is not required for these sensors. Assume the brakes are not applied. The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. Sketch each of your designs. Braking: Car Pulls to One Side - Tomorrows Technician variable hours is outside the range 0 through 80. If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. Copper corrodes easily which makes it a poor option. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. 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. This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. 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. Which of the following conditions can cause brake pedal fade? The steering wheel vibrates all the time and always veers to the left. Brake rotors need to be refinished under all of these conditions EXCEPT: Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. Always replace components with genuine GM parts to avoid premature failure of brake system components. 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. Question: Will a bad master cylinder cause the calipers to stick? If you do, it could be a matter of minutes until you smash into something. 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. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. b. Caliper piston seized The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Another uncommon cause of a soft pedal and long travel, is a bad wheel bearing, which is unrelated to the brakes except for being in the vicinity of the rotors. 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. brakes midterm Flashcards - Cram.com Loose wheel bearing Five Common Brake Problems in Cars - AxleAddict The star adjuster should be adjusted one full turn to back the shoes away from the drum. All of these could cause this problem EXCEPT: Correct answer D-Excessive tire pressure isn't going to cause the erratic pulling. The brakes on your car are probably the most important system, and due to the difficult job they do and how often they are used, they are also one of the most likely to wear and need service. a. That bleeds out any vacuum. 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.

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