Brake Squeal:A vibration between the pads and the calipers or the pads and the rotors can cause them to squeal. Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled. Al+ClX2AlClX3. b. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Which of the following is the proper procedure? A only a. a. Continue scrolling to learn more about these common issues and their solutions. A. The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. Correct answer A-You torque an adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. A power assist brake booster push rod that is to short will cause which of the following? 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. A. You may feel your Chevy jerk when you brake. Can I drive my car? 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. initial cost They will need to be resurfaced. a. with the engine off Replace the brake linings Technician A believes that you must depress the quick take up valve. Tech A states that in the Traction Control System, the control unit can independently apply individual brake units even though the driver is not stepping down on the brake pedal. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. The wheel cylinder is attached to the ________. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. d. Neither A nor B. Step 2: Adjust the star wheel. The power booster uses engine vacuum to assist your leg when applying the brakes, and is nearly universal in modern cars. Questions are welcome. b. Wash in hot, soapy water and dry. A only 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. 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. 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 sliding and moving parts of the brake system require lubrication to prevent them from binding. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. d. A faulty power booster. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. It also expands when subjected to high pressures. D. Noticeable brake pulsation. Correct answer D-Both technicians are wrong. Answer A is correct. b. If you don't know what to look for, have a mechanic who knows what they are doing and are reputable to inspect the brakes. b. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. Who is correct? It will lead to increased tire wear. b. with the engine running 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. Brake problems can be daunting if you don't know what's causing them. Air in the hydraulic system Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. Which of the following can cause brake pedal pulsation? Frank A5Brake Part A Hydraulic system - Chegg C. Installation of a new brake rotor Technician B says that the star wheel assembly should be lubricated on the floating end. Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. If you get no assist, you need a new check valve. Who is right? The brakes of large trucks are different. Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. You have questions like: Will my brakes fail? Technician A is working on a vehicle that was brought in with excessive brake pedal travel. This delay causes the spongy feel. A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. d. Brake light is illuminated. Why is this? 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? For drum brakes, a 10 lb. Brake pads are being replaced on a vehicle with four-wheel disc brakes. Wearing your pads down to the metal baking plates will also result in a very "wooden" brake pedal as well, as there is not as much friction when it is metal on metal, and they have to clamp harder to slow you down; the horrible grinding noise is usually an indication before the hard pedal. d. Fluting. Symptoms of a Bad or Failing Brake Hose | YourMechanic Advice which of the following can cause brake system dragging Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. a. The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. What is the most likely reason? Check your pads for any type of contamination. Who is correct? The first thing you should do is check your brake fluidlook in your owner's manual to see how. The vehicle pulls to the side under heavy braking A car that pulls to one side can be annoying and also dangerous. 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. Brakes, when applied must not disrupt steering geometry. B. Technician A is wrong because recalibration is not required for these sensors. 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 B This valve basically allows the rear drums to apply first in the system. They need to be replaced at once. 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. This leads to the brakes dragging. Unusual brake pedal feel. Rotors should be refinished when there is scoring, heat spots, lateral runout, pedal pulsations or thickness variation. B only The lens-maker's equation has three design parameters. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. This also reduces braking power. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. To further reduce the noise, do not machine the rotor more than needed. Vacuum Pressure Vacuum - or really lack of vacuum pressure - is the most common cause of a hard brake pedal, and therefore the first thing to look at when a hard pedal is present. B only B. Brake pad friction materials may be manufactured from any of the following EXCEPT: makes a noise if the brake pads are due to be replaced. Answer: It all depends on where you got hit, where the emergency brake is located and if you have electronic emergency brakes. This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. 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. If it needs to be done, the fluid can be removed after the lines are capped. Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake system. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. c. Seized caliper piston on the other side Who is right? Correct answer C-Both technicians are correct. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. Then you want to back it off until the wheel starts to spin freely. Correct answer C-New brake rotors don't need to be refinished. B only Thus, there are many ways to design a lens that has a particular focal length in air. 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. Brake drag is caused by the brake pads or shoes not releasing completely when the brake pedal is released. c. Defective metering valve. Who is right? You also want to use OEM clips and anti-squeal shims. The ABS warning light usually comes on when there is this type of problem. Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. C. Dragging brakes After a master cylinders replaced and the brake system is bled what must happen? On ABS systems that have a high-pressure accumulator, this is depressurized by: B. Seldom does this result in a car that won't move at all, but driving with the brakes dragging is unsafe and will result in even more damage in a short amount of time if not repaired. Who is correct? The three most common brake noises I encounter every day when talking to customers are a grinding sound, a thumping from the rear, and a squeak. A properly working booster will make it easier to hold the pedal and may even slightly depress the pedal by itself. 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. Which is the correct way to service these brakes? Regardless, I recommend having a thorough brake inspection by an experienced mechanic. The brake pedal is firm when applied. a. Five Common Brake Problems in Cars - AxleAddict If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. 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). As a rule of thumb, shaking caused by a problem in the front end of the car will be felt in the steering wheel, while shaking in the rear will seem to affect the whole car. C. Brake adjustment You could also have a ballooning brake hose when the brakes are applied. Question: What if your car is going through brake fluid fast and your brakes don't want to work? Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? A only Any pull caused by unevenly worn tires will be amplified when you step on the brakes. The dragging sound could be caused by the brake drum not fully releasing when the brake is released. What could be the issue? 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. Replace the hydrobooster. b. Continue with Recommended Cookies. Technician B is wrong because backing off the castle nut will not cause the bearing to overheat. Opening or loosening any part of the hydraulic system is dangerous because of the fluid pressure. Brake Chatter: Warped or improperly finished rotors will cause this noise. 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. I changed the brake pads, but that didn't help much. A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. You need a scan tool to read the code. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. Now I have loud grinding sounds coming from the front left tire. I replaced master cylinder already. The steering wheel vibrates all the time and always veers to the left. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Who is right? Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. B. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. Beginner's Guide: What is ABS (and How Does It Work)? 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. auto tech review 3 Flashcards | Quizlet Technician B says insufficient clearance between the pads and caliper slider could be the cause. There are four types of brake fade. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. The master cylinder seems to be okay. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. During brake application pressure is high enough to bypass the kink, but when the brake pedal is released, the spring pressure of the master cylinder is not sufficient for the pressure to bypass the kink. Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. An often-misdiagnosed cause of pull is a collapsed brake hose. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. Step 1: Access the drum brake adjustment star wheel. a. b. measure the pad-to-caliper piston clearance. Answer: The grinding sound may be something caught between the backing plate and rotor. What's more, I'll teach you to fix it in either case. Low Brake Pedal:This can occur if the rear drum brake shoe adjusters happen to be rusted or sticking. Excessive tire pressure Question: I have a 99 Honda Civic EX. a. d. Neither A nor B. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? You notice brake fluid in the engine. The plugged compensator port leads to dragging brakes instead. d. Metering valve. brakes midterm Flashcards - Cram.com variable hours is outside the range 0 through 80. 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? Technician A says a defective proportioning valve could be the cause. Glazed brake pads result from excessive heat. The wheel cylinder is attached to the ________. 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. Electric Vehicle Research Paper b. b. To reduce this, the mating surfaces need to be cleaned and lubricated. Which of the following conditions can cause brake pedal fade? B only A better idea of where the master cylinder is located in relation to the brake pedal. 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. Brake Problems Caused By Fluid Contamination We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. The consent submitted will only be used for data processing originating from this website. Troubleshooting: Common Brake Issues and Causes d. Repair leak and replace brake linings. All of the following can cause brake system dragging, EXCEPT: Which of the following frictional brake systems is used on vehicles today? Is this possible? This article is accurate and true to the best of the authors knowledge. Answer: There are a few options to look at here. It will also have a fault code related to the loss of boost. 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. c. Both A and B Bad Brake Caliper Symptoms: 7 Signs to Watch Out For d. while driving the vehicle slowly. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. b. Caliper piston seized When you make the final adjustments to the drum brakes: However, it can also be due to fluid loss or a low fluid level. D. Low brake fluid. Braking: Car Pulls to One Side - Tomorrows Technician A bad master cylinder can introduce air into the lines, as can a failure at a caliper or wheel cylinder. d. Neither A nor B. Answer: Yes, brake pads can cause problems for brakes on a car. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. 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 Question: My Chevrolet 2006 has some braking problems. In a brake system with disc front and drum rear, there is a valve in the system known as a metering valve or hold-off valve. a. Question: My Chevrolet 2006 has some braking problems. \mathrm{m} / \mathrm{s}.pB,i=4,6,0kg.m/s. c. Both A and B Hard Pedal: You may have a loss of power assist because the engine vacuum is low. Correct answer C-Both techs are correct. Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. d. Neither A nor B. D. Neither technician. Brake fluid expands as brake fluid temperature rises from normal braking. 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 Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. 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. 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. c. Both A and B My Car Sounds Like Something Is Dragging, But Nothing Bleed the brake lines as recommended by Chevy to fix this. 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. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? 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. I replaced the brake pads again, both calipers and rotors. C. pumping the brake pedal 25 times with the ignition switch off Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. A. It can also be a vacuum hose leak to the booster, or it can be a booster that is defective. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. The pictures below show the master cylinder under the brake pedal. A only A. 2320, what is the phase relationship between What can cause this? All of these might lead to a low brake pedal, EXCEPT: The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. b. a. One of the first components to engage goes by the name of the push rod. This article also includes a repair technique for noisy drum brakes that I found by trial and error. Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. Failure of lateral runout or thickness variation checks 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. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. A. A routine inspection would include all of the following EXCEPT. A. The air cleaner also can't cause a brake fluid leak. An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Excessive brake drag ASE A5 Brakes Flashcards | Chegg.com All modern cars come with sophisticated antilock braking systems (ABS) and brake based stability control, which complicates some aspects of troubleshooting and repair, but those systems will inform you when there is a problem and default to the old, simple system. Why is there a rear knocking noise from the drums when applying the brakes? If the vehicle has low or uneven tire pressure, there might be a pull. Light trucks and vans were mandated to be equipped with center high mount stop lamps in: A regenerative braking system uses_____to slow the vehicle during braking. B. Assume the brakes are not applied. 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. Technician A says to check the TCS and ABS diagnostic trouble codes. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. 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. A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. Technician A is wrong because excessive rotor runout will cause brake pulsations with no effect on wear. D. Neither technician. How To: Diagnose and Fix Brake Drag - mpbrakes.com
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