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. A restricted disc brake caliper hose might cause all of these EXCEPT: At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. A. The wheel cylinder is attached to the ________. Why is this? Who is correct? Step 2: Adjust the star wheel. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. You may feel your Chevy jerk when you brake. Question: I have a 99 Honda Civic EX. Who is correct? Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. Brakes that Drag: Dragging brakes cause the brakes to wear out faster, and they can cause steering pull and tire wear. The other three answers wouldn't cause the same issues. c. Clean with approved cleaner and reuse The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. C. Both technicians A only Then, it should be backed off until there's a drag on the wheel. Erratic brake pulling occurs on a vehicle when the brakes are applied. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. 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 The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. Here are the top causes of a brake caliper sticking. 3 Hydraulics-Related Sources of Brake Drag Technician A says the master cylinder pushrod adjustment is incorrect. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. 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. C. Both technicians Who is right? Disc Brake System Flashcards | Quizlet Technician A That way, if there is a leak in one part of the system, it should only affect one front brake and one rear brake. If this is your problem, then the fix is to resurface the rear drums or replace them. Questions are welcome. 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. 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. 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. There are four types of brake fade. which of the following can cause brake system dragging 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. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. a. Or it's possible your brake booster push rod is out of adjustment. Any brake booster (whether from Master Power or any other supplier) needs a vacuum source to operate. All the other answers could occur. A only Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Hard Pedal: You may have a loss of power assist because the engine vacuum is low. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. They will need to be resurfaced. Any pull caused by unevenly worn tires will be amplified when you step on the brakes. b. Is this possible? In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. Technician A is wrong because the proportioning valve only affects brake lockup and is not used on 4-wheel disc brakes only on disc/drum combinations. 2. c. Defective metering valve. Should I drive my car? Loose wheel bearing You will find the booster between the master cylinder and the firewall in your engine compartment. 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 drum or rotor that has deep scores in it will cause the brakes to grab. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. A routine inspection would include all of the following EXCEPT. 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. Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} Who is right? You don't need to do anything different. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. What is this type of bearing failure called? The other three answers can lead to a low brake pedal. Technician A Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. a. 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. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. I replaced master cylinder already. There are many possible causes of this shaking, including the front rotors being warped, hot spots (slight irregularities) on your rotors caused by excessive heat, or pad impressions. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. a. This drag happens with drum brake systems as the springs wear or become rusty. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. a. Consider a system consisting of both objects A and B. d. Neither A nor 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. Brake Noises: What Causes Them and How to Fix Them. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. d. Neither A nor B. To reduce this, the mating surfaces need to be cleaned and lubricated. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. The vehicle pulls to the side under heavy braking An often-misdiagnosed cause of pull is a collapsed brake hose. Again, you will have to measure the drums to determine if they can be resurfaced or not. A only It's also possible to check the blink codes with the DLC. b. b. The air cleaner also can't cause a brake fluid leak. Who is right? 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. c. Both A and B This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. 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. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. Answer: Most likely your caliper is defective, if it were the master it would most likely be more then one brake caliper sticking. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. The ABS warning light usually comes on when there is this type of problem. Can I drive my car? Who is correct? Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. Which of the following can cause brake system dragging? eCFR :: 49 CFR Part 396 -- Inspection, Repair, and Maintenance I've included some pictures and FAQs. measure the pad-to-caliper piston clearance. Who is right? A) Internal master cylinder leak B) Warped rotors C) Both A and B D) None of the above None of the above A only c. with the vacuum hoses removed Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Next, hold your foot to the pedal while starting the engine. Answer: The most likely cause is a caliper sticking, either it's the piston or slide pins. C. Dragging brakes Question: What makes a car's disc brakes drag hard after a 15-minute drive? 8. 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? auto tech review 3 Flashcards | Quizlet Braking: Car Pulls to One Side - Tomorrows Technician Question: Only one wheel brakes on my 2000 Acura. Continue scrolling to learn more about these common issues and their solutions. B only If you get no assist, you need a new check valve. Correct answer B-The short push rod length has to travel farther to make contact. 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. A. A drum or rotor that has deep scores in it will cause the brakes to grab. The drum brake adjuster is located under an access cover in the back of the drum brake. 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. D. Neither Technician. They are not compensating for normal lining wear. Question: I just had brakes and rotors done two months ago on my vehicle. Find out what these noises mean and what might fix them. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. A. A brake hose problem like this can take two forms. A. The other situations wouldn't be caused by the lack of free play. A) Warped rotors B) anti-lock braking system operation C) Both A and B D) None of the above Both A and B Which of the following can cause brake system dragging? Answer: The grinding sound may be something caught between the backing plate and rotor. Technician A says the quick take up valve must be depressed. 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. You can resurface the rotors if they are still thick enough. All of these would cause a low brake pedal, EXCEPT: A. The system reverts to regular brake operation without ABS. Seized wheel cylinder piston Bad front tires, or broken belts in a front tire, could cause it. The pictures below show the master cylinder under the brake pedal. Who is correct? 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. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Manage Settings That's why the power assist begins to function properly after the engine runs. A only This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? B only Eventually, a sticking brake caliper will wear down the brake pads. 4-wheel disc brakes on a vehicle are causing brake squeal. The plugged compensator port leads to dragging brakes instead. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . If the slide pins are your problem, they need to be cleaned and lubricated or replaced. The building pressure in the system results in brake drag and possible brake lockup. A spongy brake pedal may be caused by: 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). With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. auto tech review 3 Flashcards | Quizlet D. Low brake fluid. 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. b. 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. 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. Question: Does an emergency brake in a car not work after an accident? a. Answer: There are a few options to look at here. Tips and precautions to use when replacing your brake pads, so you can get quality results on a Honda or any other vehicle. 505050 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. It's worth grabbing a flashlight and looking to see whether the master cylinder is leaking visibly. 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. Al+ClX2AlClX3. Which of the following can cause brake system dragging? C. The star adjuster should be adjusted until a slight drag on the wheel occurs. The sliding and moving parts of the brake system require lubrication to prevent them from binding. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? What are possible causes? HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. 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. d-Neither A or B Both A and B All of the following can cause brake system dragging, EXCEPT: a-stuck caliper piston b-misadjusted master cylinder pushrod length c-restricted brake line or hose d-internal master cylinder leak Internal master cylinder leak Which of the following frictional brake systems is used on vehicles today? 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. Tech B says that the faster a vehicle moving, the more braking power is needed. A slow descent of the brake pedal means that the pressure is leaking out of the master cylinder. ASE A4 Practice Test. Correct answer D-Both of these techs are wrong. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. Failure of lateral runout or thickness variation checks What's more, I'll teach you to fix it in either case. The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. 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. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. d. Neither A nor B. Tech B states that this function can also be carried out by the driver in manual mode. I changed the brake pads, but that didn't help much. A only c. Both A and B The technician believes there is most likely an issue with the hydraulic system. Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. Technician A After that, fixing it is often easy with the help of your Haynes manual. 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. Checking the diagnostic trouble codes is possible. While starting the engine with the brakes applied, the pedal does not go down slightly. To determine if your rear brakes are the problem, you need to test them in isolation. Brakes Flashcards | Quizlet 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. Who is right? Question: What if your car is going through brake fluid fast and your brakes don't want to work? The other choices will not do this. d. Neither A nor B. b. Proportioning valve C. Both technicians Additionally, brake dragging can also be caused by frozen emergency brake cables as well as overextended self-adjusters. Which of the following is the proper procedure? 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. Excessive tire pressure Hydro boost locking up breaks | Diesel Place Technician B says that the star wheel assembly should be lubricated on the floating end. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. a. It sounds to me like some components aren't moving freely and are getting stuck causing the pulling and noises. 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. 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 caliper piston needs to move back into its bore with no binding. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. b. Wash in hot, soapy water and dry. 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. a. ABS Diagnostic Trouble Code set c. Both A and B How To Determine Cause of Brake Drag. Why is this enzyme likely to include a side chain such as Ser in its active site? a. The same factors can cause cable operated parking brakes to jam up as well, requiring a replacement of the parking brake cable. B. C. Installation of a new brake rotor This can be repaired by resurfacing or shims. 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. Sinking Pedal: You may notice this while sitting at a stop light. This heat can be caused by a dragging brake unit. B. Which technician is most likely correct? b. Caliper piston seized 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. 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. Then you should try the brakes. A. pumping the brake pedal 10 times with the ignition switch on 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. My Car Sounds Like Something Is Dragging, But Nothing Technician A says the cause could be a leaking power brake booster diaphragm. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc.