A. Seized caliper piston It will lead to increased tire wear. Why are X-rays, gamma rays, and fast-moving electrically charged particles potentially harmful to our bodies? A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following? b. Four-wheel alignment tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. Who is right? Contact. A only Replace them if you see that they have oil, fluid or grease on them. The first thing to check with any brake issue is the fluid level and condition in the master cylinder reservoir. 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. I highly recommend having your car towed; this is a very dangerous situation, and the problem needs to be fixed before the car is driven. D. Low brake fluid. Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? c. Replacing a ball joint Ok, im starting a new thread because the problem is not an alignment problem anymore. 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. . It also expands when subjected to high pressures. Personal Injury Attorney With Truck Accidents They following are three of them. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. 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. Correct answer A-Excessive tire pressure is the exception because this fault will cause tire wear but not a pull. Here are the top causes of a brake caliper sticking. 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. That bleeds out any vacuum. B. The only fix I recommend for a faulty master cylinder is to replace it with a new one. Fluid will not run from the master cylinder while you remove it. D. Brake pedal pulsation. Correct answer C-Both technicians are correct. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. Question: Will a bad master cylinder cause the calipers to stick? Turn the star-shaped adjuster a few times. Which of the following can cause brake system dragging? D. Neither technician. Question: My car won't start unless I press really hard on the brakes. You can verify the wheel speed sensor operation while comparing the four-wheel outputs to the data list. This can be repaired by resurfacing or shims. b. The other situations wouldn't be caused by the lack of free play. When the brakes are applied, brake fluid is pumped from the master cylinder to the calipers in order to expand the caliper piston and slow the vehicle. Who is right? Any pull caused by unevenly worn tires will be amplified when you step on the brakes. It can also be due to a corroded or jammed caliper piston or a caliper that has corroded bushings or mounting pins. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. C. Installation of a new brake rotor Sinking Pedal: You may notice this while sitting at a stop light. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 1. D. 400400400. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. This delay causes the spongy feel. 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. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. Then, it needs to be backed off until the wheel begins to spin freely. Other times it is fine. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. Who is correct? The mechanic is now telling me I need all of those parts replace again. For drum brakes, a 10 lb. Which of the following conditions can cause brake pedal fade? It's possible that a blocked brake caliper or brake drum is to blame for that dragging sound your automobile is making. Step 2: Adjust the star wheel. d. Neither A nor B. 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. C. Both technicians a. 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? 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. You'll need to remove the caliper and inspect all moving parts to diagnose the problem. Why is there a rear knocking noise from the drums when applying the brakes? A possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. Brake drag often occurs when the fluid in your system overheats. 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. The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. 505050 Technician A says to check the TCS and ABS diagnostic trouble codes. a. Spalling The four noises that car owners complain about most often: CV joint noise, water pump noise, belt noise, and heat shield noise. The brakes can fail if your hydraulic system or master cylinder is leaking. 2023 The Arena Media Brands, LLC and respective content providers on this website. Answer: There are quite a few possibilities for this problem. D. Neither technician. This also reduces braking power. A. 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 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. 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. a. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. 8. Technician A says excessive rotor run out could be the cause. Brake pads are being replaced on a vehicle with four-wheel disc brakes. d. Neither A nor B. This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. C. 200200200 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. 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 you are trying to bring a project car back to life, but can't get it to roll, chances are this is the problem. You need a scan tool to read the code. Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. 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. B only It will need replacement or resurfacing. Technician B says insufficient clearance between the pads and caliper slider could be the cause. Low or uneven tire pressure can cause a pull. You also want to use OEM clips and anti-squeal shims. 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. While starting the engine with the brakes applied, the pedal does not go down slightly. Question: The brakes on my new O4 Ford Explorer are dragging. d. Repacking a front wheel bearing, Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. 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. Question: My Chevrolet 2006 has some braking problems. 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 This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Even when everything is working properly with your brakes, and nothing is worn out, they can suddenly start making disconcerting noises or develop a shudder under use. What can cause this? 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. 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. Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. This heat can be caused by a dragging brake unit. . Question: My car has power brakes and used to stop on a dime. B. B only Always use OEM recommended clips and anti-squeal shims. c. Both A and B Loose wheel bearing Brake hoses twist while replacing the caliper after a brake job resulting in brake drag at that unit. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. If the vehicle has low or uneven tire pressure, there might be a pull. 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. a. 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. a. After that, fixing it is often easy with the help of your Haynes manual. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. The lens-maker's equation has three design parameters. Technician A Answer: Yes, brake pads can cause problems for brakes on a car. Answer: This means that you have a leak in the system and you most likely have air in the brake lines. How to Replace Honda Brake Pads: Tips and Precautions. Hard Pedal: You may have a loss of power assist because the engine vacuum is low. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. a. b. 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? Assume the brakes are not applied. Technician B b. The correct answer is C. Of the choices given, only an out-of-round brake drum can cause pulsation in a hydraulic brake system. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. All of these might lead to a low brake pedal, EXCEPT: Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. b. Question: I have a 99 Honda Civic EX. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. Brake Chatter: Warped or improperly finished rotors will cause this noise. Why is this? You can resurface the rotors if they are still thick enough. The steering wheel vibrates all the time and always veers to the left. This drag happens with drum brake systems as the springs wear or become rusty. 7. Technician B says backing off the castle nut will cause the bearing to overheat. a. How To Determine Cause of Brake Drag. Technician B Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. A. C. Both Technicians Hard Pedal- It takes much more pressure to get the same amount of pedal travel and braking force. Loose wheel bearing A only The ABS light doesn't go off after the engine starts. 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. 100100100 If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. 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 brake pulsation can be fixed very easily by having your rotors resurfaced (which is cheaper) or replaced (more expensive). Beginner's Guide: What is ABS (and How Does It Work)? Consider a system consisting of both objects A and B. Steering wheel shakes when brakes are applied. I replaced master cylinder already. Technician B believes that the brakes can't be bled. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. What is the cause? Who is right? 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 problems can be daunting if you don't know what's causing them. When the brake pedal gets soft or sinks to the floor, it's generally due to a leak in the braking system, most commonly the master cylinder leaking internally or externally. 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.. A routine inspection would include all of the following EXCEPT. What could be the cause of the problem? Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. The enzyme phosphoglucomutase interconverts glucose-111-phosphate and glucose-666-phosphate. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. A. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. This article also includes a repair technique for noisy drum brakes that I found by trial and error. Air and vaporized fluid are compressible and, if allowed into a hydraulic brake system, the brake pedal will feel spongy and the force transmitted to the lining will be reduced. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. Who is correct? Correct answer D-The leak must be repaired before the linings are replaced. As a result, the car may exhibit a dragging sensation, since the brakes at the affected wheel are applied (or partially applied) at all times. b. The vacuum booster can be checked by pumping the pedal a few times while the engine is off. Is this possible? 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. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. Lubricate slide pins on disc brakes to prevent brake drag and binding. B only Brake Pull: Uneven braking means that you have one front brake on your Chevy that is not operating properly. Al+ClX2AlClX3. Is this a caliper or could it be a blockage in the brake hose? The steering wheel vibrates all the time and always veers to the left. d. Steering gear problem. Technician B says air trapped in the hydraulic system could be the cause. Technician A says to verify the wheel speed sensor operation and compare all four wheel speed sensor outputs to the data list. Continue with Recommended Cookies. In Fig. 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. Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. A restricted disc brake caliper hose might cause all of these EXCEPT: The master cylinder, where it attaches to the brake pedal. If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. Soft Pedal- The brake pedal is easy to push but there is less braking. You should put new pads on your Chevy and replace or repair the rotors. All of these would cause a low brake pedal, EXCEPT: They can also cause you to use more fuel. If you see the Brake Warning Light illuminated, it is probably a leak. The other brake pad is slightly worn. However, it can also be due to fluid loss or a low fluid level. 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). Correct answer C-Both techs are correct. Which technician is most likely correct? D. Neither Technician. Brakes on an older vehicle with a quick take up valve in the master cylinder are being bled.

What Kind Of Cello Does Hauser Play, Arkansas Highway Department Construction Plans, Schnucks Alcohol Sales Hours, What Happened To Jim Tom On Moonshiners, What Animals Pass The Mirror Test, Articles W