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. 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.. c. Both A and B Who is right? Brake rotors need to be refinished under all of these conditions EXCEPT: 8. All of the following items could cause this erratic pull EXCEPT: Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. I recommend having this area of the brakes inspected first. B only Push and hold the release button on the end of the emergency brake handle; this is so the emergency brake does not lock into place and can be released easily. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. The brakes of large trucks are different. Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. 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. There are different causes for brake drag. That way, if there is a leak in one part of the system, it should only affect one front brake and one rear brake. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Dragging brakes must be repaired because it results in overheated parts and possible damage to the brake system. Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. The master cylinder actually contains two pistons and seals, which in simpler systems controlled the front and back brakes separately, or the diagonally opposite wheels, so at worse you would only lose half your brakes. There is also typically a separate, mechanical parking/emergency brake, either cable or electrically operated, that works only on the rear wheels. b. with the engine running This braking problem can be caused by several different things, even the tires (see below), but the most common cause is a frozen caliper. . A drum or rotor that has deep scores in it will cause the brakes to grab. Correct answer D-Both technicians are wrong because the problem is in the power booster. Consider a system consisting of both objects A and B. c. Both A and B 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? Technician A The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. The other three answers can lead to a low brake pedal. After a master cylinders replaced and the brake system is bled what must happen? It does this through a small sliding valve operating on spring pressure. Brake drag often occurs when the fluid in your system overheats. I changed the brake pads, but that didn't help much. The brake pedal is firm when applied. Or it's possible your brake booster push rod is out of adjustment. In Fig. Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. You will find the booster between the master cylinder and the firewall in your engine compartment. Which of the following can cause brake system dragging? d. Neither A nor B. All the other answers could occur. Pulsation results from something loose in the system or by an unparallel rotor. 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. You also want to use OEM clips and anti-squeal shims. 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. Any noises coming from your car may result in you ignoring the indicators. D. Brake pedal pulsation. B only a. If you see the Brake Warning Light illuminated, it is probably a leak. You could try having a fine cut done to the brake shoe surface of the drums and lightly sand them after the cut, or replace the drums. d. Neither A nor B, The front wheel bearings are being adjusted. 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. B only d. Fluting. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. These records must include: (1) An identification of the vehicle including company number, if so marked, make, serial number, year, and tire size. 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. 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? Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. d. Metering valve. d. Neither A nor B. b. Low or uneven tire pressure can cause a pull. Brake fluid reservoir. A routine inspection would include all of the following EXCEPT. On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. c. Both A and B a. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. The technician believes there is most likely an issue with the hydraulic system. c. Both A and B You may lose your brakes if you run out of travel before they are fully applied. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. Question: Will a bad master cylinder cause the calipers to stick? Answer B, glazed . Correct answer A-Air in the hydraulic system is the only choice that creates a spongy pedal. 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. B. If your rear drums are the cause of the brake pulsation, you will feel the pulsation at this time, and the car will shake when the emergency brake is applied. The caliper can also freeze up if the caliper slide pins have lost lubrication because they have not been maintained properly. A stuck brake caliper can cause the pads to be pressed against the rotor while driving. Who is correct? 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. Many times the cause of an accident will be due to a problem with the brakes. It will also have a fault code related to the loss of boost. The steering wheel vibrates all the time and always veers to the left. If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. Check your pads for any type of contamination. Technician B believes that the brakes can't be bled. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. All of these would cause a low brake pedal, EXCEPT: Who is correct? Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. That bleeds out any vacuum. Technician B Should I drive my car? Any pull caused by unevenly worn tires will be amplified when you step on the brakes. Answer A, zero brake pedal free travel, will cause a dragging brake condition, but not pulsation. Soft Pedal- The brake pedal is easy to push but there is less braking. Is it a caliper problem? A only Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. 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. The plugged compensator port leads to dragging brakes instead. The consent submitted will only be used for data processing originating from this website. Correct answer C-Brinelling is defined as indentations in the race caused by impact loads or vibrations. The ABS light doesn't go off after the engine starts. The other choices will not do this. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. You notice brake fluid in the engine. c. VAV_\text{A}VA and ITI_\text{T}IT? You have questions like: Will my brakes fail? The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. Checking your brakes at regular intervals is a goodpractice towards the maintenance of your Chevy. What could be the issue? This drag happens with drum brake systems as the springs wear or become rusty. Then, it should be backed off until there's a drag on the wheel. You don't need to do anything different. Which of the following would NOT cause a disc break to drag? Technician B says insufficient clearance between the pads and caliper slider could be the cause. This valve basically allows the rear drums to apply first in the system. You wouldnt pack your own parachute on your first jump, would you? a. 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: My brakes squeak only when I back up. 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. Question: My Chevrolet 2006 has some braking problems. Continue scrolling to learn more about these common issues and their solutions. d. Neither A nor B, A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. This patch of uneven rotor surface is called a pad impression and will cause the brakes to pulsate. b. Proportioning valve 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. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Step 1: Access the drum brake adjustment star wheel. The pictures below show the master cylinder under the brake pedal. Technician A says the quick take up valve must be depressed. For drum brakes, a 10 lb. Sketch each of your designs. initial cost 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. Sinking Pedal: You may notice this while sitting at a stop light. 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. DOT 5 Tech A says that quick take-up master cylinders use two additional pistons to move brake fluid faster. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. . B only To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. c. Both A and B Replace them if you see that they have oil, fluid or grease on them. Technician A a. Question: What makes a car's disc brakes drag hard after a 15-minute drive? You should clean or replace the adjusters to eliminate the problem. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Correct answer C-Both technicians are correct. Correct answer C-New brake rotors don't need to be refinished. B only Loose wheel bearing In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. Find out what these noises mean and what might fix them. 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 The wheel cylinder is attached to the ________.
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