which of the following can cause brake system dragging

I changed the brake pads, but that didn't help much. A restricted disc brake caliper hose might cause all of these EXCEPT: It doesn't have power assist until the engine runs for a minute, then it begins to work normally. A. 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. A only Al+ClX2AlClX3\ce{Al + Cl2 -> AlCl3} B. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. Smith, Michael Abbott, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. 200MeV200 \mathrm{MeV}200MeV is typical energy released in a fission reaction. Figuring out the problem and solutionis simply the result of having the right knowledge combined with an intelligent, systematic approach. It does this through a small sliding valve operating on spring pressure. Technician A states that the parking brake is not fully released. Don't drive the car in any case; there is something wrong with your brakes if the pedal is soft. 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. Correct answer A-You must adjust the star adjuster until there's a slight drag on the drum. Excessive tire pressure Then, it should be backed off until there's a drag on the wheel. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. Your brakes pull to the good side. Brake drag often occurs when the fluid in your system overheats. There are different causes for brake drag. ASE A4 Practice Test. Turn the star-shaped adjuster a few times. However, there are shims on the brake pads which can get caught in these grooves from built up debris that may be there. Who is correct? Bleed the brake lines as recommended by Chevy to fix this. Brake fluid reservoir. 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. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. 7. Question: A year and a half ago (from 78,000 to 88,000 miles), I had the whole brake system replaced, i.e., pad, rotor, and lines. A only The building pressure in the system results in brake drag and possible brake lockup. c. Brinelling In the brake booster there is a washer that is suppose to keep the pushrod centered as it goes into the mastercylinder. All of these would cause a low brake pedal, EXCEPT: 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. Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. A only The caliper piston needs to move back into its bore with no binding. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. Is it a caliper problem? a. Spalling Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. 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. Fear of the unknown causes anxiety. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. 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. To determine if your rear brakes are the problem, you need to test them in isolation. Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. 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. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. Question: My rear inner pads wear down faster than the outer ones. C. The star adjuster should be adjusted until a slight drag on the wheel occurs. . 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. 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. b. If the dust boot that protects the piston from the elements gets torn, water and debris will penetrate the metal in the caliper and cause rust and corrosion. d. Neither A nor B. Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. The other three answers can lead to a low brake pedal. Answer: It sounds like you may have an ABS sensor not reading properly or maybe a damaged ABS sensor wire? If your car sits for long periods without moving, moisture from rain or high humidity causes your rotors to rust, except for the patch of rotor surface where the pads rest. Technician B says backing off the castle nut will cause the bearing to overheat. a. VAV_\text{A}VA and I1I_1I1? Brake fade is when the brake fluid is contaminated, so it causes a soft brake pedal, air in the lines, leaking master cylinder, frozen or seized caliper pins or piston, worn out pads, and glazed rotors. Return Springs: Weak or broken return springs will result in brake drag. 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 Who is correct? Here are five of the most common brake problems I run into, starting with the most serious. 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? This problem could be caused by a bad: Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. Residual check valve See less 79 RC bought from original owner in 2006 Question: What makes a car's disc brakes drag hard after a 15-minute drive? If your whole car shakes when your brakes are applied, it could be just your rear brakes. If there is a leak somewhere the fluid level may be so low as to make even the redundantsystem ineffective. Binding pedal linkage would lead to a hard pedal, which is also true for a dented brake line. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. A faulty proportioning valve or master cylinder could also cause a pull to one side when braking; this is unusual but it does happen. variable hours is outside the range 0 through 80. b. Caliper piston seized d. Repair leak and replace brake linings. 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 D-A restricted disc brake caliper hose won't cause pedal pulsation. d. Neither A nor B, The front wheel bearings are being adjusted. It can also be a vacuum hose leak to the booster, or it can be a booster that is defective. What is this type of bearing failure called? A. Basic Body Work: Fixing a Deep Scratch in Your Car's Paint. 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. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? Brake failure is common if the fluid leaks out of the system. The effectiveness of braking is mostly determined by: Tech A says that the heavier the vehicle, the more stopping power is needed. The brakes can fail if your hydraulic system or master cylinder is leaking. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. a. A only b. D. Neither technician. 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. Lubricate slide pins on disc brakes to prevent brake drag and binding. Question: My Chevrolet 2006 has some braking problems. 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. A brake hose problem like this can take two forms. Brake adjustment The PCV valve vents the crankcase of blow by gases and isn't part of the braking system. Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. Object B has initial momentum pB,i=4,6,0kg.m/s.\vec{p}_{B, i}=\langle 4,6,0\rangle kg. A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. Correct answer B-This is the standard process by many OEMS when a new rotor is installed. Can you help me understand where the problems are and what I should repair or replace? Replacing sealed wheel bearing Technician A says the cause could be a leaking power brake booster diaphragm. 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. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Answer: It could be a sticking caliper piston, slide pins, or the pads could be corroded in the caliper preventing them from moving freely. Correct answer C-A short push rod length will have to travel farther for contact and result in excessive pedal travel. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. The other choices do not affect this concern. For drum brakes, a 10 lb. B only b. Typically a seized caliper or pads will cause a burning smell, a pull to one side, and dragging at one wheel, but it is possible for it to stick without those, and effectively lessening your braking by nearly half (if it is a front wheel, which provide 75% of the braking). Correct answer B-Having a seized caliper piston leads to a high pedal. 1. If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. Slight scoring or heat spots The tires' contact surfaces expand when you brake, thus putting more pressure on the bad tire and causing the pull to worsen. The other complaints wouldn't occur as a result. Been there, done that! Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. The drum brake adjuster is located under an access cover in the back of the drum brake. D. Neither technician. Question: I had problems with my brakes grinding and pulling to the right when braking. If the master cylinder is leaking externally, you will see fluid dripping from the place where the rod goes into the cylinder. 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. If the vehicle has low or uneven tire pressure, there might be a pull. The sliding and moving parts of the brake system require lubrication to prevent them from binding. The fix for this brake problem is simple: resurfacing the rotors, if they are still thick enough (see section 3 above), or replacing them if they are not. A. If you do, it could be a matter of minutes until you smash into something. Brake fluid expands as brake fluid temperature rises from normal braking. The component in the Figure is involved what procedure? Over time, a caliper can freeze up gradually, a process that can go unnoticed for a long period of time. Unusual brake pedal feel. Technician B says that the star wheel assembly should be lubricated on the floating end. Correct answer C-Both techs are correct. 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. Answer: I recommend checking the brake light switch, it may be out of adjustment and applying a little pressure to the brake pedal. Use the relative acceleration method to graphically determine the linear velocity and linear acceleration of the piston. I recommend having this area of the brakes inspected first. Many times the cause of an accident will be due to a problem with the brakes. c. VAV_\text{A}VA and ITI_\text{T}IT? 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? The ABS light doesn't go off after the engine starts. 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! That bleeds out any vacuum. The other major way brakes act up is when they fail to disengage completely in one way or another. c. Low brake fluid D. loosening the front wheel bleeder screws with the ignition switch on. This lubrication will help prevent a possible squeaky noise as the shoes move across the plate. Which technician is most likely correct? b. Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. A drum or rotor that has deep scores in it will cause the brakes to grab. A vehicle has a very erratic brake pulling concern while applying the brakes. 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. As in: hit the brakes, let go, brake pedal comes back up, master cylinder side piston doesnt came all the way back and keeps pressure on the master. At the first sign of trouble with your brakes, you need to either fix them or seek help from a certified GM mechanic. Contact. If the impact occurs in 0.06 s, determine the average impulsive force acting on the car. Replace them if you see that they have oil, fluid or grease on them. d. Air in hydraulic system. The master cylinder, where it attaches to the brake pedal. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. A only A vehicle with 4-wheel disc brakes has a brake squeal. In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. In Fig. There are four types of brake fade. A hydroboost power brake vehicle with a hard pedal can be the result of a belt that is loose on the power steering pump, fluid levels are low, power hoses leak or there are valves with leaks or faults on the hydroboost unit. This heat can be caused by a dragging brake unit. A better idea of where the master cylinder is located in relation to the brake pedal. Technician A is wrong because recalibration is not required for these sensors. "Scratcher" and "sensor" are types of disc brake pad __________ indicators. b. Proportioning valve Copper corrodes easily which makes it a poor option. Question: Will a bad master cylinder cause the calipers to stick? The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. They will need to be resurfaced. Continue with Recommended Cookies. c. Defective metering valve. An often-misdiagnosed cause of pull is a collapsed brake hose. Correct answer D-Both of these techs are wrong. Within disc brake calipers, the pistons are sealed by a: Which of the following take(s) up the clearance as disc brake pads wear? Technician A is wrong because the parking brake would only affect the red brake light. Replace the defective part. 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. D. Neither Technician. 8. a-drum brakes To put this discussion about brake proportioning valves in context, there are actually three basic kinds of valves in play in a non-ABS system. Technician B The technician believes there is most likely an issue with the hydraulic system. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. All of these might lead to a low brake pedal, EXCEPT: B only 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 Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. The suspension additionally steering service area involves the following components: Steering system, Suspension system, Wheel Alignment and Wheel and Tires Service Log. Then, it needs to be backed off until the wheel begins to spin freely. You can pump the brakes before application to help offset this problem, but you need to get it fixed. d. Metering valve. b. 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. The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. tech A states that brake-by-wire means there is no mechanical or hydraulic connection between the break pedal and the wheel break units. Should I drive my car? Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. 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. They consist of the index of refraction of the lens and the radii of curvature for its two surfaces. Replace the hydrobooster. Correct answer B-Having a seized caliper piston leads to a high pedal. A rotor face must be within .0005 inch of being parallel and flat with no more than .003 inch of runout. While these are the most common causes of brake issues on your Chevy, you should never allow your brakes to go bad. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. On a car with a drum/disc system, the front brakes lock up on light pedal application. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. You should put new pads on your Chevy and replace or repair the rotors. The brakes of large trucks are different. 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. A routine inspection would include all of the following EXCEPT. Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. It sounds to me like some components aren't moving freely and are getting stuck causing the pulling and noises.

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