Who is correct? All the other answers are improper ways of adjusting drum brakes. You may feel your Chevy jerk when you brake. Technician B says to check for TCS or ABS blink codes by connecting two pins of the DLC. B. 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. We and our partners use cookies to Store and/or access information on a device. Residual valves are used to maintain constant pressure on the brake system. If your whole car shakes when your brakes are applied, it could be just your rear brakes. c. Both A and B c. Defective metering valve. 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. The brake pedal is firm when applied. c. Both A and B What is the cause? Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. Now I have loud grinding sounds coming from the front left tire. Who is right? Erratic brake pulling occurs on a vehicle when the brakes are applied. One way a caliper can freeze up is by the piston on the caliper being stuck in its bore. There are different causes for brake drag. 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. Technician A A. It will also have a fault code related to the loss of boost. If you do, it could be a matter of minutes until you smash into something. Technician A is wrong because recalibration is not required for these sensors. Who is right? Who is correct? Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. B. Brakes, when applied must not disrupt steering geometry. 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. The steering wheel vibrates all the time and always veers to the left. d. Metering valve. Question: My car won't start unless I press really hard on the brakes. Who is right? 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. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Questions are welcome. 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.. DOT 3 brake fluid should not boil until it gets above 400 degrees Fahrenheit, but old brake fluid that has absorbed water can boil at as little as 284 degrees, which is why it needs to be changed every other year. To further reduce noise, do not machine a disc brake rotor more than absolutely necessary. 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. The steering wheel vibrates all the time and always veers to the left. Even today, your brakes can fail completely, but there are failsafes built into the system to prevent that from happening in most cases. You don't need to do anything different. The air cleaner also can't cause a brake fluid leak. Check your pads for any type of contamination. You wouldnt pack your own parachute on your first jump, would you? 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. 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. B. Copper corrodes easily which makes it a poor option. A. The hose will look OK on the outside, but the inner liner will cause a restriction on the inside. Technician B says that the star wheel assembly should be lubricated on the floating end. Glazed shoes or pads cause brake fade resulting in a loss of friction and reduced braking performance. Brake pads are being replaced on a vehicle with four-wheel disc brakes. Brake systems contain all of these components EXCEPT: Correct answer B-Copper tubing should never be used within the brake 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. If it is too worn, you must replace it. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal. 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! An intermittent noise when braking lightly, as in the video below, could also be related to an uneven surface on the rotors. I recommend having all the brake lines, calipers, and the master cylinder checked for leaks. Correct answer C-The weak hydraulic brake hose causes a spongy pedal. A only a-drum brakes The drum brake adjuster is located under an access cover in the back of the drum brake. A drum or rotor that has deep scores in it will cause the brakes to grab. This site is owned/ operated by an authorized GM Genuine Parts/ACDelco Seller. This leads to excessive pedal travel. B only This difference in pressure happens when the line is pinched or kinked and leaves the brake unit applied and dragging. 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. You also want to use OEM clips and anti-squeal shims. They will need to be resurfaced. 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. Search by Part Number(s), Keywords, or VIN, Chevy Brake Problems: Common Issues and How to Fix Them, How to Program Chevy Silverado Key Fob Remote, How to Reset Your Chevy or GMC Oil Change Light, How to Unlock Your Chevy or GMC Radio for Free, How to Update Chevy and GMC Navigation Units. Technician A if your brake pedal is soft; first check the fluid level to determine if you have a leak in the braking system. The other three answers wouldn't cause the same issues. c. with the vacuum hoses removed B only Question: The brakes on my 2010 Lexus ES brakes kick back when turning the steering wheel. Technician A is working on a vehicle that was brought in with excessive brake pedal travel. Correct answer B-Having a seized caliper piston leads to a high pedal. a. This valve basically allows the rear drums to apply first in the system. 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. 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. Technician A says the master cylinder pushrod adjustment is incorrect. 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. 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. b. 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 building pressure in the system results in brake drag and possible brake lockup. 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. The star adjuster should be adjusted one full turn to back the shoes away from the drum. 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. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. Al+ClX2AlClX3. Technician B states that the brakes can continue to operate like non-ABS brakes. b. Arcing Are they safe? Technician B says when this happens the brakes will operate like a normal non-ABS brake system. For drum brakes, a 10 lb. Your brakes pull to the good side. 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. A. Fluid pressure can bypass the twist during the application, but not return to the master cylinder after release. b. Is this a caliper or could it be a blockage in the brake hose? D. Low brake fluid. a. You can diagnose this by starting your Chevy in order to build vacuum, and then turning it off for four or five minutes. 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. If you try to fix it by adjusting the rear drum brakes, you will still have the problem until you fix the adjusters. a. 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. What could be the cause of the problem? Technician B believes that the brakes can't be bled. Additionally, brake dragging can also be caused by frozen emergency brake cables as well as . If you see the Brake Warning Light illuminated, it is probably a leak. Correct answer D-The leak must be repaired before the linings are replaced. Step 2: Adjust the star wheel. To do this test, drive your car in a remote location with no traffic at a speed of about 30 miles an hour. Question: Does an emergency brake in a car not work after an accident? B. Brake adjustment . d. Neither A nor B. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. When the fluid gets warm and expands, there is no where to go, so it starts applying the calipers, and the brakes drag. If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. When I apply the brakes, especially downhill, I feel the brake pedal presses itself more than I do. 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. It doesn't have power assist until the engine runs for a minute, then it begins to work normally. 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. Continue scrolling to learn more about these common issues and their solutions. This pedal adjustment is crucial, and if adjusted too tightly, the vent port of the master cylinder can become blocked. c. Replacing a ball joint C. Both technicians Question: What if your car is going through brake fluid fast and your brakes don't want to work? I changed the brake pads, but that didn't help much. Excessive tire pressure Some of the cause of brakes dragging on one or more wheels can be: A seized caliper or brake pads that have become jammed in the caliper is probably the most common failure of this type, and can occur due to age, rust, and salt used on winter roads. A only d. Neither A nor B. Correct answer D-Both technicians are wrong. Technician A says that when reassembling a duo-servo brake, the backing plate pads should be lubricated. The common cause of this is a broken or weak retracting spring on drum brakes, corroded or jammed caliper piston, corroded mounting pins or the bushings on a floating caliper, the drum brake self-adjusters are overextended or there is an emergency brake cable that is sticking or is frozen in place. c. Both A and B Overview: How To Use OBD-II Scanner to Check Engine Light Codes - What type of scanners are there. The consent submitted will only be used for data processing originating from this website. They can also cause you to use more fuel. Technician B says backing off the castle nut will cause the bearing to overheat. Which of the following can cause brake system dragging? Tech B states that this function can also be carried out by the driver in manual mode. 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. Contact. Who is right? 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 Correct answer B-Disc brake squeal is caused by the brake pad moving while braking. You could also have a ballooning brake hose when the brakes are applied. Technician A states that the parking brake is not fully released. Correct answer D-Both technicians are wrong because the problem is in the power booster. Technician B says insufficient clearance between the pads and caliper slider could be the cause. Technician B says that the wheel's direction of rotation should be verified by looking at the direction on the scan tool data list. Master Cylinder: An incorrect brake pedal adjustment can cause brake drag. Every car since 1968 has had redundant hydraulic systems, not to mention the parking/emergency brake, to prevent complete brake failure. a. If the brake fluid reservoir is full and there are no signs of leaks, the problem is usually an internal problem that you cant identify just by looking at the master cylinder. Frozen caliper piston c. Both A and B When that happens, I release the brakes and apply them again super fast. Replace the brake linings Correct answer A-The engine must be off to deplete the vacuum reservoir to test the booster. Correct answer B-The greatest drawback of drum brakes is that they are susceptible to fade. Soft or Spongy Brake Pedal:Too much air in the system due to improper bleeding is usually the cause of this problem. A. pumping the brake pedal 10 times with the ignition switch on d. Neither A nor B. A power assist brake booster push rod that is to short will cause which of the following? Bleed the brake lines as recommended by Chevy to fix this. C. The star adjuster should be adjusted until a slight drag on the wheel occurs. d. Air in hydraulic system. 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. In the following questions, "initial" refers to values before the collisions, and "final" refers to values after the collision. Correct answer B-If the amber light is on, it indicates that there is an ABS fault. Another uncommon cause of a soft pedal and long travel, is a bad wheel bearing, which is unrelated to the brakes except for being in the vicinity of the rotors. Next, hold your foot to the pedal while starting the engine. Brake failure is common if the fluid leaks out of the system. Correct answer C-Both techs are correct. Correct answer C-Both techs are correct. b. The caliper piston needs to move back into its bore with no binding. \mathrm{m} / \mathrm{s}.pB,i=4,6,0kg.m/s. 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? _____ Slows a vehicle by converting the vehicle's kinetic energy into electrical energy. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. C. Both technicians The braking systems commonly found on modern vehicles are composed of several components that work together to slow and stop the vehicle. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Technician A says excessive rotor run out could be the cause. a. All of the following items could cause this erratic pull EXCEPT: Correct answer B-Disc brake squeal is often caused by movement of the disc brake pad during braking. Question: My Chevrolet 2006 has some braking problems. Correct answer A-The defective check valve causes a loss in vacuum when the engine is off. c. Both A and B B only B only Answer B, glazed . Then, it should be backed off until there's a drag on the wheel. A only 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). Who is correct? Who is correct? C. Brake adjustment Answer: I don't think it has anything to do with the brake, try starting it without doing that and see what happens. Manage Settings Hopefully this information will help you (and your mechanic) decide where to start when fixing your problem. It does this through a small sliding valve operating on spring pressure. It's a vital component in your car; leave it to the pros. a. Spalling A brake pad that is semi-metallic will be noisier than a non-asbestos or ceramic pad. b. Brake dragging is commonly caused by broken or weak springs on the drum brakes. b. 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? Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. Lubricate slide pins on disc brakes to prevent brake drag and binding. Question: Will a bad master cylinder cause the calipers to stick? a. The two main types of disc brake calipers are: The disc brake caliper is attached to the, Sliding calipers have pistons that are positioned on, bleed air or vacuum from the power booster, Brake bleeder screws enable all of the following tasks to be performed EXCEPT. 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. Regardless, I recommend having a thorough brake inspection by an experienced mechanic. The sliding and moving parts of the brake system require lubrication to prevent them from binding. A. Situations such as heavy loads or long downhill grades where the brakes are used heavily can lead to overheating of the lining, drums, or brake fluid, resulting in a loss of braking called: Which brake is used for holding a vehicle in place when its stationary? If you have this type of rear braking system, it is almost impossible to isolate the rear brakes. If you get no assist, you need a new check valve. Brake fade is loss of stopping power that occurs when excessive heat reduces friction between brake shoe linings and drum. When you remove the master cylinder, you must take all these steps EXCEPT: Correct answer D-Draining the master cylinder isn't required. Technician A says the cause could be a leaking power brake booster diaphragm. d. while driving the vehicle slowly. Scraping Brakes:Metal-to-metal sounds mean that the pads or shoes are worn out. Turn the star-shaped adjuster a few times. 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 possible cause of this leakage might be: Correct answer C-A defective hose would not allow the fluid to enter the engine. Every rotor has a "minimum spec" for thickness, usually stamped on the rotor near the hub where the lug nuts are. Glazing is more a problem with drum brake systems than disc systems because pads get more ventilation. The ABS is what kicks the brake pedal back, so most likely it has something to do with the ABS system. Excessive freeplay delays application and air in the hydraulic system will cause a spongy pedal. 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. Excessive Push Rod Length The brake system in your car contains numerous components, each of which plays a distinct role in braking.
What Time Does Chime Direct Deposit Hit On Holidays,
Is Fiscal Year Capitalized Ap Style,
Chicago Police Department Officer Lookup,
Articles W