Another cause of a hard brake pedal can be a brake caliper that is stuck or seized. Here are five of the most common brake problems in cars. 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. Always use OEM recommended clips and anti-squeal shims. b. If you get no assist, you need a new check valve. The first thing you should do is check your brake fluidlook in your owner's manual to see how. Technician A B. You should put new pads on your Chevy and replace or repair the rotors. A power assist brake booster push rod that is to short will cause which of the following? A. When you make the final adjustments to the drum brakes: 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? A only Mechanical fade occurs when the brake drum gets so hot it expands away from the brake linings. d. Neither A nor B, The front wheel bearings are being adjusted. Technician A states that the parking brake is not fully released. 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. Replacing your tires will fix this, or you could try rotating your front tires to the rear of the vehicle. 7. 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. d. Neither A nor B. Al+ClX2AlClX3. Technician A believes it's a defective proportioning valve issue. Auto Mechanical Practices Test; ASE Test Guide; Auto Mechanic Flash Cards; 2023 Edition. The other major way brakes act up is when they fail to disengage completely in one way or another. It's also possible to check the blink codes with the DLC. All the other answers are improper ways of adjusting drum brakes. What can cause brake drag, rear wheel lock up, or front wheel lockup upon breaking? Meanwhile, pull up on the handle just enough to feel the rear brakes grab slightly. To perform a thorough inspection of brake pads, you should do all of the following EXCEPT. With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. 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. Question: I just had brakes and rotors done two months ago on my vehicle. What is this type of bearing failure called? Calculate the following quantities: The total initial kinetic energy of the system. On ABS systems that have a high-pressure accumulator, this is depressurized by: d. Neither A nor B. c. Both A and B The plugged compensator port leads to dragging brakes instead. Luckily, changing a brake caliper is not a hard job, and can be accomplished in about an hour. I put new calipers, rotors and rubber lines on a couple of months ago and now the calipers stick sometimes. Brake adjustment b. Proportioning valve You may feel your Chevy jerk when you brake. 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. 4-wheel disc brakes on a vehicle are causing brake squeal. B only c. Both A and B 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. Doesnt seem real plausable to me but I'm running out of other ideas and parts to replace. D. Neither technician. Technician B If you do, it could be a matter of minutes until you smash into something. A short power assist brake booster push rod will lead to which of these? They will need to be resurfaced. You notice brake fluid in the engine. Technician B says air trapped in the hydraulic system could be the cause. b. Correct answer D-Both technicians are wrong because the problem is in the power booster. B only 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. Consider a system consisting of both objects A and B. Technician B says that the star wheel assembly should be lubricated on the floating end. They can also cause you to use . Answer: The first thing you need to do is remove all four wheels and inspect all caliper slide pins, pistons, and brake pads and shoes. Continue scrolling to learn more about these common issues and their solutions. Who is correct? The rear brake linings are soaked with axle grease but still have a lot of lining left on them. First, it can act like a restrictor in the line. The vacuum booster can be checked by pumping the pedal a few times while the engine is off. a. What's more, I'll teach you to fix it in either case. B. D. Brake pedal pulsation. The wheel speed sensor is being diagnosed with an OEM diagnostic scan tool. If you determine that you have a leak, check the calipers, hoses, lines, master cylinder and wheel cylinders for the leak. A soft brake pedal is a MAJOR brake issue. c. Both A and B 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. The pressure can continue to build and the hose might expand, but not release the pressure to the brake units. Then, it's easier to empty once it's out. 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. 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? The way to prevent these issues is to avoid driving in deep puddles, or areas where salt is used on the roads, but if that isn't an option, be sure to clean the wheels and underside of the car often in winter. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Then, it needs to be backed off until the wheel begins to spin freely. The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. The brakes of large trucks are different. A slight gap should be present between the pushrod and the master cylinder. 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. A common symptom of this type of braking issue is a burning smell from the amount of heat the hung up brake generates. It will not be caused by lateral runout, which would cause brake chattering or pulsing. B. Brakes that Grab: If there is oil, brake fluid or grease on the pads, they will slip and then grab hold. Who is correct? The ABS (antilock brake system) amber light does not go off after the engine is started. The ABS and TRACTION OFF indicator lights stay on while the engine is running. Low Brake Fluid:Your Chevymay develop a leak in the system that will result in the fluid level going down. b. Here are four common brake squeaks plus a bonus scraping noise; compare these situations to yours. d. Seized caliper piston. Any noises coming from your car may result in you ignoring the indicators. 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. This also reduces braking power. a. The master cylinder, where it attaches to the brake pedal. B only You can pump the brakes before application to help offset this problem, but you need to get it fixed. 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. Typically rusted rotors or drums only happen when a car has been sitting for a long period. This delay causes the spongy feel. 3 Basic Kinds of Valves in a Non-ABS System. a. 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 tire pressure If nothing happens, check the vacuum connections, and if they are okay, you need a new booster and vacuum hose. b. To reduce this, the mating surfaces need to be cleaned and lubricated. When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. Sometimes, though not very often, the brakes won't work, and it sounds like it's grinding for one or two seconds. If you don't know what to look for, have a mechanic who knows what they are doing and are reputable to inspect the brakes. b. Wash in hot, soapy water and dry. 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. Tech B says that banjo fittings are commonly used to connect brake hoses to wheels brake units. Who is right? Seized caliper piston Some vehicles have __________ openings in the backing plate to allow for manual adjustment of the brake shoes. b. Which of the following conditions can cause brake pedal fade? This can be due to oil, grease or fluid on a pad, a caliper that is stuck, brake line blockage, or wheel bearings that are loose. B only 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. What are possible causes? Technician A is wrong because the parking brake only affects the RED Brake Light not the amber. 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! In a brake system with disc front and drum rear, there is a valve in the system known as a metering valve or hold-off valve. To further reduce the noise, do not machine the rotor more than needed. In this article, I will explain the most common reason for a slipping automatic transmission and the most common reason for a slipping standard transmission. Replace the defective part. 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. Then there are minor issues such as brake squealing, brake shudder/pulsing, burning smells, leaking fluids, pulling to one side, etc. Correct answer B-Having a seized caliper piston leads to a high pedal. The mechanic is now telling me I need all of those parts replace again. It also expands when subjected to high pressures. d. Air in hydraulic system. The backing plate has holes stamped in it for all of the following to pass through, EXCEPT ______. B. 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. c. Both A and B They are not compensating for normal lining wear. 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. The other complaints wouldn't occur as a result. A routine inspection would include all of the following EXCEPT. Which is the correct way to service these brakes? . c. Low brake fluid Question: The brakes on my new O4 Ford Explorer are dragging. a. Tech B Tech A says that the vacuum booster increases the vacuum in the brake system. I've included some pictures and FAQs. Who is right? Here are five of the most common brake problems I run into, starting with the most serious. The failing bearing allows the hub to move around, effectively pushing the brake pads back into the caliper as far as it can. c. VAV_\text{A}VA and ITI_\text{T}IT? d. Neither A nor B. You wouldnt pack your own parachute on your first jump, would you? 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: What causes a brake pedal to depress all the way to the floor in a car? 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. Answer: Is your abs light on? If it involves only one of the front brake units, the vehicle will pull to the side with the dragging unit. If you were to remove the line at the master cylinder and at the caliper, could you blow compressed air through it? If this is your problem, then the fix is to resurface the rear drums or replace them. Check your brake hoses for anomalies. 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).