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SOS BRAKE & BRAKING SYSTEM EXAM
NEWEST 2025. QUESTIONS & CORRECT
ANSWERS. GRADED A
A car equipped with a vacuum assist power brake system reads an abnormal amount of pedal effort to stop the car, which of the following could be the cause? - ANSA plugged booster air breather A car has a spongy pedal. Which of the following could be the cause? - ANSAir in the system. A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - ANSExcessive clearance between the shoes and drum. A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely source of he problem? - ANSThe master cylinder A cracked or torn vacuum diaphragm in a power booster would likely cause: - ANSHard pedal with very high effort required A customer complains that the brake pedal slowly moves to the floor when a steady pressure is applied. There is no sign of fluid leakage. Which of the following is the most portable cause of the problem? - ANSA worn primary cup
A mechanic finds gear lube inside both rear brake drums on a rear wheel drive vehicle. What is the most likely cause of this problem? - ANSA plugged axle vent A rattle is a single piston disc brake assembly which goes away when the brakes are applied is most likely a result of: - ANSLoose pads in the caliper After drum brakes have been applied and released, the brake fluid returns to the master cylinder reservoir. What causes it to return? - ANSBrake shoe return springs After putting a bearing race in a hub, you notice that the new race is loose and can spin in the hub. What should you do? - ANSReplace the hub All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - ANSClean the master cylinder with a degreasing solvent All of the following procedures, EXCEPT one describe the correct method for bleeding the individual brakes on a car after the master cylinder has been bled: - ANSThe bleeding sequence for all systems begins with the left rear wheel. All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - ANSAir in the system
In order to bleed the system on a vehicle equipped with power brakes: - ANSNone of the above Most anit-lock brake systems require the removal of the pressure modulator fuse when: - ANSA "space-saver" spare tire is being used On a vehicle with a disc/drum brake system, the rear wheels lock up under hard braking. The most likely cause is: - ANSA defective proportioning valve Sliding caliper disc brake pads are kept in adjustment by the - ANSSquare cut piston seal Technician A bench bleeds the master cylinder before installing it on the car. Technician B depresses the pistons and allows gravity to push air out of the master cylinder before connecting the brake lines to the master cylinder. Who is right? - ANSA only Technician A lubricates the pivot points and cables of the parking brake system whenever it is services. Technician B pulls he parking brake lever to its stop, then adjusts the cable so that the rear wheels are locked. Who is right? - ANSA only Technician A says a bad brake hose may cause a fluid leak. Technician B says a defective bake hose may cause a restriction in the hydraulic circuit. Who is right? - ANSBoth A & B
Technician A says a stuck caliper piston can cause the car to pull during braking. Technician B says a broken return spring in a rear drum brake can cause the car to pull during braking. Who is right? - ANSBoth A & B Technician A says all proportioning valves are adjustable. Technician B says only proportioning valves that are height sensing can be adjusted. Who is right? - ANSB only Technician A says brake shoe hold-down springs prevent the self-adjusters from setting the shoes too lightly against the drums. Technician B says the operation of a cable-type self-adjuster can be checked by prying the secondary shoe away from the anchor bolt and watching the action of the cable. Who is right? - ANSB only Technician A says if the cylinder bore of a wheel cylinder is greater than specifications, a larger set of seals should be used. Technician B says that flat spots or grooves in a wheel cylinder's bore are normal. Who is right? - ANSNeither A or B Technician A says it is normal for brake shoes to have excessive wear in the center of the shoe. Technician B says if the lining is less than 1/32 of an inch above the rivets, it should be replaced. Who is right? - ANSB only Technician A says it is normal for the amber "Anti-Lock Brake" lamp to light when the system is activated during braking. Technician B says it is normal for the red "Anti-Lock Brake" lamp to be on whenever the ignition is on and the engine is off. Who is right? - ANSNeither A or B
Technician A says the dust boot of a brake cailiper should be removed and a large dull screwdriver used to pry the piston out of the bore. Technician B says air pressure should be injected into the bleeder screw's bore to force the piston out of the brake caliper. Who is right? - ANSB only Technician A says when the disc brakes anti-rattle springs are incorrectly positioned or missing, the brakes will rattle when they are not being applied. Technician B says if there is a rattle from the brakes when they are not applied, the caliper mounting bolts are probably loose. Who is right? - ANSBoth A & B Technician A says when you are installing a new set of brake shoes a small amount of brake grease should be put on the heel and toe of the shoe. Technician B says when you are installing a new set of brake shoes, grease should be put on all areas of the backing place where there is metal-to-metal contact. Who is right? - ANSB only Technician A uses a pressure tester to check the operation of the accumulator, hydraulic pump, and controls of an ABS system during diagnosis. Technician B checks an ABS system by checking the codes in the control computers memory. Who is right? - ANSBoth A & B Technician A uses a silencer belt only on brake rotors that have heavy heat checks while matching them. Technician B always machines a brake rotor to the minimum thickness allowed. Who is right? - ANSNeither A or B
The brake lights on a car do not light when the brake pedal is depressed, which of the following is the LEAST likely cause of the problem? - ANSA burned out bulb. The brake warning light on the dash stays on all the time, which of the following could be the cause of the problem? - ANSA problem in the hydraulic circuit The brakes of a car squeal each time they are applied, which of the following is the LEAST likely source of the noise? - ANSGlazed brake pads The brakes of a car tend to drag, which of the following could be the cause? - ANSA stuck wheel cylinder or caliper piston The front brakes of a car equipped with disc brakes in the front and drum brakes in the rear, grab quickly as light pressure is applied to the brake pedal, which of the following could be the cause of the problem? - ANSDefective metering valve There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is the likely cause of the problem? - ANSA broken shoe hold-down spring or pin What does a load sensing proportioning valve do? - ANSIt increases the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded
When the brakes are applied on a car with disc-drum brakes, a vibration or pulsating movement is felt. What can cause this problem? - ANSA rotor thickness variation Which of the following can be used to check for rotor thickness variation? - ANSDial indicator Which of the following conditions does not dictate that the brake hydraulic system be flushed after the necessary repairs have been made? - ANSEvidence of air in the system Which of the following could be a symptom of over-torqued lug nuts? - ANSA brake pedal pulsation during braking. Which of the following describes the correct sequence for bleeding brake lines on most front wheel drive vehicles? - ANSRR,LR, RF, LF Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive vehicles: - ANSRR, LR, RF, LF Which of the following describes the proper way to depressurized an ABS system? - ANSPump the brake pedal at least 25 times (or more, depending on the manufacturer's recommendation) with the ignition off. Which of the following is a quick way to determine whether the master cylinder is bad? There are no external leaks in the system. - ANSPump up
the brake pedal, then hold it firm. If the pedal slowly drops to the floor, the master cylinder is bad. Which of the following is a true statement about proportioning valves? - ANSThey provide better braking balance during hard stops Which of the following is not a necessary precaution to follow when performing brake repairs on an ABS equipped vehicle? - ANSAlways remove the electronic brake control module fuse before adjusting or replacing a wheel speed sensor Which of the following is not correct in the procedure for preparing a brake rotor for matching? - ANSUse a brake micrometer to measure the diameter Which of the following is the LEAST likely cause of one brake dragging? - ANSA corroded master cylinder bore Which of the following is the most likely cause of low fluid level in the master cylinder? - ANSWorn brake pads and linings Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - ANSMost ABS brake lines can be bled like a convention ( non ABS) system (Caution must be taken because of the extreme pressure)
served by the primary pressure chamber will not operate. Who is right? - ANSBoth A & B While discussing the probable causes for a slow returning brake pedal: Technician A says a leaking hydraulic line could cause the problem. Technician B says a clogged quick take-up valve could cause the problem. Who is right? - ANSB only While road testing a car with an ABS system, Technician A says during heavy braking, several clicks should be heard from the rear wheels as they try to lock up. Technician B says a spongy pedal during braking is normal. Who is right? - ANSA only While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of this problem is: - ANSBrake fluid or grease on the brake linings. With the car standing still, you can hear a squeaking noise when applying the brake pedal slowly. What could cause this noise? - ANSDry backing plate contact surfaces. You are rebuilding a master cylinder. What should you use to lubricate the internal parts? - ANSBrake fluid
