Download SOS Mechanic Certification- Brakes Final Exam Complete 100 Questions & Correct Answers and more Exams Nursing in PDF only on Docsity!
SOS Mechanic Certification- Brakes Final Exam Complete
100 Questions & Correct Answers Already Graded A+
Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? - CORRECT ANSWER >>> Sealed non-serviceable to test a vacuum power brake booster in the vehicle, you should pump the brake pedal at least 4 times, hold the brake pedal depressed, and start the engine. the brake pedal should: - CORRECT ANSWER >>> drop slightly and remain firm You are installing a set of brake shoe linings that are not the same length. Traditionally, the primary shoe lining is: - CORRECT ANSWER >>> Smaller and goes towards the front of the car. A cracked or torn vacuum diaphragm in a brake power booster would most likely cause: - CORRECT ANSWER >>> a hard pedal feel requiring very high pedal effort to stop 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? - CORRECT ANSWER >>> A plugged axle Which of the following incorrect service procedures will cause brake lock-up? - CORRECT ANSWER >>> master cylinder push rod adjusted too long Which of the following describes the proper way to depressurized an ABS system? - CORRECT ANSWER >>> Pump the brake pedal at least 25 times (or more, depending on the manufacturer's recommendation) with the ignition off.
The rear brakes are dragging after having new linings installed and the drums machined. the most likely cause is the: - CORRECT ANSWER >>> technician use the parking brake to adjust shoes and the cable is stuck When turning brake drums: - CORRECT ANSWER >>> use a dampening strap to reduce chatter Which of the following is NOT a necessary drum brake measurement? **- CORRECT ANSWER
** run-out On a 3-channel system, which wheels are on the same circuit? - CORRECT ANSWER >>> both rear wheels One way to test an ABS wheel speed signal is to use _____ on your digital multimeter. - CORRECT ANSWER >>> AC volts The key input for the ABS control module comes from the: - CORRECT ANSWER >>> wheel speed sensors ABS speed sensor and sensor rings: - CORRECT ANSWER >>> should not be hammered or tapped on and should always be replaced as a matched set Flexible brake hoses should be replaced: - CORRECT ANSWER >>> when dampness is evident on the hose Which of the following should be used to check for rotor thickness variation: - CORRECT ANSWER >>> Micrometer
Which of the following is a true statement about proportioning valves? **- CORRECT ANSWER
** They provide better braking balance during hard stops A properly functioning load sensing proportioning valve will: - CORRECT ANSWER >>> cause an increase in the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded. Why don't disc brake system usually need adjustment? - CORRECT ANSWER >>> A certain amount of pressure is maintained by the metering valve 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? - CORRECT ANSWER >>> Defective metering valve The brake warning light on the dash stays on all the time, which of the following could be the cause of the problem? - CORRECT ANSWER >>> A problem in the hydraulic circuit Which of the following would be the LEAST likely cause for an intermittent problem in an ABS ** should not be hammered or tapped on and should always be replaced as a matched set Flexible brake hoses should be replaced: - CORRECT ANSWER >>> when dampness is evident on the hose Which of the following should be used to check for rotor thickness variation: - CORRECT ANSWER >>> Micrometer Which of the following is a true statement about proportioning valves? - CORRECT ANSWER >>> They provide better braking balance during hard stops A properly functioning load sensing proportioning valve will: - CORRECT ANSWER >>> cause an increase in the hydraulic pressure during braking at the rear wheel cylinders when the vehicle is loaded. Why don't disc brake system usually need adjustment? - CORRECT ANSWER >>> A certain amount of pressure is maintained by the metering valve 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? - CORRECT ANSWER >>> Defective metering valve The brake warning light on the dash stays on all the time, which of the following could be the cause of the problem? - CORRECT ANSWER >>> A problem in the hydraulic circuit Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? - CORRECT ANSWER >>> Open wheel sensor circuit 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? - CORRECT ANSWER >>> A burned out bulb. Which of the following incorrect service procedures could cause brake pedal pulsation? - CORRECT ANSWER >>> incorrect run-out on the car brake lathe What type of rotor surface provides the best braking with new pads? - CORRECT ANSWER >>> A smooth, flat surface
which of the following is a quick way to isolated a defective master cylinder? There are no external leaks in the system. - CORRECT ANSWER >>> pump up the brake pedal, then hold it firm. if the pedal slowly drops to the floor, the master cylinder may be defective. A common cause of pedal pulsation during brake application is: - CORRECT ANSWER >>> NOT caused by improperly torqued wheels, damaged backing plates, or lubricated shims the car is at reset. When you slowly apply the brake pedal you hear a squeaking noise at the rear of the vehicle. what could cause this noise? - CORRECT ANSWER >>> dry backing plate contact surfaces While test driving a car, the mechanic finds that the right front brake "grabs". The most likely cause of this problem is: - CORRECT ANSWER >>> brake fluid or grease on the brake linings Wheel speed sensors: - CORRECT ANSWER >>> send an A/C signal to the control module Which of the following incorrect service procedures will cause brake lock up? - CORRECT ANSWER >>> Master Cylinder push rod adjusted too long During a road test, you find that when normal breaking pressure is applied the pedal slowly goes to the floor. What is the likely cause of this problem? - CORRECT ANSWER >>> A leaking master cylinder primary piston seal. Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first: - CORRECT ANSWER >>> relieve brake system pressure according to manufacturer procedures When would the pump motor be activated in an anti-lcok brake system with traction assist? - CORRECT ANSWER >>> when brake pedal pulsates
When performing a caliper overhaul, what would you use to remove the pistons from the calipers? - CORRECT ANSWER >>> Compressed air Sliding caliper disc brake pads are kept in adjustment by the - CORRECT ANSWER >>> Square cut piston seal When the brakes are applied on a car with disc-drum brakes, a vibration or pulsating movement is felt. What can cause this problem? - CORRECT ANSWER >>> A rotor thickness variation A rattle is a single piston disc brake assembly which goes away when the brakes are applied is most likely a result of: - CORRECT ANSWER >>> Loose pads in the caliper Which of the following would most likely cause dragging brakes? - CORRECT ANSWER >>> A defective vehicle load sensor 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? - CORRECT ANSWER >>> A broken shoe hold- down spring or pin Which of the following can be used to check for rotor thickness variation? **- CORRECT ANSWER
** Dial indicator On a vehicle with a disc/drum brake system, the rear wheels lock up under hard braking. The most likely cause is: - CORRECT ANSWER >>> A defective proportioning valve 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? - CORRECT ANSWER >>> Replace the hub
When adjusting disc-drum brakes, you should: - CORRECT ANSWER >>> Adjust the rear brakes after releasing the parking brakes You are rebuilding a master cylinder. What should you use to lubricate the internal parts? - CORRECT ANSWER >>> Brake fluid Which of the following is the most likely cause of low fluid level in the master cylinder? - CORRECT ANSWER >>> Worn brake pads and linings Which of the following describes the correct sequence for bleeding brake lines on most front wheel drive vehicles? - CORRECT ANSWER >>> RR,LR, RF, LF All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - CORRECT ANSWER >>> Clean the master cylinder with a degreasing solvent The brakes of a car tend to drag, which of the following could be the cause? - CORRECT ANSWER >>> A stuck wheel cylinder or caliper piston When repairing damaged brake line, which of the following is correct? **- CORRECT ANSWER
** Replace entire line that is damaged with a new line bent to the right shape using a tube bender 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? - CORRECT ANSWER >>> A worn primary cup A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - CORRECT ANSWER >>> Excessive clearance between the shoes and drum.
Which of the following is not a necessary precaution to follow when performing brake repairs on an ABS equipped vehicle? - CORRECT ANSWER >>> Always remove the electronic brake control module fuse before adjusting or replacing a wheel speed sensor Which of the following is true when inspecting wheel speed sensors? **- CORRECT ANSWER
** You should measure the air gap between the sensor and the reluctor wheel teeth
Which of the following would be the result of an inoperative ABS pump/motor assembly: - CORRECT ANSWER >>> Conventional braking should still be available What information might be found on a brake drum to help a mechanic? **- CORRECT ANSWER
** The maximum diameter dimension When checking a newly turned drum before putting it back on, you notice a thread-like grooves in the braking surface. Why are the grooves there? - CORRECT ANSWER >>> The lathe was not adjusted properly when the drum was turned
