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CERTIFICATION-
BRAKES
LATEST
When adjusting disc-drum brakes, you should: - ANSWERS-Adjust the rear brakes after releasing the parking brakes You are rebuilding a master cylinder. What should you use to lubricate the internal parts? - ANSWERS-Brake fluid Which of the following is the most likely cause of low fluid level in the master cylinder? - ANSWERS-Worn brake pads and linings Which of the following describes the correct sequence for bleeding brake lines on most front wheel drive vehicles? - ANSWERS-RR,LR, RF, LF All of the following are steps in the procedure for servicing a typical dual master cylinder, EXCEPT: - ANSWERS-Clean the master cylinder with a degreasing solvent The brakes of a car tend to drag, which of the following could be the cause? - ANSWERS-A stuck wheel cylinder or caliper piston END OF PAGE
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CERTIFICATION-
BRAKES
LATEST
When repairing damaged brake line, which of the following is correct? - ANSWERS-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? - ANSWERS-A worn primary cup A car has an excessive amount of pedal travel during brake application, which of he following could be the cause? - ANSWERS-Excessive clearance between the shoes and drum. 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: - ANSWERS-The bleeding sequence for all systems begins with the left rear wheel.
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CERTIFICATION-
BRAKES
LATEST
A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely source of he problem? - ANSWERS- The master cylinder If vacuum is present on both sides of the diaphragm in a brake booster: - ANSWERS-The brakes are being released Which of the following is not a necessary precaution to follow when performing brake repairs on an ABS equipped vehicle? - ANSWERS- 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? - ANSWERS-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: - ANSWERS-Conventional braking should still be available
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CERTIFICATION-
BRAKES
LATEST
What information might be found on a brake drum to help a mechanic? - ANSWERS-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? - ANSWERS-The lathe was not adjusted properly when the drum was turned Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? - ANSWERS-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: - ANSWERS-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: - ANSWERS-Smaller and goes towards the front of the car.
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CERTIFICATION-
BRAKES
LATEST
When turning brake drums: - ANSWERS-use a dampening strap to reduce chatter Which of the following is NOT a necessary drum brake measurement? - ANSWERS-run-out On a 3 - channel system, which wheels are on the same circuit? - ANSWERS-both rear wheels One way to test an ABS wheel speed signal is to use on your digital multimeter. - ANSWERS-AC volts The key input for the ABS control module comes from the: - ANSWERS-wheel speed sensors ABS speed sensor and sensor rings: - ANSWERS-should not be hammered or tapped on and should always be replaced as a matched set
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CERTIFICATION-
BRAKES
LATEST
Flexible brake hoses should be replaced: - ANSWERS-when dampness is evident on the hose Which of the following should be used to check for rotor thickness variation: - ANSWERS-Micrometer After rebuilding a master cylinder, the rod between the master cylinder and booster should be: - ANSWERS-adjusted properly Upon inspecting brake fluid condition, the technician observes the diaphragm in the master cylinder cup is swollen. Which of the following is the most likely cause? - ANSWERS-silicone fluid added to the system When inspecting brake fluid levels, a technician observes low fluid levels. which of the following should be done first? - ANSWERS- Inspect disc brake pads for excessive wear Which of the following is true about most properly functioning anti-lock brake systems? - ANSWERS-The brakes may lock up at speeds less than 10 miles per hour
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CERTIFICATION-
BRAKES
LATEST
A properly functioning load sensing proportioning valve will: - ANSWERS-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? - ANSWERS-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? - ANSWERS-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? - ANSWERS-A problem in the hydraulic circuit Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? - ANSWERS-Open wheel sensor circuit
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CERTIFICATION-
BRAKES
LATEST
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? - ANSWERS-A burned out bulb. Which of the following incorrect service procedures could cause brake pedal pulsation? - ANSWERS-incorrect run-out on the car brake lathe What type of rotor surface provides the best braking with new pads? - ANSWERS-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. - ANSWERS-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: - ANSWERS-NOT caused by improperly torqued wheels, damaged backing plates, or lubricated shims
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CERTIFICATION-
BRAKES
LATEST
Before replacing a hydralic brake hose on an ABS equipped vehicle, you should first: - ANSWERS-relieve brake system pressure according to manufacturer procedures When would the pump motor be activated in an anti-lcok brake system with traction assist? - ANSWERS-when brake pedal pulsates There is a scraping sound coming from one rear brake. The sound stops when the brakes are applied. What is most likely the cause of the problem? - ANSWERS-a broken shoe hold-down spring or pin If a drum brake self-adjuster seizes up, the likely result will be: - ANSWERS-NOT a low pedal, worn or brake drum, or a loose emergency brake cable. After drum brakes have been applied and released, the brake fluid returns to the master cylinder reservoir. What causes it to return? - ANSWERS-brake shoe return springs
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CERTIFICATION-
BRAKES
LATEST
On a single anchor duo-servo drum brake system, which shoe does most of the braking? - ANSWERS-secondary shoe Which lining does most of the braking on a leading/trailing brake? - ANSWERS-primary shoe This tool is used to? - ANSWERS-Adjust the brake shoes to the drum Which of the following could be a symptom of over-torqued lug nuts? - ANSWERS-A brake pedal pulsation during braking. Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive vehicles: - ANSWERS-RR, LR, RF, LF In disc brake caliper assemblies, the "square cut seal" is usually located:
- ANSWERS-In the caliper piston bore When performing a caliper overhaul, what would you use to remove the pistons from the calipers? - ANSWERS-Compressed air
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CERTIFICATION-
BRAKES
LATEST
Which of the following can be used to check for rotor thickness variation? - ANSWERS-Dial indicator On a vehicle with a disc/drum brake system, the rear wheels lock up under hard braking. The most likely cause is: - ANSWERS-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? - ANSWERS- Replace the hub
