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SOS MECHANIC CERTIFICATION- BRAKES EXAM
WITH CORRECT ANSWERS
"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"
"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"
"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" "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? - CORRECT ANSWER silicone fluid
added to the system"
"Which of the following is true about most properly functioning anti-lock brake systems? - CORRECT
ANSWER The brakes may lock up at speeds less than 10 miles per hour"
"Which of the following is true about bleeding brake lines on most ABS equipped vehicles? - CORRECT
ANSWER Most ABS brake lines can be bled like a conventional (non-ABS) system. However, caution
must be taken because of the extreme pressure."
"Most anti-lock brake systems require the removal of the pressure modulator fuse when: - CORRECT
ANSWER a "spaced-saver" spare tire is being used and mismatched tires are being installed"
"The brakes of a car squeal each time they are applied, which of the following is the LEAST likely source
of the noise? - CORRECT ANSWER Glazed brake pads"
"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"
"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"
“Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? -
CORRECT ANSWER Sealed non-serviceable"
"ABS speed sensor and sensor rings: - CORRECT ANSWER should not be hammered or tapped on and
should always be replaced as a matched set"
"Which of the following describes the proper sequence to bleed brake lines on most rear wheel drive
vehicles: - CORRECT ANSWER RR, LR, RF, LF"
"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"
"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"
"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 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 the LEAST likely cause of one brake dragging? - CORRECT ANSWER A
corroded master cylinder bore"
"A car has a spongy pedal. Which of the following could be the cause? - CORRECT ANSWER Air in the
system."
"Which of the following is not correct in the procedure for preparing a brake rotor for matching? -
CORRECT ANSWER Use a brake micrometer to measure the diameter"
"All of the following, EXCEPT one could cause the parking brakes to fail or not hold: - CORRECT
ANSWER Air in the system"
"An example of an incorrect procedure for replacing brake pads in a disc brake system is: - CORRECT
ANSWER Remove the piston from the caliper and clean all rust corrosion, and dirt"
"A car's wheels severely vibrate when the brakes are applied, which of the following is the LEAST likely
source of he problem? - CORRECT ANSWER The master cylinder"
"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"
"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"
"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" "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"
"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: - CORRECT ANSWER The bleeding sequence
for all systems begins with the left rear wheel." "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? - CORRECT ANSWER A plugged booster air
breather"
"If vacuum is present on both sides of the diaphragm in a brake booster: - CORRECT ANSWER The
brakes are being released"
