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SOS Mechanic Certification- Brakes Exam with ANSWERs Most 1995 & newer vehicles use which of the following types of wheel bearings on non-drive wheels?
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:
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:
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:
ANSWER: A hard pedal feel requiring very high pedal effort to
stop
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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?
ANSWER: A plugged axle
(Note: Typically, this would be caused by a failed axle seal, but
"plugged axle" may imply a vent issue leading to pressure buildup and seal failure.)
Which of the following incorrect service procedures will cause brake lock-up?
ANSWER: Master cylinder push rod adjusted too long
Which of the following describes the proper way to depressurize an ABS system?
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:
ANSWER: Technician used the parking brake to adjust shoes
and the cable is stuck
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When turning brake drums:
ANSWER: Use a dampening strap to reduce chatter
Which of the following is NOT a necessary drum brake measurement?
ANSWER: Run-out
(Run-out is critical for rotors, not typically drums; necessary drum measurements include diameter and out-of-round.)
On a 3-channel system, which wheels are on the same circuit?
ANSWER: Both rear wheels
One way to test an ABS wheel speed signal is to use _____ on your digital multimeter.
ANSWER: AC volts
The key input for the ABS control module comes from the:
ANSWER: Wheel speed sensors
ABS speed sensor and sensor rings:
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ANSWER: Should not be hammered or tapped on and should
always be replaced as a matched set
Flexible brake hoses should be replaced:
ANSWER: When dampness is evident on the hose
Which of the following should be used to check for rotor thickness variation?
ANSWER: Micrometer
After rebuilding a master cylinder, the rod between the master
cylinder and booster should be:
ANSWER: 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?
ANSWER: 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?