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SOS Mechanic Certification- Brakes
Questions and Correct Answers
Most 1995 & newer vehicles use which of the following types of
wheels bearings on non-drive wheel? Ans: 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: Ans: 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: Ans: Smaller and
goes towards the front of the car.
A cracked or torn vacuum diaphragm in a brake power booster
would most likely cause: Ans: 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?
Ans: A plugged axle
Which of the following incorrect service procedures will cause
brake lock-up? Ans: master cylinder push rod adjusted too long
Which of the following describes the proper way to depressurized
an ABS system? Ans: Pump the brake pedal at least 25 times (or
more, depending on the manufacturer's recommendation) with the
ignition off.
© 2025 All rights reserved
, 2 | Page
The rear brakes are dragging after having new linings installed and
the drums machined. the most likely cause is the: Ans: technician
use the parking brake to adjust shoes and the cable is stuck
When turning brake drums: Ans: use a dampening strap to reduce
chatter
Which of the following is NOT a necessary drum brake
measurement? Ans: run-out
On a 3-channel system, which wheels are on the same circuit? Ans:
both rear wheels
One way to test an ABS wheel speed signal is to use _____ on your
digital multimeter. Ans: AC volts
The key input for the ABS control module comes from the: Ans:
wheel speed sensors
ABS speed sensor and sensor rings: Ans: should not be hammered
or tapped on and should always be replaced as a matched set
Flexible brake hoses should be replaced: Ans: when dampness is
evident on the hose
Which of the following should be used to check for rotor thickness
variation: Ans: Micrometer
After rebuilding a master cylinder, the rod between the master
cylinder and booster should be: Ans: adjusted properly
Upon inspecting brake fluid condition, the technician observes the
diaphragm in the master cylinder cup is swollen. Which of the
© 2025 All rights reserved
SOS Mechanic Certification- Brakes
Questions and Correct Answers
Most 1995 & newer vehicles use which of the following types of
wheels bearings on non-drive wheel? Ans: 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: Ans: 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: Ans: Smaller and
goes towards the front of the car.
A cracked or torn vacuum diaphragm in a brake power booster
would most likely cause: Ans: 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?
Ans: A plugged axle
Which of the following incorrect service procedures will cause
brake lock-up? Ans: master cylinder push rod adjusted too long
Which of the following describes the proper way to depressurized
an ABS system? Ans: Pump the brake pedal at least 25 times (or
more, depending on the manufacturer's recommendation) with the
ignition off.
© 2025 All rights reserved
, 2 | Page
The rear brakes are dragging after having new linings installed and
the drums machined. the most likely cause is the: Ans: technician
use the parking brake to adjust shoes and the cable is stuck
When turning brake drums: Ans: use a dampening strap to reduce
chatter
Which of the following is NOT a necessary drum brake
measurement? Ans: run-out
On a 3-channel system, which wheels are on the same circuit? Ans:
both rear wheels
One way to test an ABS wheel speed signal is to use _____ on your
digital multimeter. Ans: AC volts
The key input for the ABS control module comes from the: Ans:
wheel speed sensors
ABS speed sensor and sensor rings: Ans: should not be hammered
or tapped on and should always be replaced as a matched set
Flexible brake hoses should be replaced: Ans: when dampness is
evident on the hose
Which of the following should be used to check for rotor thickness
variation: Ans: Micrometer
After rebuilding a master cylinder, the rod between the master
cylinder and booster should be: Ans: adjusted properly
Upon inspecting brake fluid condition, the technician observes the
diaphragm in the master cylinder cup is swollen. Which of the
© 2025 All rights reserved
