SOS Mechanic Certification- Brakes
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
After rebuilding a master cylinder, the rod between the master cylinder and booster should
be: - correct 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? - correct
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? - correct answer-Inspect disc brake pads for excessive wear
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
What does a load sensing proportioning valve do? - correct answer-It increases the hydraulic
pressure during braking at the rear wheel cylinders when the vehicle is loaded
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
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
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