SOS Mechanic Certification- Brakes Exam with
correct Answers {2024/2025}
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
correct Answers {2024/2025}
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
