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2025 SOS Series: Brake Mechanic
Certification Test Prep with 80 Practice
Questions & Correct Answers
Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? -
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
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
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 depressurized 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 use the parking brake to adjust shoes and the cable is stuck
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
On a 3-channel system, which wheels are on the same circuit? - ANSWER-both rear wheels
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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: - 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? - ANSWER-Inspect disc brake pads for excessive wear
Which of the following is true about most properly functioning anti-lock brake systems? - 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? - 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: - ANSWER-a
"spaced-saver" spare tire is being used and mismatched tires are being installed
What does a load sensing proportioning valve do? - 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? - ANSWER-Glazed brake pads
Which of the following is a true statement about proportioning valves? - ANSWER-They provide better
braking balance during hard stops
A properly functioning load sensing proportioning valve will: - 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? - ANSWER-A certain amount of pressure is
maintained by the metering valve
2025 SOS Series: Brake Mechanic
Certification Test Prep with 80 Practice
Questions & Correct Answers
Most 1995 & newer vehicles use which of the following types of wheels bearings on non-drive wheel? -
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
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
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 depressurized 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 use the parking brake to adjust shoes and the cable is stuck
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
On a 3-channel system, which wheels are on the same circuit? - ANSWER-both rear wheels
, 2|Page
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: - 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? - ANSWER-Inspect disc brake pads for excessive wear
Which of the following is true about most properly functioning anti-lock brake systems? - 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? - 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: - ANSWER-a
"spaced-saver" spare tire is being used and mismatched tires are being installed
What does a load sensing proportioning valve do? - 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? - ANSWER-Glazed brake pads
Which of the following is a true statement about proportioning valves? - ANSWER-They provide better
braking balance during hard stops
A properly functioning load sensing proportioning valve will: - 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? - ANSWER-A certain amount of pressure is
maintained by the metering valve
