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
The brake warning light on the dash stays on all the time, which of the following could be the cause of
the problem? - (correct Answer) - A problem in the hydraulic circuit
Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? -
(correct Answer) - Open wheel sensor circuit
The brake lights on a car do not light when the brake pedal is depressed, which of the following is the
LEAST likely cause of the problem? - (correct Answer) - A burned out bulb.
Which of the following incorrect service procedures could cause brake pedal pulsation? - (correct
Answer) - incorrect run-out on the car brake lathe
What type of rotor surface provides the best braking with new pads? - (correct Answer) - A smooth, flat
surface
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
The brake warning light on the dash stays on all the time, which of the following could be the cause of
the problem? - (correct Answer) - A problem in the hydraulic circuit
Which of the following would be the LEAST likely cause for an intermittent problem in an ABS system? -
(correct Answer) - Open wheel sensor circuit
The brake lights on a car do not light when the brake pedal is depressed, which of the following is the
LEAST likely cause of the problem? - (correct Answer) - A burned out bulb.
Which of the following incorrect service procedures could cause brake pedal pulsation? - (correct
Answer) - incorrect run-out on the car brake lathe
What type of rotor surface provides the best braking with new pads? - (correct Answer) - A smooth, flat
surface
