SOS MECHANIC CERTIFICATION 2026
BRAKES QUESTIONS AND DETAILED
CORRECT ANSWERS | A+ GRADE
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
which of the following is a quick way to isolated a defective
master cylinder? There are no external leaks in the
system. Correct Answer pump up the brake pedal, then
hold it firm. if the pedal slowly drops to the floor, the
master cylinder may be defective.
A common cause of pedal pulsation during brake
application is: Correct Answer NOT caused by improperly
torqued wheels, damaged backing plates, or lubricated
shims
BRAKES QUESTIONS AND DETAILED
CORRECT ANSWERS | A+ GRADE
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
which of the following is a quick way to isolated a defective
master cylinder? There are no external leaks in the
system. Correct Answer pump up the brake pedal, then
hold it firm. if the pedal slowly drops to the floor, the
master cylinder may be defective.
A common cause of pedal pulsation during brake
application is: Correct Answer NOT caused by improperly
torqued wheels, damaged backing plates, or lubricated
shims
