ASE BRAKES TEST EXAM QUESTIONS WITH CORRECT
SOLUTIONS
A truck has a pulsating brake pedal. Technician A says excessive brake rotor thickness variation could be
the cause and should be checked with a micrometer. Technician B says that excessive brake rotor run
out could be the cause and should be checked using a dial
indicator.
Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER - C. Both A and B ( Either of these conditions can cause pedal pulsation,
and the instruments recommended by the Technicians are appropriate for checking the rotors.)
Which of the following could cause the brakes on a truck to wear too fast?
A. Glazed drums
B. Wrong linings installed
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high - ANSWER - B. Wrong linings installed (The wrong lining for the
application may be the problem)
Which of the following could cause one brake on a truck to wear faster than the others?
A.Mismatched service brake chambers
B. Mismatched parking brake chambers
C.Low air pressure in the service tanks
, D. Governor cut-out pressure too low - ANSWER - A. Mismatched service brake chambers (would apply
unequal brake application pressure from side to side, which would cause one brake to wear faster)
Referring to the figure above, what force is used to apply the foundation brake wheel cylinders?
A. Hydraulic, from the power steering reservoir
B. Mechanical
C. Electrical
D. Hydraulic, from the master cylinder - ANSWER - D. Hydraulic, from the master cylinder (The figure
shows a typical hydraulic power booster circuit in which the function of the power booster is to assist
pedal braking effort. However, the power booster hydraulic circuit and the actual brake hydraulic circuit
are quite separate, so the actual force used to effect braking is hydraulic, from the master cylinder.)
There is an audible air leak from under the dash when the foot valve is applied. Technician A says the
double-check valve may be faulty. Technician B says the single-check valve may be faulty. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER - A. A only ( A leaking double-check valve could allow air to flow to the foot
valve and out the open exhaust)
On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero when the
wet air tank is drained. Technician A says the one-way check valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER - A. A only (The one way check valve should protect the secondary tank.
The check valve is leaking.)
SOLUTIONS
A truck has a pulsating brake pedal. Technician A says excessive brake rotor thickness variation could be
the cause and should be checked with a micrometer. Technician B says that excessive brake rotor run
out could be the cause and should be checked using a dial
indicator.
Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER - C. Both A and B ( Either of these conditions can cause pedal pulsation,
and the instruments recommended by the Technicians are appropriate for checking the rotors.)
Which of the following could cause the brakes on a truck to wear too fast?
A. Glazed drums
B. Wrong linings installed
C. Low air pressure in the service tanks
D. Governor cut-out pressure too high - ANSWER - B. Wrong linings installed (The wrong lining for the
application may be the problem)
Which of the following could cause one brake on a truck to wear faster than the others?
A.Mismatched service brake chambers
B. Mismatched parking brake chambers
C.Low air pressure in the service tanks
, D. Governor cut-out pressure too low - ANSWER - A. Mismatched service brake chambers (would apply
unequal brake application pressure from side to side, which would cause one brake to wear faster)
Referring to the figure above, what force is used to apply the foundation brake wheel cylinders?
A. Hydraulic, from the power steering reservoir
B. Mechanical
C. Electrical
D. Hydraulic, from the master cylinder - ANSWER - D. Hydraulic, from the master cylinder (The figure
shows a typical hydraulic power booster circuit in which the function of the power booster is to assist
pedal braking effort. However, the power booster hydraulic circuit and the actual brake hydraulic circuit
are quite separate, so the actual force used to effect braking is hydraulic, from the master cylinder.)
There is an audible air leak from under the dash when the foot valve is applied. Technician A says the
double-check valve may be faulty. Technician B says the single-check valve may be faulty. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER - A. A only ( A leaking double-check valve could allow air to flow to the foot
valve and out the open exhaust)
On a straight truck equipped with air brakes, the secondary tank pressure gauge falls to zero when the
wet air tank is drained. Technician A says the one-way check valve may be faulty. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B - ANSWER - A. A only (The one way check valve should protect the secondary tank.
The check valve is leaking.)
