T4 ASE BRAKES (MEDIUM/HEAVY
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS
The brakes are dragging on a vehicle. this could be cause by
a. overfilled master cylinder reservoir
b. low vacuum to the boost
c. bypassing master cylinder
d. quick take-up valve stuck open - ANSWER - A : overfilled master cylinder reservoir
why : an overfilled master cylinder reservoir cylinder would not allow for fluid expansion. this would
cause the brakes to self apply as the fluid expanded as result in brake drag
The brake pads are worn at an angle on a vehicle with a sliding brake caliper system. which of the
following is most likely the cause?
a. worn caliper piston
b. worn caliper bushings
c. leaking caliper seal
d. leaking caliper boot - ANSWER - B : worn caliper bushings
why : worn bushings can cause the caliper to cock during operation. this could cause the pads to wear at
an angle
,A diagnostic trouble code is set for an open wheel speed sensor on the left front sensor. The technician
measures the resistance at the sensor and finds it to be within specification. Which of the following is
the most likely cause for the wheel speed sensor code?
a. faulty ABS computer
b. open fuse
c. open wiring from the computer to the wheel speed sensor
d. shorted left front ABS modulator valve - ANSWER - C : open wiring from the computer to the wheel
speed sensor
why : an open in the wiring from the sensor to the computer would cause a diagnostic trouble code to
be set and the sensor to have the correct resistance
The brake warning lamp pictured above (pg. 56) stays on any time the ignition switch is on. Tech A says
this could be caused by a poor ground at the parking brake switch. Tech B says this could be caused by a
poor ground at the brake warning lamp switch. Who is correct?
a. A only
b. B only
c. A & B
d. neither A or B - ANSWER - D : neither A or B
why : neither technician is correct. there is a ground present at all times to cause the light to be on all
the time
Which of the following is true concerning the above caliper? ( pg. 57 )
a. this caliper incorporates the parking brake
b. this caliper can only be used on the front
c. this caliper can only be used with Type 5 brake fluid
d. this caliper must be replaced at each brake pad replacement - ANSWER - A : this caliper incorporates
the parking brake
, why : ^^^
Tech A says a double flare line should be replaced with an ISO flare line. Tech B says an ISO flare line
should be replaced with a double flare line. Who is correct?
a. A only
b. B only
c. A & B
d. neither - ANSWER - D : neither
why : neither technician is correct
While testing the system shown above ( pg. 58 ), the technician finds there is no assist from the booster
after the engine is shut off. Which of the following is the most likely correct?
a. a faulty back-up EH pump
b. a faulty accumulator
c. a bypassing master cylinder
d. a bypassing brake booster - ANSWER - A : a faulty back-up EH pump
why : the accumulator could be faulty and not storing pressure
A customer is concerned that under heavy acceleration on dry pavement the traction control light
comes on and the throttle momentarily becomes unresponsive. Which of the following is the most likely
cause?
a. a tire has lost traction
b. the accelerator pedal position (APP) sensor is faulty
c. the throttle position sensor (TPS) is faulty
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS
The brakes are dragging on a vehicle. this could be cause by
a. overfilled master cylinder reservoir
b. low vacuum to the boost
c. bypassing master cylinder
d. quick take-up valve stuck open - ANSWER - A : overfilled master cylinder reservoir
why : an overfilled master cylinder reservoir cylinder would not allow for fluid expansion. this would
cause the brakes to self apply as the fluid expanded as result in brake drag
The brake pads are worn at an angle on a vehicle with a sliding brake caliper system. which of the
following is most likely the cause?
a. worn caliper piston
b. worn caliper bushings
c. leaking caliper seal
d. leaking caliper boot - ANSWER - B : worn caliper bushings
why : worn bushings can cause the caliper to cock during operation. this could cause the pads to wear at
an angle
,A diagnostic trouble code is set for an open wheel speed sensor on the left front sensor. The technician
measures the resistance at the sensor and finds it to be within specification. Which of the following is
the most likely cause for the wheel speed sensor code?
a. faulty ABS computer
b. open fuse
c. open wiring from the computer to the wheel speed sensor
d. shorted left front ABS modulator valve - ANSWER - C : open wiring from the computer to the wheel
speed sensor
why : an open in the wiring from the sensor to the computer would cause a diagnostic trouble code to
be set and the sensor to have the correct resistance
The brake warning lamp pictured above (pg. 56) stays on any time the ignition switch is on. Tech A says
this could be caused by a poor ground at the parking brake switch. Tech B says this could be caused by a
poor ground at the brake warning lamp switch. Who is correct?
a. A only
b. B only
c. A & B
d. neither A or B - ANSWER - D : neither A or B
why : neither technician is correct. there is a ground present at all times to cause the light to be on all
the time
Which of the following is true concerning the above caliper? ( pg. 57 )
a. this caliper incorporates the parking brake
b. this caliper can only be used on the front
c. this caliper can only be used with Type 5 brake fluid
d. this caliper must be replaced at each brake pad replacement - ANSWER - A : this caliper incorporates
the parking brake
, why : ^^^
Tech A says a double flare line should be replaced with an ISO flare line. Tech B says an ISO flare line
should be replaced with a double flare line. Who is correct?
a. A only
b. B only
c. A & B
d. neither - ANSWER - D : neither
why : neither technician is correct
While testing the system shown above ( pg. 58 ), the technician finds there is no assist from the booster
after the engine is shut off. Which of the following is the most likely correct?
a. a faulty back-up EH pump
b. a faulty accumulator
c. a bypassing master cylinder
d. a bypassing brake booster - ANSWER - A : a faulty back-up EH pump
why : the accumulator could be faulty and not storing pressure
A customer is concerned that under heavy acceleration on dry pavement the traction control light
comes on and the throttle momentarily becomes unresponsive. Which of the following is the most likely
cause?
a. a tire has lost traction
b. the accelerator pedal position (APP) sensor is faulty
c. the throttle position sensor (TPS) is faulty
