T4 ASE BRAKES (MEDIUM/HEAVY
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS
A drum is chattering on the brake lathe. This could be a result of
a. failure to install the dampening belt
b. cutting too slowly
c. dull cutting blades
d. cutting speed too fast - ANSWER - A : failure to install the dampening belt
why : a missing dampening belt could cause the drum to vibrate while on the lathe. this vibration can
cause the drum to bounce on the cutting tip and make a chattering noise
A vehicle equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of
the following could be the cause?
a. low brake fluid
b. air in the brake fluid
c. low power steering fluid
d. an overtightened power steering belt - ANSWER - C : low power steering fluid
why : low power steering fluid can cause the booster to provide very little if any boost
Which of the following could cause excessive noise braking?
,a. worn wheel cylinders
b. worn caliper pistons
c. seized caliper slides
d. missing clips - ANSWER - D : missing clips
why : missing anti-rattle clips could cause excessive noise while braking
A vehicle equipped with a "hill holding" option has an ABS code. Which tool would most likely be used to
check the wheel speed sensor?
a. AC volt meter
b. Ohm meter
c. Scan tool
d. Ammeter - ANSWER - C : scan tool
why : a scan tool or oscilloscope can be used to test a signal from a digital when speed sensor
The brake system has a soft, sinking pedal with the engine running. The brake fluid level is at the correct
height. Which of the following could be the cause?
a. a restricted vacuum hose
b. a leaking master cylinder
c. a bypassing master cylinder
d. a stuck open vacuum check valve - ANSWER - C : a bypassing master cylinder
why : a bypassing master cylinder would cause a low pedal and would not cause a loss of fluid
Technician A says the pins should be driven in with a brass hammer. Technician B says the pins should be
lubricated with brake fluid. Who is correct? ( pg. 47 )
, a. A
b. B
c. A & B
d. neither A OR B - ANSWER - D : neither A OR B
why : neither technician is correct. this style of pin should be installed with a torx or hex head socket
Technician A says a hydro-boost system can use the power steering pump to operate the booster.
Technician B says a hydro-boost system can use engine vacuum to operate the booster. Who is correct?
( pg. 47 )
a. A
b. B
c. A & B
d. neither A & B - ANSWER - A : only A
why : only tech A is correct. a hydro-boost system uses hydraulic pressure to create boost
A disc brake caliper is dragging. All of the following could be the cause EXCEPT
a. binding pins
b. sticking piston
c. binding caliper
d. worn brake pads - ANSWER - D : worn brake pads
why : worn brake pads will not cause the brakes to drag
Which operation is being performed in the illustration? ( pg. 48 )
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS
A drum is chattering on the brake lathe. This could be a result of
a. failure to install the dampening belt
b. cutting too slowly
c. dull cutting blades
d. cutting speed too fast - ANSWER - A : failure to install the dampening belt
why : a missing dampening belt could cause the drum to vibrate while on the lathe. this vibration can
cause the drum to bounce on the cutting tip and make a chattering noise
A vehicle equipped with a hydro-boost brake system has a hard pedal with little braking action. Which of
the following could be the cause?
a. low brake fluid
b. air in the brake fluid
c. low power steering fluid
d. an overtightened power steering belt - ANSWER - C : low power steering fluid
why : low power steering fluid can cause the booster to provide very little if any boost
Which of the following could cause excessive noise braking?
,a. worn wheel cylinders
b. worn caliper pistons
c. seized caliper slides
d. missing clips - ANSWER - D : missing clips
why : missing anti-rattle clips could cause excessive noise while braking
A vehicle equipped with a "hill holding" option has an ABS code. Which tool would most likely be used to
check the wheel speed sensor?
a. AC volt meter
b. Ohm meter
c. Scan tool
d. Ammeter - ANSWER - C : scan tool
why : a scan tool or oscilloscope can be used to test a signal from a digital when speed sensor
The brake system has a soft, sinking pedal with the engine running. The brake fluid level is at the correct
height. Which of the following could be the cause?
a. a restricted vacuum hose
b. a leaking master cylinder
c. a bypassing master cylinder
d. a stuck open vacuum check valve - ANSWER - C : a bypassing master cylinder
why : a bypassing master cylinder would cause a low pedal and would not cause a loss of fluid
Technician A says the pins should be driven in with a brass hammer. Technician B says the pins should be
lubricated with brake fluid. Who is correct? ( pg. 47 )
, a. A
b. B
c. A & B
d. neither A OR B - ANSWER - D : neither A OR B
why : neither technician is correct. this style of pin should be installed with a torx or hex head socket
Technician A says a hydro-boost system can use the power steering pump to operate the booster.
Technician B says a hydro-boost system can use engine vacuum to operate the booster. Who is correct?
( pg. 47 )
a. A
b. B
c. A & B
d. neither A & B - ANSWER - A : only A
why : only tech A is correct. a hydro-boost system uses hydraulic pressure to create boost
A disc brake caliper is dragging. All of the following could be the cause EXCEPT
a. binding pins
b. sticking piston
c. binding caliper
d. worn brake pads - ANSWER - D : worn brake pads
why : worn brake pads will not cause the brakes to drag
Which operation is being performed in the illustration? ( pg. 48 )
