Page 1 of 45
T4 BRAKES ASE QUESTIONBANK ALL
QUESTIONS AND CORRECT DETAILED
ANSWERS TOP RATED VERSION FOR 2024-
2025 ALREADY A GRADED AND EXPERT
APPROVED | NEW AND REVISED
1.Blue marks on a disc brake rotor indicate which of the following:
A. excessive heat
B. identification marks
C. resurfacing specifications
D. excessive cooling - ANSWER- . The correct answer is A. Blue
discoloration indicates a change in the internal crystalline structure of
the metal. The rotor at one time was excessively hot, probably due to a
malfunction in the brake system.
2. The Driver Vehicle Inspection Report DVIR should be submitted :
A. according to the vehicle maintenance schedule
B. when a failure occurs
C. weekly
D. daily - ANSWER- The correct answer is D. Federal Motor Vehicle
Safety Standards ( FMVSS ) require the driver to submit a DVIR to their
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motor carrier or owner at the end of each day . The DVIR is used to
identify defects or deficiencies that would result in a mechanical
breakdown or effect the safe operation of a vehicle Once a driver
submits the DVIR , a motor carrier or its agent must investigate and
repair the defect or deficiency .
3. Which of the following cannot cause a drum on an air - braked vehicle
to overheat ?
A. an over - tightened brake adjuster at that wheel
B. under - adjusted brake ( s ) elsewhere on the vehicle
C. too - high governor cut - out pressure
D. driving downhill in too high a gear. - ANSWER- 3. The correct
answer is C. The governor controls the air compressor output by
unloading or cycling it . It has no direct effect on the mechanical brake
parts . While the pressure setting is important to maintain air brake
system pressure within acceptable limits , an incorrect setting will not
cause the drum on an air - braked vehicle to overheat . All other choices
given , however , will cause overheating problems .
4. All the brakes drag on a truck with hydraulic brakes . Which of the
following could be the cause ? A. air in the hydraulic system
B. too high a vacuum supply to the power brake booster
C. a leaking secondary cup in the master cylinder
D. no brake pedal free travel - ANSWER- 4. The correct answer is D.
Only a brake pedal with no free travel will cause all of the brakes to drag
. Answer A - air in the hydraulic system , will cause a spongy pedal ,
while answer B - too high a vacuum to the power booster , won't affect
brake drag at all . Answer C , a leaking secondary cup in the master
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cylinder , could increase pedal travel , but won't cause the brakes to drag
.
5. Which of the following could cause a pulsating brake pedal on a truck
with hydraulic brakes ?
A. zero brake pedal free travel
B. glazed linings
C. an out - of - round brake drum
D. a frozen wheel cylinder piston. - ANSWER- 5. The correct answer is
C. Of the choices given , only an out - of - round brake drum can cause
pulsation in a hydrau lic brake system . Answer A , zero brake pedal free
travel , will cause a dragging brake condition , but not pulsation .
Answer B , glazed linings , will affect stopping performance and noise ,
and answer D , a frozen wheel cylinder , will de grade stopping
performance , but will not cause pulsation.
6. Air pressure gauges change an air pressure signal into an electronic
voltage signal using which of the following components ?
A. inductor
B. capacitor
C. transducer
D. regulator - ANSWER- 6. The correct answer is C. An element inside
an air pressure transducer responds to air pressure increase or decrease,
and the transducer converts that pressure differentiation into a voltage
signal, which is displayed in a proportionate reading on the dash gauge.
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7. Technician A says that linings worn too thin on an air - braked vehicle
can cause the S - camshaft to roll over . Technician B says this condition
can cause excess brake pedal travel . Who is right ?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER- 7. The correct answer is A. The brake
adjuster is connected to a shaft that runs perpendicular to the plane
formed by the pushrod and slack adjuster. As the pushrod is extended,
the shaft rotates. The shaft, in turn, is connected to an S-shaped cam
between the brake shoes. As the shaft rotates, so does the cam. The
brake shoes are forced apart and against the brake drum, creating the
friction needed to slow the vehicle. Thin brake linings can allow the S-
cam to roll over, but will not affect brake pedal travel.
8. Spring brakes on an air - braked vehicle must be able to hold the
vehicle facing uphill or downhill on what percent grade ?
A. 10 %
B. 20 %
C. 30 %
D. 40 % - ANSWER- 8. The correct answer is B. Per Federal Motor
Vehicle Safety Standard (FMVSS) 121, the parking brakes must be able
to hold a vehicle, loaded to its gross weight rating, stationary on a
smooth, dry, concrete roadway, facing uphill or downhill on a 20%
grade. In the emergency mode, the parking brakes must be able to exert
a retarding force equal to 28% of the gross axle rating.
T4 BRAKES ASE QUESTIONBANK ALL
QUESTIONS AND CORRECT DETAILED
ANSWERS TOP RATED VERSION FOR 2024-
2025 ALREADY A GRADED AND EXPERT
APPROVED | NEW AND REVISED
1.Blue marks on a disc brake rotor indicate which of the following:
A. excessive heat
B. identification marks
C. resurfacing specifications
D. excessive cooling - ANSWER- . The correct answer is A. Blue
discoloration indicates a change in the internal crystalline structure of
the metal. The rotor at one time was excessively hot, probably due to a
malfunction in the brake system.
2. The Driver Vehicle Inspection Report DVIR should be submitted :
A. according to the vehicle maintenance schedule
B. when a failure occurs
C. weekly
D. daily - ANSWER- The correct answer is D. Federal Motor Vehicle
Safety Standards ( FMVSS ) require the driver to submit a DVIR to their
, Page 2 of 45
motor carrier or owner at the end of each day . The DVIR is used to
identify defects or deficiencies that would result in a mechanical
breakdown or effect the safe operation of a vehicle Once a driver
submits the DVIR , a motor carrier or its agent must investigate and
repair the defect or deficiency .
3. Which of the following cannot cause a drum on an air - braked vehicle
to overheat ?
A. an over - tightened brake adjuster at that wheel
B. under - adjusted brake ( s ) elsewhere on the vehicle
C. too - high governor cut - out pressure
D. driving downhill in too high a gear. - ANSWER- 3. The correct
answer is C. The governor controls the air compressor output by
unloading or cycling it . It has no direct effect on the mechanical brake
parts . While the pressure setting is important to maintain air brake
system pressure within acceptable limits , an incorrect setting will not
cause the drum on an air - braked vehicle to overheat . All other choices
given , however , will cause overheating problems .
4. All the brakes drag on a truck with hydraulic brakes . Which of the
following could be the cause ? A. air in the hydraulic system
B. too high a vacuum supply to the power brake booster
C. a leaking secondary cup in the master cylinder
D. no brake pedal free travel - ANSWER- 4. The correct answer is D.
Only a brake pedal with no free travel will cause all of the brakes to drag
. Answer A - air in the hydraulic system , will cause a spongy pedal ,
while answer B - too high a vacuum to the power booster , won't affect
brake drag at all . Answer C , a leaking secondary cup in the master
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cylinder , could increase pedal travel , but won't cause the brakes to drag
.
5. Which of the following could cause a pulsating brake pedal on a truck
with hydraulic brakes ?
A. zero brake pedal free travel
B. glazed linings
C. an out - of - round brake drum
D. a frozen wheel cylinder piston. - ANSWER- 5. The correct answer is
C. Of the choices given , only an out - of - round brake drum can cause
pulsation in a hydrau lic brake system . Answer A , zero brake pedal free
travel , will cause a dragging brake condition , but not pulsation .
Answer B , glazed linings , will affect stopping performance and noise ,
and answer D , a frozen wheel cylinder , will de grade stopping
performance , but will not cause pulsation.
6. Air pressure gauges change an air pressure signal into an electronic
voltage signal using which of the following components ?
A. inductor
B. capacitor
C. transducer
D. regulator - ANSWER- 6. The correct answer is C. An element inside
an air pressure transducer responds to air pressure increase or decrease,
and the transducer converts that pressure differentiation into a voltage
signal, which is displayed in a proportionate reading on the dash gauge.
, Page 4 of 45
7. Technician A says that linings worn too thin on an air - braked vehicle
can cause the S - camshaft to roll over . Technician B says this condition
can cause excess brake pedal travel . Who is right ?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER- 7. The correct answer is A. The brake
adjuster is connected to a shaft that runs perpendicular to the plane
formed by the pushrod and slack adjuster. As the pushrod is extended,
the shaft rotates. The shaft, in turn, is connected to an S-shaped cam
between the brake shoes. As the shaft rotates, so does the cam. The
brake shoes are forced apart and against the brake drum, creating the
friction needed to slow the vehicle. Thin brake linings can allow the S-
cam to roll over, but will not affect brake pedal travel.
8. Spring brakes on an air - braked vehicle must be able to hold the
vehicle facing uphill or downhill on what percent grade ?
A. 10 %
B. 20 %
C. 30 %
D. 40 % - ANSWER- 8. The correct answer is B. Per Federal Motor
Vehicle Safety Standard (FMVSS) 121, the parking brakes must be able
to hold a vehicle, loaded to its gross weight rating, stationary on a
smooth, dry, concrete roadway, facing uphill or downhill on a 20%
grade. In the emergency mode, the parking brakes must be able to exert
a retarding force equal to 28% of the gross axle rating.
