2
T4 ASE Test questions with verified detailed answers
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1. An air leak at point 'X' in the system shown above would cause which of these to leak
|| || || || || || || || || || || || || || || || || || ||
down?
A. #1 tank only
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B. #2 tank only
|| || ||
C. #2 and #4 tanks only
|| || || || ||
D. The entire system - ✔✔1. The correct answer is A. If you look closely at the diagram, you
|| || || || || || || || || || || || || || || || || ||
will notice two check-valves at tanks 2 and
|| || || || || || || ||
3. An air leak at the point indicated would be isolated to tank 1 only; therefore only tank 1
|| || || || || || || || || || || || || || || || || || ||
would lose air pressure in the circuit. || || || || || ||
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 - ✔✔2. The correct answer is D. Federal Motor Vehicle Safety Standards (FMVSS)
|| || || || || || || || || || || || || || ||
require the driver to submit a DVIR to their 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
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B. under-adjusted brake(s) elsewhere on the vehicle
|| || || || || ||
C. too-high governor cut-out pressure
|| || || ||
,2
D. driving downhill in too high a gear - ✔✔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 - ✔✔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 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 - ✔✔5. The correct answer is C. Of the choices given, only
|| || || || || || || || || || || || || || || || ||
an out-of-round brake drum can cause pulsation in a hydraulic 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 degrade stopping performance, but will not cause pulsation
|| || || || || || || || || || ||
, 2
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 - ✔✔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. ||
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 - ✔✔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% - ✔✔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,
|| || || || || || || || || || || || || || || || ||
T4 ASE Test questions with verified detailed answers
|| || || || || || ||
1. An air leak at point 'X' in the system shown above would cause which of these to leak
|| || || || || || || || || || || || || || || || || || ||
down?
A. #1 tank only
|| || ||
B. #2 tank only
|| || ||
C. #2 and #4 tanks only
|| || || || ||
D. The entire system - ✔✔1. The correct answer is A. If you look closely at the diagram, you
|| || || || || || || || || || || || || || || || || ||
will notice two check-valves at tanks 2 and
|| || || || || || || ||
3. An air leak at the point indicated would be isolated to tank 1 only; therefore only tank 1
|| || || || || || || || || || || || || || || || || || ||
would lose air pressure in the circuit. || || || || || ||
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 - ✔✔2. The correct answer is D. Federal Motor Vehicle Safety Standards (FMVSS)
|| || || || || || || || || || || || || || ||
require the driver to submit a DVIR to their 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
|| || || ||
,2
D. driving downhill in too high a gear - ✔✔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 - ✔✔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 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 - ✔✔5. The correct answer is C. Of the choices given, only
|| || || || || || || || || || || || || || || || ||
an out-of-round brake drum can cause pulsation in a hydraulic 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 degrade stopping performance, but will not cause pulsation
|| || || || || || || || || || ||
, 2
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 - ✔✔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. ||
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 - ✔✔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% - ✔✔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,
|| || || || || || || || || || || || || || || || ||
