T4 Brake Test SET I
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1. 1. An air leak at 'tank 1' in the system would A. #1 tank only
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
2. 2. The Driver Vehicle Inspection Report (DVIR) D. daily
should be submitted:
A. according to the vehicle maintenance
schedule
B. when a failure occurs
C. weekly
D. daily
3. 3. Which of the following cannot cause a drum C. too-high governor cut-out pres-
on an air-braked vehicle to overheat? sure
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
4. 4. All the brakes drag on a truck with hydraulic D. no brake pedal free travel
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 cylin-
, T4 Brake Test SET I
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der
D. no brake pedal free travel
5. 5. Which of the following could cause a pul- C. an out-of-round brake drum
sating 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
6. 6. Air pressure gauges change an air pressure C. transducer
signal into an electronic voltage signal using
which of the following components?
A. inductor
B. capacitor
C. transducer
D. regulator
7. 7. Technician A says that linings worn too A. Technician A only
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
8. 8. Spring brakes on an air-braked vehicle must B. 20%
be able to hold the vehicle facing uphill or
downhill on what percent grade?
A. 10%
, T4 Brake Test SET I
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B. 20%
C. 30%
D. 40%
9. 9. The driver of a truck with hydraulic brakes C. Both A and B
says the pedal reserve is too low. Technician
A says the brakes could be out of adjustment.
Technician B says one brake system may have
failed. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B
10. 10. The parking brakes fail to apply on a truck D. Neither A or B
with air brakes. Technician A says this could
be caused by low air pressure in the spring
brake chamber. Technician B says this could be
caused by a ruptured spring brake diaphragm.
Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B
11. 11. Technician A says the low-pressure warning D. Neither A or B
indicator is located on the secondary reservoir
tank. Technician B says the low-pressure warn-
ing indicator operates once system air pres-
sure falls below 80 psi. Who is right?
A. Technician A
B. Technician B
, T4 Brake Test SET I
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C. Both A and B
D. Neither A or B
12. 12. The warning light on a truck with an A. misadjusted wheel sensor
anti-lock brake system lights when the truck
is started. When the truck is moving, the light
stays on. Which of the following could be the
cause?
A. misadjusted wheel sensor
B. bad air release solenoid
C. blown fail-safe monitor fuse
D. bad warning light relay
13. 13. The driver of a truck with air brakes says it A. The quick release valve exhaust
has poor stopping power. Any of these could port is plugged.
be the cause EXCEPT:
A. The quick-release valve exhaust port is
plugged.
B. The air pressure is too low.
C. The service line is restricted.
D. The brakes are adjusted incorrectly.
14. 14. Technician A says brake shoe oil contami- C. Both A and B
nation
should be no more than 10% of the lining sur-
face.
Technician B says oil contamination can lead to
brake
imbalance. Who is right?
A. Technician A only
B. Technician B only
Study online at https://quizlet.com/_c8ntfj
1. 1. An air leak at 'tank 1' in the system would A. #1 tank only
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
2. 2. The Driver Vehicle Inspection Report (DVIR) D. daily
should be submitted:
A. according to the vehicle maintenance
schedule
B. when a failure occurs
C. weekly
D. daily
3. 3. Which of the following cannot cause a drum C. too-high governor cut-out pres-
on an air-braked vehicle to overheat? sure
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
4. 4. All the brakes drag on a truck with hydraulic D. no brake pedal free travel
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 cylin-
, T4 Brake Test SET I
Study online at https://quizlet.com/_c8ntfj
der
D. no brake pedal free travel
5. 5. Which of the following could cause a pul- C. an out-of-round brake drum
sating 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
6. 6. Air pressure gauges change an air pressure C. transducer
signal into an electronic voltage signal using
which of the following components?
A. inductor
B. capacitor
C. transducer
D. regulator
7. 7. Technician A says that linings worn too A. Technician A only
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
8. 8. Spring brakes on an air-braked vehicle must B. 20%
be able to hold the vehicle facing uphill or
downhill on what percent grade?
A. 10%
, T4 Brake Test SET I
Study online at https://quizlet.com/_c8ntfj
B. 20%
C. 30%
D. 40%
9. 9. The driver of a truck with hydraulic brakes C. Both A and B
says the pedal reserve is too low. Technician
A says the brakes could be out of adjustment.
Technician B says one brake system may have
failed. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B
10. 10. The parking brakes fail to apply on a truck D. Neither A or B
with air brakes. Technician A says this could
be caused by low air pressure in the spring
brake chamber. Technician B says this could be
caused by a ruptured spring brake diaphragm.
Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B
11. 11. Technician A says the low-pressure warning D. Neither A or B
indicator is located on the secondary reservoir
tank. Technician B says the low-pressure warn-
ing indicator operates once system air pres-
sure falls below 80 psi. Who is right?
A. Technician A
B. Technician B
, T4 Brake Test SET I
Study online at https://quizlet.com/_c8ntfj
C. Both A and B
D. Neither A or B
12. 12. The warning light on a truck with an A. misadjusted wheel sensor
anti-lock brake system lights when the truck
is started. When the truck is moving, the light
stays on. Which of the following could be the
cause?
A. misadjusted wheel sensor
B. bad air release solenoid
C. blown fail-safe monitor fuse
D. bad warning light relay
13. 13. The driver of a truck with air brakes says it A. The quick release valve exhaust
has poor stopping power. Any of these could port is plugged.
be the cause EXCEPT:
A. The quick-release valve exhaust port is
plugged.
B. The air pressure is too low.
C. The service line is restricted.
D. The brakes are adjusted incorrectly.
14. 14. Technician A says brake shoe oil contami- C. Both A and B
nation
should be no more than 10% of the lining sur-
face.
Technician B says oil contamination can lead to
brake
imbalance. Who is right?
A. Technician A only
B. Technician B only
