2
T4 ASE Exam questions with verified solutions
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All of the following names describe air brake reservoirs EXCEPT:
|| || || || || || || || ||
Auxiliary
|| || ||
Technician A says that before a gear-driven air compressor is replaced, the gear must be
|| || || || || || || || || || || || || || ||
timed with the engine prior to installation. Technician B says that when timing an air
|| || || || || || || || || || || || || || ||
compressor gear, the piston in the engine's No. 1 cylinder must be at Top Dead Center. Who
|| || || || || || || || || || || || || || || || ||
is right? ||
Both A and B || || ||
|| || ||
Technician A says most manufacturers recommend checking automatic slack adjuster
|| || || || || || || || || ||
internal clutch operation with a torque wrench. Technician B says if the free stroke is within
|| || || || || || || || || || || || || || ||
manufacturer's specifications, but the applied stroke is not, the problem could be with the
|| || || || || || || || || || || || || || ||
automatic slack adjuster. Who is right? || || || || ||
Technician A ||
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A truck with air brakes takes an inordinate time to build up adequate air pressure. Oil has
|| || || || || || || || || || || || || || || || ||
been found in the air brake system. Technician A says the compressor air filter could be
|| || || || || || || || || || || || || || || ||
clogged. Technician B says the compressor oil control rings could be worn. Who is right?
|| || || || || || || || || || || || || ||
Both A and B || || ||
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All of the following are phases of hydraulic brake ABS control EXCEPT:
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Pressure induction ||
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Technician A says automatic slack adjusters improve brake balance and reduce downtime
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and maintenance costs. Technician B says manual slack adjusters provide reduced chamber
|| || || || || || || || || || || ||
travel and less air consumption. Who is right?
|| || || || || || ||
Technician A ||
When checking an application valve for internal leaks, an ultrasonic leak detector can be
|| || || || || || || || || || || || || ||
used at which port? || || ||
,2
Exhaust Port ||
|| || ||
The right front wheel of a truck with hydraulic anti-lock brakes locks up when on a slippery
|| || || || || || || || || || || || || || || ||
surface. Technician A says the truck could have a defective wheel sensor. Technician B says
|| || || || || || || || || || || || || || || ||
the sensor checks for a lock-up condition and sends a signal to the hydraulic modulator.
|| || || || || || || || || || || || || || ||
Who is right? || ||
Both A and B || || ||
|| || ||
Technician A says brake shoe oil contamination should be no more than 10% of the lining
|| || || || || || || || || || || || || || || ||
surface. Technician B says oil contamination can lead to brake imbalance. Who is right?
|| || || || || || || || || || || || ||
Both A and B || || ||
|| || ||
Technician A says that Automatic Traction Control (ATC) controls the engine only.
|| || || || || || || || || || || ||
Technician B says that automatic traction control works in tandem with antilock brakes.
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Who is right? || ||
Technician B ||
|| || ||
An air-braked vehicle has lining wear tapered from inboard to outboard. There also is
|| || || || || || || || || || || || || ||
abrasion on the outer edges of the brake shoes. What could NOT be the cause?
|| || || || || || || || || || || || || ||
Weak return springs || ||
|| || ||
When should the air tanks be drained on an air braked vehicle with no air dryer.
|| || || || || || || || || || || || || || ||
Once a day || ||
|| || ||
The Driver Vehicle Inspect Report (DVIR) should be submitted:
|| || || || || || || ||
Daily
|| || ||
The minimum suggested lining thickness for drum brakes is:
|| || || || || || || ||
1/4-in
|| || ||
Technician A says coefficient of friction is the amount of heat absorbed into the drum.
|| || || || || || || || || || || || || || ||
Technician B says brake shoes with high coefficient of friction will slow a truck with less
|| || || || || || || || || || || || || || || ||
application pressure. Who is right? || || || ||
, 2
Technician B ||
|| || ||
The driver of a truck with air brakes says it has poor stopping power. Any of these could be
|| || || || || || || || || || || || || || || || || || ||
the cause EXCEPT:
|| ||
The quick release valve exhaust port is plugged
|| || || || || || ||
|| || ||
Technician A says disc brake rotor thickness must be measured in several places on the
|| || || || || || || || || || || || || || ||
rotor using a dial indicator. Technician B says the thickness of disc brake rotors must not
|| || || || || || || || || || || || || || || ||
vary more than 0.005 in. Who is right?
|| || || || || || ||
Technician B ||
|| || ||
Technician A says the brake ABS is used to control the truck during deceleration.
|| || || || || || || || || || || || || ||
Technician B says ATC is used to keep loads from shifting. Who is right?
|| || || || || || || || || || || || ||
Technician A ||
|| || ||
The driver of a truck with hydraulic drum brakes complains that when his vehicle is
|| || || || || || || || || || || || || || ||
unloaded, the rear brakes lock up on moderate to hard braking application. Which of the
|| || || || || || || || || || || || || || ||
following could be the cause? || || || ||
Defective proportioning valve || ||
|| || ||
Which of the following best describes the operation of an air-operated ABS system?
|| || || || || || || || || || || ||
Works in tandem with ATC || || || ||
|| || ||
The driver of an air-braked truck with ABS complains that on a panic stop in wet weather
|| || || || || || || || || || || || || || || || ||
conditions, the truck's right rear wheel locks up. What could be the cause?
|| || || || || || || || || || || ||
A defective ABS wheel sensor
|| || || ||
|| || ||
Air pressure gauges change an air pressure signal into an electronic voltage signal using
|| || || || || || || || || || || || || ||
which of the following components? || || || ||
Transducer
|| || ||
T4 ASE Exam questions with verified solutions
|| || || || || ||
All of the following names describe air brake reservoirs EXCEPT:
|| || || || || || || || ||
Auxiliary
|| || ||
Technician A says that before a gear-driven air compressor is replaced, the gear must be
|| || || || || || || || || || || || || || ||
timed with the engine prior to installation. Technician B says that when timing an air
|| || || || || || || || || || || || || || ||
compressor gear, the piston in the engine's No. 1 cylinder must be at Top Dead Center. Who
|| || || || || || || || || || || || || || || || ||
is right? ||
Both A and B || || ||
|| || ||
Technician A says most manufacturers recommend checking automatic slack adjuster
|| || || || || || || || || ||
internal clutch operation with a torque wrench. Technician B says if the free stroke is within
|| || || || || || || || || || || || || || ||
manufacturer's specifications, but the applied stroke is not, the problem could be with the
|| || || || || || || || || || || || || || ||
automatic slack adjuster. Who is right? || || || || ||
Technician A ||
|| || ||
A truck with air brakes takes an inordinate time to build up adequate air pressure. Oil has
|| || || || || || || || || || || || || || || || ||
been found in the air brake system. Technician A says the compressor air filter could be
|| || || || || || || || || || || || || || || ||
clogged. Technician B says the compressor oil control rings could be worn. Who is right?
|| || || || || || || || || || || || || ||
Both A and B || || ||
|| || ||
All of the following are phases of hydraulic brake ABS control EXCEPT:
|| || || || || || || || || || ||
Pressure induction ||
|| || ||
Technician A says automatic slack adjusters improve brake balance and reduce downtime
|| || || || || || || || || || || ||
and maintenance costs. Technician B says manual slack adjusters provide reduced chamber
|| || || || || || || || || || || ||
travel and less air consumption. Who is right?
|| || || || || || ||
Technician A ||
When checking an application valve for internal leaks, an ultrasonic leak detector can be
|| || || || || || || || || || || || || ||
used at which port? || || ||
,2
Exhaust Port ||
|| || ||
The right front wheel of a truck with hydraulic anti-lock brakes locks up when on a slippery
|| || || || || || || || || || || || || || || ||
surface. Technician A says the truck could have a defective wheel sensor. Technician B says
|| || || || || || || || || || || || || || || ||
the sensor checks for a lock-up condition and sends a signal to the hydraulic modulator.
|| || || || || || || || || || || || || || ||
Who is right? || ||
Both A and B || || ||
|| || ||
Technician A says brake shoe oil contamination should be no more than 10% of the lining
|| || || || || || || || || || || || || || || ||
surface. Technician B says oil contamination can lead to brake imbalance. Who is right?
|| || || || || || || || || || || || ||
Both A and B || || ||
|| || ||
Technician A says that Automatic Traction Control (ATC) controls the engine only.
|| || || || || || || || || || || ||
Technician B says that automatic traction control works in tandem with antilock brakes.
|| || || || || || || || || || || || ||
Who is right? || ||
Technician B ||
|| || ||
An air-braked vehicle has lining wear tapered from inboard to outboard. There also is
|| || || || || || || || || || || || || ||
abrasion on the outer edges of the brake shoes. What could NOT be the cause?
|| || || || || || || || || || || || || ||
Weak return springs || ||
|| || ||
When should the air tanks be drained on an air braked vehicle with no air dryer.
|| || || || || || || || || || || || || || ||
Once a day || ||
|| || ||
The Driver Vehicle Inspect Report (DVIR) should be submitted:
|| || || || || || || ||
Daily
|| || ||
The minimum suggested lining thickness for drum brakes is:
|| || || || || || || ||
1/4-in
|| || ||
Technician A says coefficient of friction is the amount of heat absorbed into the drum.
|| || || || || || || || || || || || || || ||
Technician B says brake shoes with high coefficient of friction will slow a truck with less
|| || || || || || || || || || || || || || || ||
application pressure. Who is right? || || || ||
, 2
Technician B ||
|| || ||
The driver of a truck with air brakes says it has poor stopping power. Any of these could be
|| || || || || || || || || || || || || || || || || || ||
the cause EXCEPT:
|| ||
The quick release valve exhaust port is plugged
|| || || || || || ||
|| || ||
Technician A says disc brake rotor thickness must be measured in several places on the
|| || || || || || || || || || || || || || ||
rotor using a dial indicator. Technician B says the thickness of disc brake rotors must not
|| || || || || || || || || || || || || || || ||
vary more than 0.005 in. Who is right?
|| || || || || || ||
Technician B ||
|| || ||
Technician A says the brake ABS is used to control the truck during deceleration.
|| || || || || || || || || || || || || ||
Technician B says ATC is used to keep loads from shifting. Who is right?
|| || || || || || || || || || || || ||
Technician A ||
|| || ||
The driver of a truck with hydraulic drum brakes complains that when his vehicle is
|| || || || || || || || || || || || || || ||
unloaded, the rear brakes lock up on moderate to hard braking application. Which of the
|| || || || || || || || || || || || || || ||
following could be the cause? || || || ||
Defective proportioning valve || ||
|| || ||
Which of the following best describes the operation of an air-operated ABS system?
|| || || || || || || || || || || ||
Works in tandem with ATC || || || ||
|| || ||
The driver of an air-braked truck with ABS complains that on a panic stop in wet weather
|| || || || || || || || || || || || || || || || ||
conditions, the truck's right rear wheel locks up. What could be the cause?
|| || || || || || || || || || || ||
A defective ABS wheel sensor
|| || || ||
|| || ||
Air pressure gauges change an air pressure signal into an electronic voltage signal using
|| || || || || || || || || || || || || ||
which of the following components? || || || ||
Transducer
|| || ||
