T4 ASE style questions and
answers
All of the following names describe air brake reservoirs EXCEPT:
Auxiliary
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
All of the following are phases of hydraulic brake ABS control EXCEPT:
Pressure induction
3 multiple choice options
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?
Exhaust Port
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
When should the air tanks be drained on an air braked vehicle with no air
dryer.
Once a day
3 multiple choice options
The Driver Vehicle Inspect Report (DVIR) should be submitted:
Daily
3 multiple choice options
The minimum suggested lining thickness for drum brakes is:
1/4-in
, 3 multiple choice options
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?
Technician B
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
Which of the following best describes the operation of an air-operated ABS
system?
Works in tandem with ATC
3 multiple choice options
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
3 multiple choice options
answers
All of the following names describe air brake reservoirs EXCEPT:
Auxiliary
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
All of the following are phases of hydraulic brake ABS control EXCEPT:
Pressure induction
3 multiple choice options
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?
Exhaust Port
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
When should the air tanks be drained on an air braked vehicle with no air
dryer.
Once a day
3 multiple choice options
The Driver Vehicle Inspect Report (DVIR) should be submitted:
Daily
3 multiple choice options
The minimum suggested lining thickness for drum brakes is:
1/4-in
, 3 multiple choice options
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?
Technician B
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
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
3 multiple choice options
Which of the following best describes the operation of an air-operated ABS
system?
Works in tandem with ATC
3 multiple choice options
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
3 multiple choice options
