T4 ASE BRAKES (MEDIUM/HEAVY
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS
Technician A says that when pressure testing a radiator cap, a special adapter is needed. Technician B
says the best way to check thermostat operation is while it is in the engine. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - The correct answer is A. Test the radiator cap with the cooling system
tester's radiator cap adapter. The thermostat can most effectively be rested by removing it from the
vehicle, and submerging it in coolant heater about l 5°]: (8°C) above the normal thermostat opening
temperature.
2. A technician Is checking resistance In an engine's spark plug wires using an ohmmeter. A general rule
Is to replace a wire if resistance is over:
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 2. The correct answer is B. A general rule is to replace the wire if the
resistance is over 30,000 ohms. The resistance of suspect wires can be checked using an ohmmeter. To
check resistance, disconnect the spark plug end and coil end of one spark plug wire. Connect an
ohmmeter lead to each end of the spark plug wire's terminals.
3. Technician A says that in an ignition system, the voltage supplied to the coil during starting is battery
voltage. Technician B says the coil uses electromagnetic induction to create high voltage. Who is right?
,A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 3.The correct answer is C, both technicians. Battery voltage supplies the
primary side of the ignition coil with 12 volt cs. The coil uses electromagnetic induction to create high
voltage. When the voltage is reduced on the primary side of the coil, the collapsing magnetic field
induces a much higher voltage in the secondary side and sends it through the secondary system in the
spark plugs.
A Front Wheel Drive (FWD) vehicle with an automatic transaxle has excessive vibration. Technician A
says that the vibration could be caused by worn engine/transaxle mounts. Technician B says that the
vibration could be caused by a misaligned engine/ transaxle subframe. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 4.The correct answer is C, both technicians. Worn engine and transaxle
mounts can cause vibration, but driveline vibration can also be caused by an engine transaxle subframe
that is damaged or not properly positioned and secured to the vehicle.
5. A technician suspects that a faulty camshaft sensor causes a driveability complaint. The sensor is
equipped with a threewire connector. What type of sensor is this?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 5.The correct answer is A. Hall effect switches are equipped with a
threewire connector; magnetic reluctance types are equipped with a twowire connector.
6. All of the following can cause a problem in the Hydroboost system EXCEPT:
, A. loose power steering pump belt
B. leaking power steering hoses
C. low power steering pump pressure
D. leaking check valve - ANSWER - 6.The correct answer is D. A vacuum check valve is used on a vacuum
power booster. The Hydroboost system operates by using power steering pump fluid pressure rather
than vacuum, so all of the other choices would apply.
7. Technician A: says that if a wire is getting too hot, it's a sign of higherthannormal current flowing
through. Technician B says the wire would heat up if some of the individual strands are broken Inside
the wire insulation. 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 C, both technicians. A hot electrical wire means
more electrons are trying to flow through it than the wire is capable of carrying. Usually this is a sign of
trouble. Typically, that trouble would be either a deterioration of the wire, possibly due to a number of
individual strands being broken in a conductor consisting of many individual strands, or
higherthannormal current flow, due to a problem in the wiring or the load.
8. Technician A says electrical connectors can be disconnected with the ignition switch ON, as long as
the technician is using a ground strap. Technician B says when welding on a vehicle, the technician
needs to use a static wrist strap. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 8. The correct answer is D, neither technician. Electrical connections
should NEVER be disconnected with the ignition switch on. This creates highvoltage spikes, which can
permanently ruin delicate circuits. Static sensitive parts should be handled using a wrist static strap to
drain the static charge from your body. Disconnect any computers before welding on a vehicle.
9. Technician A says the thermostat maintains maximum engine operating temperature. Technician B
says if the engine continuously runs hot, install a cooler thermostat. Who is right?
DUTY BRAKES) EXAM QUESTIONS
AND ANSWERS WITH COMPLETE
SOLUTIONS
Technician A says that when pressure testing a radiator cap, a special adapter is needed. Technician B
says the best way to check thermostat operation is while it is in the engine. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - The correct answer is A. Test the radiator cap with the cooling system
tester's radiator cap adapter. The thermostat can most effectively be rested by removing it from the
vehicle, and submerging it in coolant heater about l 5°]: (8°C) above the normal thermostat opening
temperature.
2. A technician Is checking resistance In an engine's spark plug wires using an ohmmeter. A general rule
Is to replace a wire if resistance is over:
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 2. The correct answer is B. A general rule is to replace the wire if the
resistance is over 30,000 ohms. The resistance of suspect wires can be checked using an ohmmeter. To
check resistance, disconnect the spark plug end and coil end of one spark plug wire. Connect an
ohmmeter lead to each end of the spark plug wire's terminals.
3. Technician A says that in an ignition system, the voltage supplied to the coil during starting is battery
voltage. Technician B says the coil uses electromagnetic induction to create high voltage. Who is right?
,A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 3.The correct answer is C, both technicians. Battery voltage supplies the
primary side of the ignition coil with 12 volt cs. The coil uses electromagnetic induction to create high
voltage. When the voltage is reduced on the primary side of the coil, the collapsing magnetic field
induces a much higher voltage in the secondary side and sends it through the secondary system in the
spark plugs.
A Front Wheel Drive (FWD) vehicle with an automatic transaxle has excessive vibration. Technician A
says that the vibration could be caused by worn engine/transaxle mounts. Technician B says that the
vibration could be caused by a misaligned engine/ transaxle subframe. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 4.The correct answer is C, both technicians. Worn engine and transaxle
mounts can cause vibration, but driveline vibration can also be caused by an engine transaxle subframe
that is damaged or not properly positioned and secured to the vehicle.
5. A technician suspects that a faulty camshaft sensor causes a driveability complaint. The sensor is
equipped with a threewire connector. What type of sensor is this?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 5.The correct answer is A. Hall effect switches are equipped with a
threewire connector; magnetic reluctance types are equipped with a twowire connector.
6. All of the following can cause a problem in the Hydroboost system EXCEPT:
, A. loose power steering pump belt
B. leaking power steering hoses
C. low power steering pump pressure
D. leaking check valve - ANSWER - 6.The correct answer is D. A vacuum check valve is used on a vacuum
power booster. The Hydroboost system operates by using power steering pump fluid pressure rather
than vacuum, so all of the other choices would apply.
7. Technician A: says that if a wire is getting too hot, it's a sign of higherthannormal current flowing
through. Technician B says the wire would heat up if some of the individual strands are broken Inside
the wire insulation. 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 C, both technicians. A hot electrical wire means
more electrons are trying to flow through it than the wire is capable of carrying. Usually this is a sign of
trouble. Typically, that trouble would be either a deterioration of the wire, possibly due to a number of
individual strands being broken in a conductor consisting of many individual strands, or
higherthannormal current flow, due to a problem in the wiring or the load.
8. Technician A says electrical connectors can be disconnected with the ignition switch ON, as long as
the technician is using a ground strap. Technician B says when welding on a vehicle, the technician
needs to use a static wrist strap. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A or B - ANSWER - 8. The correct answer is D, neither technician. Electrical connections
should NEVER be disconnected with the ignition switch on. This creates highvoltage spikes, which can
permanently ruin delicate circuits. Static sensitive parts should be handled using a wrist static strap to
drain the static charge from your body. Disconnect any computers before welding on a vehicle.
9. Technician A says the thermostat maintains maximum engine operating temperature. Technician B
says if the engine continuously runs hot, install a cooler thermostat. Who is right?
