ASE A5 Brakes Practice Test - Section 6-Electronic
Brake Control Systems: ABS, TCS and ESC || Mini
Mastery Test: Score High Fast!!
The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the
engine running. Technician A says to check for ABS or TCS (traction control system)
diagnostic trouble codes. Technician B says you can check for ABS or TCS blink codes by
connecting two pins of the DLC (Data Link Connector). Who is right? correct answers c -
Both technicians are correct.
5. A wheel speed sensor is being diagnosed using the OEM (original equipment
manufacturer) diagnostic scan tool. Technician A says to verify wheel speed sensor
operation, compare all four wheel speed sensor outputs to vehicle speed on the data list.
Technician B says the wheel's direction of rotation can be verified by looking at the wheel
direction on the scan tool data list. Who is right? correct answers - Both technicians are
correct.
The front brake rotors and pads are being replaced on a vehicle equipped with a TCS (traction
control system) and electronic stability control system (ESC). Technician A says the yaw rate
and deceleration sensor should be recalibrated. Technician B says the new rotors should be
indexed to the hub using a dial indicator for the least amount of runout. Who is right? correct
answers B only- This is the standard process by many OEMS when a new rotor is installed.
Technician A is wrong because recalibration is not required for these sensors.
The ABS (antilock brake system) amber light does not go off after the engine is started.
Technician A says a parking brake not fully released could be the cause. Technician B says
when this happens the brakes will operate like a normal non-ABS brake system. Who is
right? correct answers b - If the amber light is on it indicates an ABS fault and the system
will revert to regular brake operation without ABS. Technician A is wrong because the
parking brake only affects the RED Brake Light not the amber.
. Technician A says a pulsation felt in the brake pedal during an ABS (antilock brake system)
stop indicates there is a problem within the ABS system. Technician B says the ABS amber
light comes on during whenever there is wheel slippage. Who is right? correct answers
Neither A nor B
- Technician A is wrong because the pulsation is normal and not a problem. Technician B is
wrong because the amber light does not come on unless there is a fault in the ABS system.
A 3-channel ABS (Anti-Lock Brake System) equipped vehicle has a wheel lockup on braking
with no amber warning light or DTC (Diagnostic Trouble Codes) set. Technician A says
contaminated linings on both rear axles could be the cause. Technician B says a defective
front wheel speed sensor could be the cause. Who is right? correct answers . A only
- Contaminated linings on both axles could still have the same wheel speed in a 3-channel
system and not normally be detected by the ABS. Technician B is wrong because a front
wheel sensor would set a code and put on the amber light.
Brake Control Systems: ABS, TCS and ESC || Mini
Mastery Test: Score High Fast!!
The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the
engine running. Technician A says to check for ABS or TCS (traction control system)
diagnostic trouble codes. Technician B says you can check for ABS or TCS blink codes by
connecting two pins of the DLC (Data Link Connector). Who is right? correct answers c -
Both technicians are correct.
5. A wheel speed sensor is being diagnosed using the OEM (original equipment
manufacturer) diagnostic scan tool. Technician A says to verify wheel speed sensor
operation, compare all four wheel speed sensor outputs to vehicle speed on the data list.
Technician B says the wheel's direction of rotation can be verified by looking at the wheel
direction on the scan tool data list. Who is right? correct answers - Both technicians are
correct.
The front brake rotors and pads are being replaced on a vehicle equipped with a TCS (traction
control system) and electronic stability control system (ESC). Technician A says the yaw rate
and deceleration sensor should be recalibrated. Technician B says the new rotors should be
indexed to the hub using a dial indicator for the least amount of runout. Who is right? correct
answers B only- This is the standard process by many OEMS when a new rotor is installed.
Technician A is wrong because recalibration is not required for these sensors.
The ABS (antilock brake system) amber light does not go off after the engine is started.
Technician A says a parking brake not fully released could be the cause. Technician B says
when this happens the brakes will operate like a normal non-ABS brake system. Who is
right? correct answers b - If the amber light is on it indicates an ABS fault and the system
will revert to regular brake operation without ABS. Technician A is wrong because the
parking brake only affects the RED Brake Light not the amber.
. Technician A says a pulsation felt in the brake pedal during an ABS (antilock brake system)
stop indicates there is a problem within the ABS system. Technician B says the ABS amber
light comes on during whenever there is wheel slippage. Who is right? correct answers
Neither A nor B
- Technician A is wrong because the pulsation is normal and not a problem. Technician B is
wrong because the amber light does not come on unless there is a fault in the ABS system.
A 3-channel ABS (Anti-Lock Brake System) equipped vehicle has a wheel lockup on braking
with no amber warning light or DTC (Diagnostic Trouble Codes) set. Technician A says
contaminated linings on both rear axles could be the cause. Technician B says a defective
front wheel speed sensor could be the cause. Who is right? correct answers . A only
- Contaminated linings on both axles could still have the same wheel speed in a 3-channel
system and not normally be detected by the ABS. Technician B is wrong because a front
wheel sensor would set a code and put on the amber light.
