WorksheetsAnti-Lock Brake Systems Quiz
Total questions: 1
Worksheet time: 7mins
Which ABS device reads signals from the wheel sensors?
The wheel speed sensor ring
The master cylinder
The ABS ECU
The hydraulic control unit
How many wheel speed sensors does a typical four-channel hydraulic system have?
2
1
4
3
The ABS ECU is operating the hydraulic valves of the left front wheel during an ABS hydraulic cycle. What is the status of the left front inlet and outlet valves during the pressure isolate phase of the ABS cycle?
Inlet closed, outlet closed
Inlet closed, outlet open
Inlet open, outlet closed
Inlet open, outlet open
During the pressure isolate phase of the ABS cycle, both the inlet and outlet valves will be:
Open
Closed
Partially open
Partially closed
What is the function of the ABS system?
To lock the wheels during braking
To prevent the brakes from locking the wheels
To increase the risk of skidding
To reduce the effectiveness of the brakes
What is the purpose of the ABS warning lamp?
To warn the driver if the ABS system is not functioning correctly
To signal when the vehicle is in motion
To indicate when the brakes are applied
To indicate low brake fluid level
What is the function of the hydraulic control unit in an ABS system?
To calculate the control signals
To detect faults in the ABS system
To control the hydraulic pressure at each brake unit
To process information from electronic sensors
What is the purpose of the tone wheel in an ABS system?
To measure the speed of rotation of each wheel
To process information from electronic sensors
To cut the magnetic field of the speed sensor
To produce an AC voltage at the sensor output
What is the fail-safe mode of the ABS system?
To shut down the entire brake system
To maintain brake function if the power to the ABS system fails
To increase the risk of wheel lock
To disable the hydraulic control unit
What are the four function areas of the ABS ECU?
Master cylinder, brake light sensor, other signals, CAN bus and diagnostics
Input amplifier, computer unit, power stage, monitoring circuit
Wheel speed sensors, solenoid valves, safety relay, warning lamp
Hydraulic pump, brake booster, brake unit, ABS warning light
