Anti-Lock Brake Systems Quiz

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