ABS Components and diag

The maximum traction between a tire and the road occurs when the tire is _______________.

• locked and skidding

• rotating freely

• slipping 15 to 25 percent

• slipping 80 to 90 percent

Antilock brakes cannot defy the laws of physics under what conditions?

• When a vehicle enters a corner traveling faster than it is physically possible to negotiate the turn

• If the brakes are applied too late to bring the vehicle to a complete stop before impact

• Be able to stop the vehicle in a short distance under all conditions

• All of the above

Technician A says that the ABS may not result in shorter stopping distance compared to brakes without ABS. Technician B says that a pulsating brake pedal during normal braking is a characteristic feature of most ABS equipped vehicles. Which technician is correct?

• Tech A

• Tech B

• Both Tech A and Tech B

• Neither Tech A nor Tech B

Which type of antilock brake system (ABS) requires the use of four wheel speed sensors?

• One channel

• Two channel

• Three channel

• Four channel

A passive wheel speed sensor is also referred to as _____________

• variable reluctance (VR)

• magnetic

• magneto resistive (MR)

• either a or b     

Which part of an antilock brake system is used for tire pressure monitoring?

• Hydraulic control module

• Wheel speed sensors    

• Yaw sensor

• Brake pedal position (BPP) sensor

What safety precautions should be adhered to when working on or around a vehicle equipped with ABS?

• Avoid mounting any antenna near the ABS control unit

• Never open a bleeder valve or an hydraulic line while the ABS is energized

• Do not pry against or on a wheel speed sensor

• All of the above

The ABS controller uses what signal characteristic from a wheel speed sensor?

• Voltage

• Frequency

• Resistance

• Electromagnetic

The faster a wheel rotates, the higher the frequency produced by a wheel speed sensor.

• True

• False

Technician A says that some wheel speed sensors are enclosed in a wheel bearing assembly. Technician B says that some wheel speed sensors are exposed to possible damage from road debris. Which technician is correct?

• Tech A

• Tech B

• Both Tech A and Tech B

• Neither Tech A nor Tech B