F - Air Anti-lock Brake System Fundamentals Flashcards
List two advantages when braking a vehicle equipped with anti-lock brakes.
Directional stability and control.
Braking is most effective when the rotation of the wheel and tire is slowed:
Decreased stopping distances.
The anti-lock air brake system modulates … to slow the vehicle effectively and under control.
Brake application pressure.
Anti-lock brake systems can modulate brake application pressure up to … times per second.
100.
List the basic components of an anti-lock system.
Tone wheel, speed sensor, ECU, ABS indicator lamp, and brake modulator valve.
A modulator valve is in the air lines to each front wheel and to the right driving tandems and the left driving tandems. What type of ABS system is this?
4S 4M.
The purpose of the tone ring is to:
Induce electrical pulses in the speed sensor.
The anti-lock system’s ECU is a computer that:
Analyzes and processes speed sensor signals and controls the brake modulator valves.
A vehicle is being driven with the ABS indicator light illuminated. This indicates to the driver that:
There is anti-lock system malfunction.
If the anti-lock system fails during vehicle operation, the standard brake system will:
Function normally.
The tone rings are most commonly mounted to the:
Wheel hubs.
On a tandem drive axle truck chassis with one modulator valve for each side, the modulator valve controls:
Two brake chambers.
If arc welding must be performed on vehicle with anti-lock, the ECU should be:
Unplugged or disconnected.
When removing the hub assembly from an anti-lock equipped vehicle, a technician must:
Take care not to damage the tone ring and sensor, and support and block the vehicle safely.
A wheel speed sensor is positioned by:
Pushing the sensor in until it touches the tone wheel.
