brake electronics

What is a typical air gap between a wheel speed sensor and a sensor ring?

>1mm

What does ABS stand for?

Anti-lock Braking System

ESP stands for?

Electronic Stability Program

True or false: an ABS lamp which stays illuminated when the ignition is turned on indicates a mechanical fault

False. It indicates an electrical fault

True or false: ABS brakes increases the stopping distance

False. Modern ABS brakes actually reduce stopping distance

Who was the first manufacturer to use ABS on production vehicles?

Mercedes-Benz. They introduced it on the 1978 S class in December of that year, as an option.

True or false: When the ABS lamp is lit, the ABS system is disabled

True. This is a fail-safe mechanism so that braking faults do not affect the vehicle's safety.

What is the best way of testing an ABS wheel speed sensor?

With an oscilloscope to test the "signature" of AC voltage produced by the sensor. The next best method is with an AC voltmeter.

The purpose of ABS is to

allow the driver to maintain safe control of the vehicle

What type of sensor is the most commonly used for ABS wheel speed measurement?

vR sensor, or variable reluctance sensor