Anti-Lock Brake System: Outline

The ABS is an electronically controlled brake system which controls brake application to maintain directional stability and steering of the vehicle during braking.
The ABS does this by determining the amount of wheel slippage during sudden braking or during braking on snow-covered or otherwise slippery road surfaces. Signals are then relayed and acted upon through a computerized ABS control module.
The ABS is an independent front wheel control, rear axle control (select low control), four sensor, 3-channel system.
It's basic components are the hydraulic unit, the control module and the four wheel-speed sensors.

NOTE:

Select low control is a method that controls the hydraulic pressure of both the right and left rear wheels by comparing wheel speeds and then controlling the hydraulic pressure in relation to the side which is in greater danger of the brake locking.