ABS Modulation: Notes

Fig 1: ABS Modulation Graph

Courtesy of SAAB-SCANIA OF AMERICA, INC.

The ESP control module continually monitors wheel speed. If the value for a wheel exceeds the slip limit, the control module activates the ABS function and modulates the brake pressure to the wheel(s) in 3 phases. The modulation of the front brakes is individual, while the rear brake pressure is distributed evenly and determined by the wheel with least grip (greatest slip).