Operation CHARM: Car repair manuals for everyone.

Antilock Braking Mode Description

Antilock Braking Mode Description
Apply





If a wheel speed sensor detects a wheel locking up, the Electronic Brake Control Module (EBCM) closes the normally open inlet valve for the brake on that wheel to prevent adding more hydraulic pressure to that brake.

Hold





The illustration shows this for the right front brake.

Release





If the wheel locking tendency continues, the EBCM releases the hydraulic pressure at that brake by opening the outlet valve for that wheel.