Anti-Lock Brake System: Description

Anti-Lock Brake System (ABS) is designed to prevent wheel lock-up during heavy braking. ABS electronically controls brake fluid pressure, reducing chance of wheel lock-up. This allows driver to maintain better steering control of vehicle. Major components of ABS system are 4 wheel speed sensors, 4 tone wheels, ABSCM/HU, "G" sensor and ABS warning light. See Fig 1.

Fig 1: Locating ABS Components

Courtesy of SUBARU OF AMERICA, INC.