Anti-Lock Brake System - 4WAL: Description

The Kelsey-Hayes EBC310 (Black cover) and EBC325 (Gray cover) 4-Wheel Anti-Lock (4WAL) brake systems are used. The EB310 is used on all 2000 model year vehicles except the "S" and "T" Series pickups and 2-door utility vehicles, which use the EB325. All 2001 model year vehicles use the Kelsey-Hayes EB325 ABS system. The EB325 is smaller in size and weight, has fewer electrical connections (3), tube adapter is not used and combination valve is not mounted to BPMV.

The ABS prevents wheel lock-up during heavy braking. This allows driver to maintain steering control while stopping vehicle in shortest distance possible. The system consists of Brake Pressure Modulator Valve (BPMV), Powertrain Control Module (PCM), Vehicle Speed Sensor (VSS) or Vehicle Control Module (VCM), Wheel Speed Sensors (WSS), warning lights, electrical wiring and hydraulic lines.

The Electro-Hydraulic Control Unit (EHCU) is the entire unit, including the BPMV, Electronic Brake Control Module (EBCM) and combination valve. The EBCM is the electronic control portion of ABS assembly and is mounted on top of BPMV. EHCU is located in left rear of engine compartment, near brake master cylinder.