Section 4 (Anti-Lock Brake System With Traction Control System - BOSCH 5.3): Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 Pontiac Grand Prix, 1999 Pontiac Firebird, 1999 Oldsmobile Intrigue, 1999 Chevrolet Camaro, and 1998 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION before servicing anti-lock brake system.

The Bosch 5.3 Anti-Lock Brake System (ABS) with Traction Control System (TCS) is designed to prevent wheel lock-up during heavy braking. This provides improved driver control and reduces the distance required to stop vehicle. The system also monitors rear wheel speed and compares it to front wheel speed. TCS is operational at all vehicle speeds. If excessive front wheel speed is detected at either front wheel, TCS will be activated. TCS uses front brake intervention, fuel cut-off and spark retard to provide improved traction.

Major system components include the Electronic Brake Traction Control Module (EBTCM), speed sensors mounted at each wheel, 3 instrument cluster warning indicators, brakelight switch mounted at brake pedal, pump motor relay and solenoid valve relay mounted internal of EBTCM, and Brake Pressure Modulator Valve (BPMV). See Fig 1 . BPMV assembly houses electric pump motor and solenoid valves.

NOTE: For more information on brake system, see appropriate DISC & DRUM article.

Fig 1: Identifying ABS/TCS Components

Courtesy of GENERAL MOTORS CORP.