Section 19 (Anti-Lock Brake System With Traction Control System - BOSCH 5.3): Description

WARNING: This page is about a different car, the 2001 Pontiac Grand Prix, 2001 Pontiac Firebird, 2001 Oldsmobile Intrigue, and 2001 Chevrolet Camaro. 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 Control Module (EBCM), speed sensors mounted at each wheel, 3 instrument cluster warning indicators, stoplight switch mounted at brake pedal, pump motor relay and solenoid valve relay mounted internal of EBCM, and Brake Pressure Modulator Valve (BPMV). See Fig 1 . BPMV assembly houses electric pump motor and solenoid valves.

Options and terminology vary between models. Camaro is equipped with Anti-Lock Brakes (ABS) and Traction Control System (TCS) referred to as Acceleration Slip Regulation (ASR). Firebird is equipped ABS and TCS. Grand Prix is equipped with ABS and TCS referred to as Enhanced Traction System (ETS). Intrigue is equipped with ABS, TCS and optional Vehicle Stability Enhancement System (VSES) referred to as Precision Control System (PCS).

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

Fig 1: Identifying ABS/TCS Components

Courtesy of GENERAL MOTORS CORP.