Section 4 (Anti-Lock Brake System - TCS-ETS - DELPHI DBC 7): Description

WARNING: This page is about a different car, the 1999 Buick Regal and 1999 Buick Century. 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 Delphi DBC 7 Anti-Lock Brake System/Traction Control-Enhanced Traction System (ABS/TCS-ETS) increases vehicle steerability, directional stability and optimum deceleration in severe braking conditions on most road surfaces. The ABS monitors wheel speed and controls brakeline pressure to eliminate uncontrolled skidding.

The system also monitors rear wheel speed and compares it to front wheel speed. If excessive front wheel speed is detected at either front wheel, TCS-ETS will be activated. TCS-ETS uses engine fuel/timing management to provide improved traction and vehicle stability. The Enhanced Traction System (ETS) uses upshifting of the transmission while the Traction Control System (TCS) uses front brake intervention to assist the wheel slip condition.

Major system components include Electronic Brake Control Module (EBCM) or Electronic Brake and Traction Control Module (EBTCM), speed sensors mounted at each wheel, instrument cluster warning indicators, brakelight switch mounted at brake pedal, TRAC on/off switch located in the center console or I/P, solenoid valve relay and pump motor relay located in EBCM/EBTCM, and Brake Pressure Modulator Valve (BPMV) assembly. BPMV assembly houses electric pump motor and solenoid valves. EBCM/EBTCM and BPMV assembly is located on the left of the engine compartment.

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