GM Corvette 1984-1996 Repair Guide

General Information


The purpose of the Anti-lock Braking System (ABS), used on 1986-96 vehicles, is to maintain vehicle steerability, directional stability and the best deceleration possible under severe braking conditions on most road surfaces. The ABS monitors the speed of each vehicle wheel (treating the rear wheels as a pair) during a braking maneuver. The control module processes these values to produce command controls to prevent the braked wheels from locking. This provides the driver with the best and most vehicle control. There are 3 different types of anti-lock brake systems used on these vehicles however, the all operate in basically the same manner.


Before using this information, it is important that you have a basic knowledge of the following items. Without this basic knowledge, it will be difficult to use the diagnostic procedures contained in this information.

Basic Electrical Circuits

- You should understand the basic theory of electricity and know the meaning of voltage, current (amps) and resistance (ohms). You should understand what happens in a circuit with an open or shorted wire. You should be able to read and understand a wiring diagram.

Use of Circuit Testing Tools

- You should know how to use a test light and how to use jumper wires to bypass components to test circuits. You should be familiar with the J 39200 digital multimeter. You should be able to measure voltage, resistance and current and be familiar with the meter controls and how to use them correctly.


Failure to observe the following precautions may result in system damage.

Before performing electric arc welding on the vehicle, disconnect the Electronic Brake Control Module (EBCM) and the hydraulic modulator connectors.
When performing painting work on the vehicle, do not expose the Electronic Brake Control Module (EBCM) to temperatures in excess of 185°F (85°C) for longer than 2 hrs. The system may be exposed to temperatures up to 200°F (95°C) for less than 15 min.
Never disconnect or connect the Electronic Brake Control Module (EBCM) or hydraulic modulator connectors with the ignition switch ON .
Never disassemble any component of the Anti-Lock Brake System (ABS) which is designated non-serviceable; the component must be replaced as an assembly.
When filling the master cylinder, always use Delco Supreme 11 brake fluid or equivalent, which meets DOT-3 specifications; petroleum base fluid will destroy the rubber parts.