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There are some simple checks that can be performed without tools to see what might be causing error messages, warning lights, and/or reduced braking ability on 1987 through 1992 Cadillac Allante’s with the Bosch III ABS system. These checks can be performed by anyone, and require absolutely no mechanical knowledge. Learning about your ABS system will help save you money when it comes time for repairs, and enable you to respond appropriately if problems develop in the future.
The following is a brief description of the ABS system components. The ABS system consists of the Electronic Brake Control Module (EBCM on 1987-1989 models), or Electronic Brake and Traction Contol Module (EBTCM on 1990-1992 models), a pump to generate hydraulic assist, the ABS master cylinder unit, and wheel sensors at each wheel to provide feedback. In the case of 1990 through 1992 Allante’s the Traction Control feature is integrated with the ABS system. There two are other components that come into play, the relay which runs the ABS pump, and one of the stop light switches. The ABS master cylinder has several major components: the sensor block, the accumulator, the pressure control switch, the fluid reservoir, the valve body, and the hydraulic unit. Some of these components will be discussed later on.
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