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Home >> Volvo >> 1990 >> 740 Base, 4D Sedan, Standard >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Description

Anti-Lock Brake System: Description

Anti-Lock Brake System (ABS) consists of 3 speed sensors, an Electronic Control Unit (ECU) and a hydraulic modulator. The hydraulic modulator consists of front and rear pressure control solenoids and relays, a return motor pump and relay, and ECU connector. Modulator pressure control solenoids are mounted inside hydraulic modulator and are not individually serviceable. Replace modulator assembly if solenoids are defective.

ANTI-LOCK or ABS warning light is located on instrument panel light bar, and remains illuminated when an ABS failure occurs. If an ABS malfunction occurs, conventional braking system takes over. The vehicle may be safely driven when ABS warning light is ON.

NOTE: For more information on brakes, see BRAKE SYSTEM article.