Anti-Lock Brake System - Without Traction Control: Description

CAUTION: See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION.

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

Anti-Lock Brake System (ABS) consists of wheel sensors on both front rotors and in rear axle, an ABS Electronic Control Unit (ECU) under right side of instrument panel, and a hydraulic modulator in engine compartment. See Fig 1 . Hydraulic modulator consists of valve relay, pump motor relay, connector, pump and motor, and 3 valves. See Fig 2 .

An ABS warning light in instrument panel will remain illuminated if an ABS failure occurs. If an ABS malfunction occurs, conventional braking system will still function.

Fig 1: Locating ABS Components

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Locating Hydraulic Modulator Components

Courtesy of VOLVO CARS OF NORTH AMERICA.