Anti-Lock Brakes ABS
ABS Warning Light The ABS assembly is made up partially of a central electronic unit, control solenoids and an electrical connector, during an ABS operation event, one or more of the solenoids help dump brake line pressure to a particular wheel allowing rotation.
ABS Motor and Valve The system uses a reluctor-wheel to track rotation which is picked up by a sensor.
ABS Wheel Reluctor A wheel speed sensor is used to pick up a magnetic pulse wave pattern generated by the reluctor ring and is feedback to the ABS computer. The location of wheel speed sensor may vary, on some vehicles the front sensor is made into the steering knuckle or spindle, near the front wheel hub or outer CV joint.
ABS Wheel Speed Sensor Helpful Information Research has shown that an anti-lock brake system can decrease the chance of a vehicle accident by 18% and was introduced in the late seventies. By using gyroscopic and steering wheel angle sensors, not only does ABS provide non-skid functionality but it also supports electronic stability control, brake assist and traction control. There are several types of ABS systems; some of the more popular systems are based on the Bosch ABS Actuator (BAA), Nippon-Denso ABS Actuator (NAA) systems. The basic idea is the same, Nippon-Denso systems has a separate solenoid pack and ABS computer, where as the Bosch systems both the components are combined. High quality brake fluid must be used in ABS brake systems due to harsh usage. When the ABS system detects a problem a fault code is stored in the ABS system control unit and the warning light illuminated. Most ABS brake systems are "real time", when a code has triggered, and the repair made, the code should clear itself within a few yards of driving.