Anti-Lock - Without Traction Control: Description
The Anti-Lock Brake System (ABS) prevents wheel lock-up during abrupt braking or when braking on slippery surfaces. The system detects wheel rotation rate and electronically controls fluid pressure applied to brakes.
A slight vibration and noise may be noticed during hard braking. These conditions are normal and indicate anti-lock brake system is functioning properly. Components include ABS control unit, actuator assembly, 2 front wheel sensors and 2 rear wheel sensors. See Fig 1 . On models with Manual Transmissions (M/T) sensor unit consists of a gear shaped sensor rotor and a sensor element. The element contains a bar magnet around which a coil is wound. The sensor is installed on the back side of the brake rotor. Sine-wave current is generated by the sensor as the wheel rotates. The frequency and voltage increase(s) as the rotating speed increases. See Fig 2 . For models with Automatic Transmissions (A/T) the front sensor unit consist of a gear shaped sensor rotor and a sensor element. The element contains a magnet and integrated circuit. The front wheel sensors are installed on the front of the wheel knuckles. As the wheel rotates, the sensor generates a square-wave signal. The frequency increases as the wheel speed increases. See Fig 3 .