Brake System, Anti-Lock, Rear and 4-Wheel

F-Series vehicles (except F-Super Duty) use the rear anti-lock brake system (RABS). Bronco vehicles are equipped with 4-wheel ABS, which incorporates the same rear axle-mounted rear brake anti-lock sensor as the RABS system.

Rear axles (4001) in vehicles equipped with the anti-lock brakes system (ABS) contain a rear brake anti-lock sensor and anti-lock speed sensor ring mounted in the carrier.

The systems features an anti-lock speed sensor ring that is pressed on the differential case (4204) behind the ring gear and pinion. If the anti-lock speed sensor ring is removed, it must be discarded and replaced with a new one. The anti-lock speed sensor ring works in conjunction with a rear brake anti-lock sensor. This rear brake anti-lock sensor is retained in a bore at the top of the carrier housing and fastened by one bolt. There is a space provided between the ring gear and pinion and anti-lock speed sensor ring for measuring the ring gear and pinion backface runout. For anti-lock speed sensor ring removal and installation procedures, refer to the appropriate rear axle section in Group 05.

F-Super Duty Motorhome vehicles do not incorporate the rear brake anti-lock sensor and anti-lock speed sensor ring.

All other F-Super Duty vehicles incorporate the rear brake anti-lock sensor and anti-lock speed sensor ring as a signal generator, not for a RABS system. The signal is used for the speedometer system along with other vehicle systems that require a road speed signal.

For a detailed description of ABS, refer to Section 06-09A or Section 06-09B.