Does anybody know how the abs brakes system of the jeep work

Does anybody know how the abs brakes system of the jeep work?

problem and year

The Bendix nine ABS system on 1989 to 1991 Jeep Cherokee and Wagoneer is an integral ABS system that combines the master brake cylinder with the hydraulic control modulator and two accumulators. The pump and motor are a separate assembly, but work with the master cylinder and hydraulic modulator assembly to offer power help also as anti lock braking.

Bendix nine is a four wheel, three hydraulic channel ABS system. throughout normal braking, the brake hydraulics are split diagonally. But throughout anti lock braking, both front brakes are controlled individually, while the rear brakes are controlled as a pair. The modulator assembly holds nine solenoid valves: an separation valve, a decay valve and a build valve for each of the three ABS circuits.

Four wheel speed sensors one for each wheel were used. Front sensors are on the steering knuckles, with the sensor tone rings mounted on the axle shafts. Rear sensors are on the rear brake backing plates, with the sensor rings mounted on the axles.

The Bendix nine system control module is under the back seat attached to the floorpan. On 1989 and 1990 models, the mounting angle of the module is important because the module holds a mercury switch that monitors car deceleration. This lets the module to change anti lock braking to better suit slippery driving conditions when the car is being operated in four wheel drive. If the module is removed or replaced, it must be reinstalled at exactly the same angle as before so the mercury switch will function properly. On 1991 models, the module is mounted on a bracket that holds it at the correct angle.

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