Brake Junction Block

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A junction block is used on vehicles that are not equipped with anti-lock brakes (ABS). The junction block is located in front of the driver's side front tire behind the front fascia. See Fig 1. The junction block mounts in the same location as the ABS Integrated Control Unit (ICU) does on vehicles with ABS.

Fig 1: Identifying Junction Block Mounting

Courtesy of CHRYSLER CORP.

It has 6 threaded ports to which the brake tubes connect. Two are for the brake tubes coming from the master cylinder. The remaining 4 ports are for the brake tubes going to each brake assembly. The valve is permanently mounted to a bracket which fastens to the engine cradle crossmember.

Later production junction blocks have the proportioning valves for the rear brakes mounted in them. One valve is mounted in each end. See Fig 2. The proportioning valves are not serviced separately from the junction block. Vehicles with this type junction block no longer have proportioning valves mounted at the rear brake flex hoses.

Fig 2: Identifying Junction Block With Proportioning

Courtesy of CHRYSLER CORP.