Junction Block
A junction block is used on vehicles that are not equipped with 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 ICU does on vehicles with ABS. It has 6 threaded ports to which the brake lines connect. Two are for the brake lines coming from the master cylinder. The remaining 4 ports are for the brake lines 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. The junction block distributes the brake fluid coming from the master cylinder primary and secondary ports to the 4 brake lines leading to the brakes. Since the junction block mounts in the same location as the ICU, it allows for the common use of the brake lines on the vehicle whether it is equipped with or without ABS. Later applications of the junction block include 2 proportioning valves. Placed in the fluid flow passage leading to the rear brake tube ports, they balance front-to-rear braking.