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Discussion Starter · #1 ·
Looking for tips & PICS on how to and where best to run lines from proportioning value to front discs & rear drums. I have a TCI front clip and Ford 9” in the rear. Never attempted before so it’s a new experience for me.
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Easy.

Use as much of the OEM routing as possible. The stock brackets that hold the frame-end of the flexible hoses (2 front, 1 rear) should be retained, or something similar installed in a near-stock location.

Front tubing can be 3/16. From the proportioning valve (or the combination valve) to the rear hose should be 1/4" tubing, and then 3/16 from the axle-end of the hose to the two wheel cylinders.

In other words, each wheel cylinder (or caliper) should have 3/16 brake tubing supplying it, but where the plumbing for the two rear brakes is shared, use larger 1/4" tubing.

The FRONT brakes are not fed by the proportioning valve. The proportioning valve is for the rear brakes ONLY. The front discs may be fed from a metering/holdoff valve, which supplies the front brakes ONLY. There should be a "safety switch" between the front brake hydraulic system and the rear brake hydraulic system. The switch is pressure-balanced; loss of pressure in one hydraulic system activates the switch, which turns on a warning light on the instrument panel.

Depending on application, the metering valve, safety switch, and proportioning valve can be individual items, or built into a single housing--the "Combination Valve".
 
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