rear pressure low in system HELP

Boy, Brad, ya got me baffled

You don't have a factory warning lamp / proportioning assy downstream on the frame rail, do you?

Nope. Just the adjustable. Yesterday I installed a 2 lbs. residual valve between the mater cylinder and adjustable valve in the rear brake line. No change. Today I'm going to by-pass the adjustable valve and see what happens.

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