Need Proportioning Valve HELP!

[Toadman]

Just installed the SSBC adjustable proportioning valve with gauge in my '77 Camaro. I am running '81 Trans Am disc brakes with the '81 booster & master cylinder. I now have no pedal pressure, and no matter how far or which direction I turn the knob the gauge stays at zero. I am 100% positive that I have the in & out to the prop valve plumbed correctly. Don't know if it matters, but I have the gauge attached to the "out" port of the prop valve. The lines have been bled & I seem to have pressure at the master cylinder.

This snafu is preventing me from participating in the road course portion of the Motor State Challenge tomorrow!! I'm hoping that I can figure it out in time to make the autocross on Sunday!

HELLLLLLLLLLLLLLLP!

[Toadman]

OK, so I guess I'm going to swap the stock prop valve back in & see if that makes any difference. No one has any ideas???

[chicane67]

"I now have no pedal pressure"...and... "I seem to have pressure at the master cylinder"... don't exactly add up.

You either have pressure or you don't. I would first delete the guage and see if if makes a difference. If it does not... I would swap back to the stock unit to make the event and trouble shoot the issue later.