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I'm bringing this thread up from the dead because I am having the same issue, but for a seemingly different reason.

I am also running a proportioning valve in my rear brake line and I thought that the original poster's fix would be a "voila" moment for me, but no amount of proportioning valve adjustment will give me more than 800psi to the front brakes. The rear brakes are also at 800 psi when allowed to get full flow from the valve.

I have played with the pedal ratio. The stock M/C pickup point is 1.5" below the pivot. The hole I drilled is 2.125" below.

The lower hole has a lower ratio, yet that's where I get the best pedal and pressure.

The problem with using the upper hole is that the brake pedal has a super long throw, and it barely makes 500lbs before hitting the floor.

When I do the calculations I get 7.6:1 for the top hole and 5.4:1 for the bottom.

Any suggestions? I'm ready to pull out what little hair I have left

BTW, this setup is in a '60 Dart. I am running '99 Ram front calipers and '04 Cobra calipers in the rear with a Wilwood 7/8" M/C.

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