Power Disc Brakes not working on hard stop?

Dartman61 said

Yes, That is the exact feeling I get with both systems (cars). I've traded emails with both Dr Diff and SSBC and neither have any suggestions for me. Are you also running 14 inch wheels with the small bolt pattern?

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I am running 15 inch SBP cragars. 195 width tires up front, so I should be able to skid them pretty easy.

Have you tried opening the front and back bleeders to see if the pedal goes to the floor? That might be a way of isolating the problem.

I was going to try that, but I haven’t got to it yet.

Also thought about loosening the master cylinder up about 1/2 inch (or as long as the bolts are & see what that does.

Need to figure out how to divide & conquer….