1Pete1,
I’m helping a friend with a 50, 3100, restomod that is having the same issue. He too purchased the components from Speedway, including the disc/disc master cylinder. We bench bleed the master cylinder, bleed the system starting at the farthest point numerous times with no improvement. Speedway replaced the MC under warranty and we started over again but did not solve the problem.
Has anyone experienced a bad 2lb resisidual valve? Like your system, first pump nothing, third pump hard pedal that doesn’t fade. I know this is probably improbable but, I’m wondering if the residual valves (Speedway brand) front and rear, are not holding the 2 psi on the calipers?
I’m not knocking Speedway, just looking for a common denominator.
