I'm using the master cylinder & power booster as well as pedals cage from a 1985 Mustang GT for the brake system in my 1946 Ford pickup I'm also using a proportioning valve from a 73 to 76 F100/150. Everything else is new, lines, hoses, wheel cylinders, master cylinder, booster & all. My problem is this, I cannot get a good pedal no matter how many times I bleed the system. As a starting point in diagnosing the problem I removed the outlet lines on the M/C & blocked them both off, then I tried to pump the brakes but they are rock solid. I then hooked up just the front (which are disc) & got the same pedal feeling as before, nothing. I haven't worked much with proportioning valves before but could that be where the problem is or do I have another problem. I have disc on front with drum on the rear. I can bleed the system til I'm blue in the face but never get any more bubbles out of it, just clear brake fluid. If you have any ideas or experience in this area I would sure appreciate your help. Thanks
chuck
chuck