Hello All,
I’ve been wrestling with a brake problem since I’ve switched to disc up front, 74 Duster originally drums all the way around. Installed factory disc up front and then installed Dr. Diff 10” drums in the back, new brake lines, SBP to LBP all the way around. Installed Dr. Diff aluminum master with 15/16 bore and a distribution block from inline tube (
1969-1974 Mopar A-Body Disc or Drum Brakes Distribution Block).
My question revolves around the distribution block, Inline tube calls it a distribution block but Dr. Diff site calls a similar item a proportioning valve (
Mopar 1 Piece Proportioning Valve). I can’t figure out if these are one in the same or if the inline tube one is actually a distribution block and Dr, Diff’s is a proportioning valve.
I’m wrestling with this because my brakes don’t seem to want to stay bled. Master was bench bled and the whole system bled just fine. When I bleed the brakes I have great brakes for several weeks but then they start to get mushy and I have to eventually bleed them again, rinse repeat. I see no apparent fluid leeks at any of the junction points and when I bleed the brakes the air seems to only be upfront. I’ve replaced the master several times and now I’m starting to wonder if it comes down to the distribution/proportioning valve. Additionally, I started to read about and wonder about any residual pressure valves. Any and all constructive information/criticism welcome.
