Brake help.

[LaOtto70Charger]

I am still battling my ssbc disk brakes and trying to figure something out.  In July I got need floor boards put in and reblead the brakes and was getting 1200 psi at very bottom of pedal stroke.  Had the rear drums hang going down the highway and traced that down to rear brake hose.

  Replaced it, redid the rear drums, and added a 10 psi residual pressure valve.  Everything was working ok but still not getting 1200 psi until almost the floor.  Brakes locked up though so just went with it. 

Two weeks ago the emergency brake spanner bar popped out on the left rear side and was bouncing around in there.  Popped the rear drum off and fixed it.  At the same time verified the adjustment on both rear drums.  I thought since I was dirty I would check the master cylinder rod adjustment.  I must have measured wrong since I had a 0.25" difference before it would be engaging.  So I adjusted it. 

Next day I had very little brakes.  Only getting 600 psi now.  Picked up a new master cylinder and bench blead until no bubbles and same thing with the new one.  Put the old back on and reblead everything again.  Since it is power brakes I had the vehicle running since that helped last time.  Brakes engage and stop the rotor from rotating by hand about half way but doesn't build much pressure.  I checked vacuum and it was 15 psi at idle slight throttle and jumps to 20 psi.  Engine off and brakes slightly on the pedal goes down some when the engine turns on like I think it should. Pedal doesn't feel spongy and pumping doesn't seem to affect psi amount.

Oh both master cylinders are the A body ones with the smaller bore.  I still have the original distribution block and the brake light doesn't come on.  The power booster is the original for a all drum setup which I did replace a couple years ago.  Also the prop valve from ssbc is rotated all the way in/clockwise.  I tried half way out but brakes felt no different.

Not sure what else to do other replace the power booster or the distribution block.

[fy469rtse]

Its something to do with what you have replaced and adjusted ,
time to back track on what changes youve made, no other way because cant be there to help you

[LaOtto70Charger]

What is bugging me is the only thing not back to what I had before is the master cylinder rod length.  I did rotate it back in to where I started but that didn't have any affect.  So now I have it at a length just a little bit short of depth of the piston in the master cylinder.  So I am down to maybe the wheel cylinder got messed up putting the emergency brake bar back in or the power booster got damaged adjusting the rod.  What I don't get on either of those being the problem though is the calipers/drums at all four corners start holding the rotor/drum at half pedal travel.  I have a gauge to put in the front calipers and starts climbing at this point.  Quickly goes to 500 psi range until the pedal hits the floor.  Than it only goes higher if I get in the vehicle and two pedal it.