OK everyone. Here is a challenge. Whoever leads me to the right solution WILL get a prize. Imp not kidding either, I will get you something for solving this problem because it is odd to say the least!!! Ready??? Here we go: Myself and another board member (Dennis) totally re-built my rear. Today I put it back in with new rear drum brake pistons. Here is where the fun starts. I used a vacuum bleeder on the rear, but there was so much air it simply wouldn’t bleed out. I ran 2-3 pints of fluid through this bastard and it just wouldn’t bleed at all. After about 2 hours I called for help. So, Dennis comes over, we bleed the master, that didn’t work. While pumping up the brakes we find that my rear line at the block by the master cyl. was loose and introducing air into the system. OK, tightened that up and continued the to bleed the rear brakes. After a while of manual break bleeding the rear brakes were pumping up really nice with no air coming out. Nice solid peddle. At this point, we moved to do the front brakes just for good measure. The fronts were never opened at all and the car always broke well. This is where things went bad. I pump up the brakes, then Dennis cracks the bleed on the front pass side. OK, no problem. When I go to pump up the brakes again, they are really soft as if there was a whole bunch of air in it??? The fluid is also very foamy. We go again, and again and again in the front and no improvement at all. We checked around and there are no leaks, nothing. Everything seems ok. We move to the front drivers side, same thing. The barely any fluid coming out and its all foam??? What is the deal with the foamy fluid? We bleed the front over and over again with little to no improvement. We then moved to the back. The brakes pumped up a little (I would get 2-3 inches from the floor pump up) and when cracked there was no air. We keep bleeding and bleeding and no improvement. We at this point said screw it and gave up.
So, the history on the car is this: it is a running car and always broke really well. Only the rear brake lines were disconnected to remove the rear end. I installed new brake cylinders.
My questions:
Why would the brakes pump up nicely and then when you went to bleed the front, go soft and then not be able to bleed them out?
If the master cylinder went bad, would it hold any kind of pressure on the system? The rear brakes squirted more fluid out than the front. Why, is there some valve causing this?
Why would we have great pressure on the rear brakes then when we cracked the front bleeders go totally soft?
Can pumping the brake pedal too fast foam up the fluid and cause a soft pedal?
I talked with Vikki and she said she had the same problem with her’s. She said screw it around 1am, and the next day the brakes were ok. Why?
