|
I can't get a high firm pedal. The brake pedal goes down to about 1 inch from the floor, and it won't pump up.
The master cylinder was the first thing I replaced, a year ago, and I've isolated the problem to the rear brake circuit by the fact that the pedal becomes normal when I block off the rear circuit at the master cylinder. I've replaced the rear wheel cylinders and the one rubber brake hose in the rear. I've replaced the power booster, I've adjusted the master cylinder pedal play, and the power booster rod play. I'm not exagerating when I say I've bleed the brakes 30 times...I've power bled them, I've vacumm bled them, I've bled them with another person pumping, and I've bleed them by myself using some wood pieces to hold the pedal down. I've had brake pressure gauges on the master cylinder and on the rear wheels and I seem to be getting plenty of pressure (max: 75-90 bar), and I can lock the wheels so that I can't turn them by hand. But the brake pedal still goes down almost to the floor. The rear brake shoes are recent, I've measured the rear drums, I've adjusted the brakes innumerable times.
One thing I couldn't do was use the new y-adaptors that came with the new rear wheel cylinders. The metal brake lines going into both rear adaptors are frozen and it looks like I'll break a line if I keep trying to loosen them. That also limits trying to isolated the problem by blocking off the lines at each rear wheel cylinder.
That's it in a nutshell...
John
|