I just installed a new master cylinder and no matter how many times I bleed the brake lines on my '71 911E, the brakes are still useless......I am using the one way valve on a hose, then opening the bleeder valve and pumping the brakes, method. I pump about 30 times with no bubbles, then closing the valve, refill the reservoir, and do it again. I tried bleeding the master cylinder, too. I have bled them about 5 cycles per corner now, and they are still bad. If I pump the brakes about 30 times really fast after a bleed, then they start to get stiff, but loose the pressure the second I stop.
Can anyone help????
