I am about to give up on this brake project! Man, I just took the new MC off again and bench-bled again, re-installed and bled all the lines. There is no air in the lines! The pedal starts to feel hard after bleeding, but as soon as I start the engine the brake pedal sags like a limp noodle.
New Booster, new vacuum hoses, new M/C, new fluid.
What would cause this?
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?