Ok so I actually bought the earlier VIN ATE Master Cylinder 0044300901 and it has no fitment problems as far as i can tell. I ran into a problem though. My brakes are gargantually heavy and require immense effort to stop the car. I get about 2 seconds of booster pressure then the pedal falls to the stiffest spot on earth before the metal, accompanied by a gas leak noise, and then if I try to bring the car to a complete stop, there is a loud clunk you can feel from behind. I beleived the Oring on the m/c was bad so i went to change it with a fresh spare i had on hand. 8 hrs after I drove i went to get to work and when I uncoupled the booster line the vacuum rushed to equalize, indicating the booster held vacuum, and a later test with a the new oring on and a mityvac in hand confirmed the boosters air tight. *I love that.*
I need to pick up another liter of Pentosin DOT4LV to rebleed the brakes, and I am wondering if I just messed up bleeding the new m/c and brake lines with my pressure bleeder. I heard that badly bled lines would be gummy not stiff though.
Could it possibly be the booster's pushrod? Can you adjust an 83 300SD booster pushrod & if so how do you do it properly?
Also the M/C I bought for this booster is the correct M/C as according to the snippet from the W126 FSM: see attatched
