My 1981 300SD had a simple brake pad job (DIY of course) but I decided to change the fluid as well. Upon refill and pressure-bleeding all four wheels, I cannot get a hard pedal. Thought it was the master cylinder, so changed that 40 year old cylinder out. STILL cannot get a hard pedal (engine shut off). Is my power booster also shot? Any feedback on how to accurately diagnose that issue is much appreciated!
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