Just did complete brake job on 63 230sl; brake cylinders replaced, master cylinder, etc. I bled the brakes, and thought all was well, but each time brakes are applied, the brake pedal doesn't return to original position. Note: When bleeding, I accidently pushed the brake pedal all the way to the floor. Am wondering if this could have damaged the o-rings in the master cylinder, or damaged the brake booster (which I did not replace).
If I push on the mechanism (pushrod) where it comes thru the firewall and goes into the booster, the pedal returns to full up position, only to have the same thing happen again when the brakes are next applied.