A few weeks ago my '85 300d started exhibiting a peculiar brake problem. On initially pushing the brake pedal it is quite firm, and the brakes engage fine. With steady, moderate pressure, though, the pedal slowly sinks to the floor. Pump the pedal, and it does the same thing again and again. Brake fluid level didn't drop in the reservoir, and so I came to the conclusion that maybe the pressure was bypassing between the dual cylinders. I got a new ATE cylinder from Peach, and even a couple cans of ATE brake fluid, and swapped out the master cylinder, and bled the system with a mity-vac.
All seemed to go well, with the only problem being that it didn't solve the problem.
Any ideas on where the problem really is?
Thanks
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