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Old 03-22-2011, 01:02 PM
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Join Date: Jan 2008
Location: Saratoga Springs, NY
Posts: 54
Master cylinder flakey from fluid temp?

Hello All,

1983 300D...

I have a problem with my brake pedal heading right toward the floor after about 30 minutes of stop and go driving. Once that starts, I can "pump it up" to the usual pressure at each stop. The car stops okay even when the pedal goes way down.
It has all the signs of a bad master cylinder but strangely, when you let the car sit for 5 minutes (or overnight), or you drive on the highway for a few minutes without using brakes, it behaves normally again for 30 minutes.

When I first picked it up 5 months ago, it needed both flexible front brake hoses. When I replaced them, I used Valvoline synthetic "DOT 3 and 4" fluid which was the only DOT4 available in the local parts store.

It seems like my temporary failures could be related to the heat of the fluid. I stop a lot, the fluid heats up, pedal to the floor. Let it cool a few minutes, no problem.
My question: Is it possible that I used a brake fluid that doesn't hold up to the MC's needs? Do you think if I took the car to the dealer and had them flush and replace with official MBZ fluid, my problem would disappear?

Thanks,
Garrison
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Garrison R.
'83 300D
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