Attached I have a couple pics of the break booster I just pulled from my 84 300D.

This brake booster was flooded with brake fluid and not holding vacuum. When I bought the car from the previous owner last March he mentioned he had recently replaced a leaky master cylinder. No idea how long it had been leaking for.

It looks salvageable to me. No degradation of the rubber as far as I can tell. A lot of the rust is surface rust for the few days I've had it taken apart, with the exception of that spot I zoomed in on where the brake fluid was pooling.

Questions on my mind:

1. Is my best course of action to sand all the metal down and repaint with Miracle Paint? Or sand down and apply some silicone-based (rubber safe) coating? Or maybe only paint the really bad spot? Assuming the paint has plenty of time to cure, the only negative I would anticipate is that a future MC leak could cause more of a problem (with internal paint flakes getting in places they aren't supposed to be)

2. Should I do anything to the rubber? Someone in an old thread mentioned letting it soak for 30 minutes in silicone lubricant. I have the WD-40 Silicone Spray on hand. Is there something else I should be using for this kind of thing?

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Call Karp's Brakes in CA, they may sell you only the parts and then the rubber would be new.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

Thanks, I sent them an email today.


The diaphragm looks looks really good after cleaning it up. I suspect this unit was remanufacturered in the not too distant past, particularly seeing as it has a Girling sticket on it.


My problem right now is that I stripped some of the threads on one of the large bolts while attempting to get one of the nuts loose. If anyone has these bolts from an otherwise bad brake booster, I'd love to buy them.

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