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automotive vacuum pump


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I have a hand-operated vacuum pump/gauge for testing purposes and brake fluid changes.  It has lost its ability to pull a vacuum, apparently because the plunger part no longer seals against cylinder walls. How can I fix this?  Should I try using cooking oil or silicone spray?  I'm concerned that cooking oil might cause deterioration in any rubber parts.

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Welcome to the forum.


My speculation is that usage during brake fluid changes caused an accidental fluid intrusion into the pump.


The fix would be disassembly and o-ring replacement. It might be possible to match at the local hardware store. The manufacturer might offer a replacement.


Mine is decades old and still pulls a vacuum.

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  • 6 months later...

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