Archived from the Tools In Action forum (Test & Measurement). This thread is read-only.
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.
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.
I want to buy a vacuum pump can you suggest the best and cheap one please. Thank you
Welcome to the forum.
The Mighty Vac hand vacuum pump kit has been a solid performer for me for decades.