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Troubleshooting braking issues with vacuum pump

2419 Views 9 Replies 4 Participants Last post by  Tom Mobley
Hi all,

After replacing the rag joint on my 67 SS, I went to take it for a test drive. Good news is that the steering is working fine. The bad news is that the brakes were barely holding with me literally standing on them at each stop sign. Needless to say, I ended the test drive early and have the car safely back in the garage. I have an SSBC electric vacuum pump kit installed (previous owner). I'm suspecting the vacuum switch, but is there a way I can verify that? I want to avoid ordering unnecessary parts if possible.

Thanks as always for the great advice!
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T a gauge into the hoes between the pump and booster. this will tell you how much vacuum you have and if it holds after the pump shuts off...

also check how much vacuum the engine has- if it has anywhere close to 15" of vacuum at idle, ditch the vacuum pump and run a hose to the biggest port on the base of the carb.
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