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Re: Brakes intermittently inoperative
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Posted by Bernie [Email] (#1501) [Profile/Gallery] (more from Bernie) on Tue, 8 Aug 2023 16:33:47 Share Post by Email
In Reply to: Brakes intermittently inoperative, LawrenceJ [Profile/Gallery] , Mon, 7 Aug 2023 16:05:37
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Hello,
The problem being intermittant actually points to the pipe/check valves. If you were just on the gas even slightly there will not be any engine vacuum produced and possible neutral or positive pressure in the intake. With a faulty checkvalve this pressure or absence of vacuum will be present in the brake booster giving you a hard pedal. Most manual cars do not have the vacuum pump and function fine. It is mostly on the automatic to provide a little extra vacuum especially on cold start. But I know of no remanufacutured pumps. But they rarely fail so a used one would be fine. So you might want to remove the vacuum pipe/check valve assembly and see if you can blow both directions through the check valves. Good Luck, Bernie
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George Riggin Specialty Automotive
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