Idling Problem?
Racer
Joined: Dec 2007
Posts: 445
Likes: 2
From: Thomastown Mississippi
Yep, my '77 does the same thing. I'm just guessing, but that brake booster is vacuum operated, so I figure when you depress the brake pedal, it draws a vacuum for the booster, momentarily changing your idle. I think mine idles back to normal after a few seconds.
KC
KC
Drifting
Joined: May 2008
Posts: 1,462
Likes: 43
From: Choctaw Country
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
The vacuum in the booster should be captive, so if the idle goes up (and stays up), I believe it means there is a perforation in the diaphragm causing a vacuum leak when the brakes pedal is depressed.
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