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lransburg Samba Member
Joined: July 28, 2020 Posts: 1 Location: Fort Wayne, IN
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Posted: Sat Sep 05, 2020 4:10 pm Post subject: Engine revs up when I apply brake pedal |
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I have a 1971 bus with Westfalia weekender package. When I brake, the engine revs up, and when I release the pedal it returns to normal. The pedal is hard to press, but I’m able to stop. I’ve seen some posts that said their idle decreased when braking, and the problem could be either vacuum line or servo. What about when idle increases when braking? Any ideas? |
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SGKent Samba Member
Joined: October 30, 2007 Posts: 41031 Location: Citrus Heights CA (Near Sacramento)
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Posted: Sat Sep 05, 2020 4:31 pm Post subject: Re: Engine revs up when I apply brake pedal |
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bad booster _________________ “Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin |
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Abscate Samba Member
Joined: October 05, 2014 Posts: 22568 Location: NYC/Upstate/ROW
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Posted: Sat Sep 05, 2020 6:44 pm Post subject: Re: Engine revs up when I apply brake pedal |
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The leaky booster is letting in more air into your intake.
Get this fixed so that you can stop, and before the lean running hurts your engine _________________ .ssS! |
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SamboSamba22 Samba Member
Joined: August 06, 2015 Posts: 2772 Location: Benton, Arkansas
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Posted: Sun Sep 06, 2020 8:03 am Post subject: Re: Engine revs up when I apply brake pedal |
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Check the vacuum lines that run from the intake manifold in the engine bay to the plastic hardline section that goes to the brake booster up on the front beam.
You could very well have a bad brake booster, but sometimes its a hose or piping issue. Stress fractures in the plastic tube can cause surges or bog-down symptoms when present, same with the vacuum hose being 45 yrs old.
Sam _________________ The Bus Barn Ltd. Co.
Oct. ’67 Double Cab (’68 Crew Cab)
[url=http://www.vw-mplate.com/mplate-44412.png]Click to view image[/URL]
March '69 Delivery (Panel Bus)
[url=http://www.vw-mplate.com/mplate-44414.png]Click to view image[/URL] |
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