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Old Feb 13, 2015 | 07:57 PM
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Default rpm rise

350 auto with power brakes

is a problem showing when you put your foot on the brakes in park/netural/gear, and the rpm's rise by a couple hundred?

or is it normal?
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Old Feb 13, 2015 | 08:01 PM
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Originally Posted by riverracer au
350 auto with power brakes

is a problem showing when you put your foot on the brakes in park/netural/gear, and the rpm's rise by a couple hundred?

or is it normal?
That is not normal, and you may have a vacuum leak in the line from the back of the carb to the brake booster. Disconnect from the brake booster ,plug and re-test.
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Old Feb 13, 2015 | 08:16 PM
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only has a short hard line and a short piece of hose.

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Old Feb 13, 2015 | 08:56 PM
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Originally Posted by riverracer au
only has a short hard line and a short piece of hose.

That is correct. Remove from the brake booster and plug the line to the carb or connect a vacuum guage on the hose. Then when you apply the brakes see if the vacuum continues to change.
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