High and erratic idle plus air hissing from brake pedal

Asked by Zak Sep 01, 2017 at 03:25 PM about the 2004 Volkswagen Jetta GL Sedan FWD

Question type: Maintenance & Repair

I'm having a problem with my 2004 2.0L jetta.
When the engine is warm the rpms bounce up and
down from 850 to 3000 with the a.c. off. With the
a.c. on it bounces from 850 to 2200. I also hear a
constant hiss of air from the brake pedal

2 Answers
40,015

beatupchevy answered 7 years ago

sounds like you have a vacuum leak , it could be causing all that other fuss , see if you hear the hiss from under the hood by the master cylinder

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Christian answered 7 years ago

Check the hose going to the brake booster. You definitely have a vacuum leak, that is the hiss sound. If you hear it around the brake pedal area, that means it has something to do with your brake booster, either the booster itself has gone out (possible) or the hose going to the booster is cracked or fell off.

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