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Old 02-10-2001, 08:45 PM
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MikeTangas MikeTangas is offline
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Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
It would help if you let us know what year and model you are talking about.

I'm betting it is a vacuum leak in the vacuum booster, possibly from a bad diaphram. Does it hiss whenever you have your foot on the brake, but not hiss anytime else? Does the pedal feel different since the hissing started?
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon least its a diesel

Non illegitemae carborundum.
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