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Old 02-10-2001, 09:45 PM
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MikeTangas MikeTangas is offline
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Join Date: Apr 2000
Location: So. Cal
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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?
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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

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