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S40 2011 Hissing sound when depressing clutch

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
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Year and Model: 2016 V40 / 2011 XC60
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S40 2011 Hissing sound when depressing clutch

Post by PierreC » Wed Feb 12, 2020 9:02 am

A friend with a 2011 S40 has a strange problem - there is a hissing sound (like the sound when the gas escapes a soda bottle being opened) when depressing the clutch pedal - and mostly when the car is cold (i.e. first thing in the morning for the first few miles).

Reservoir is full and it is NOT the groaning noise which would indicate a thrust or throw-out bearing problem.

Any ideas what may cause this hissing noise?


2016 V40 D4 VEA AT
2010 XC60 T6 AT
2015 V40 D3 (5 cylinder) AT [Gone]
2002 V70XC 2.4T AT - Elevate Stage 1 [Gone]
2007 S60 2.5T MT [Gone]
2002 S60 2.0T MT [Gone]
1996 850 GLT MT [Gone]

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