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2001 v70xc awd Brake pedal hiss upon let off

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R
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xHeart
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Re: 2001 v70xc awd Brake pedal hiss upon let off

Post by xHeart »

I did not hear hissing either at pressing the brake pedal or releasing it; others riding with me pointed out often. Our daughter wouldn't drive it.

Uncertainty has no place, therefore 2001 V70XC - Brake Booster Service viewtopic.php?t=100960
Last edited by xHeart on 21 Oct 2023, 08:23, edited 1 time in total.
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Golden-German Shepherd | 2021 XC90 T6 INSCRIPTION (Nexa) | 2020 V60CC (Frska) | 2013A XC90 (Lktra)
Past: Golden Retriever | 2001 V70XC | 1997 Volvo 854 | 1989 Volvo 740 GL | 1979 Volvo 240
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jonesg
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Post by jonesg »

i wonder if its possible to monitor the brake vac pump duty cycle.
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vtl
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Post by vtl »

jonesg wrote: ↑21 Oct 2023, 01:33 i wonder if its possible to monitor the brake vac pump duty cycle.
I think it's a closed system.
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xHeart
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Post by xHeart »

vtl wrote: ↑21 Oct 2023, 07:55
jonesg wrote: ↑21 Oct 2023, 01:33 i wonder if its possible to monitor the brake vac pump duty cycle.
I think it's a closed system.
VIDA/DiCE procedure, or a vacuum test, vtl?
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Golden-German Shepherd | 2021 XC90 T6 INSCRIPTION (Nexa) | 2020 V60CC (Frska) | 2013A XC90 (Lktra)
Past: Golden Retriever | 2001 V70XC | 1997 Volvo 854 | 1989 Volvo 740 GL | 1979 Volvo 240
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jcz26
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Year and Model: 2006 XC70
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Post by jcz26 »

I disagree that this is normal, I was a warranty inspector for many years, and found that the vacuum diaphram (in the brake booster) would leak and cause the hissing sound.
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