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Brake Booster Vac Line Replacement

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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misha
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Year and Model: '97 850 2.5 20v
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Re: Brake Booster Vac Line Replacement

Post by misha » Wed Nov 07, 2018 1:47 pm

It's that or valve is on it's way out.
I vote for a bad vacuum hose.
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vovo850
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

scot850
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Re: Brake Booster Vac Line Replacement

Post by scot850 » Wed Nov 07, 2018 3:20 pm

+1 with misha on this. If the issue is mostly when cold, it is most likely the plastic one way valve on the front of the booster where the vacuum pipe from the intake goes to the booster. The first sign this is failing is when you get a hard pedal in the morning or when sitting for some time. Pull one from the junkyard and swap it out. They do fail but not often.

Neil.
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2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
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1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

vovo850
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Re: Brake Booster Vac Line Replacement

Post by vovo850 » Wed Nov 07, 2018 5:23 pm

Thanks guys, I obviously didn't look at it yet but I was sweating it was the ABS.
This makes me feel easier, sorry for the hijack.
1995 Volvo 850 GLT N/A automatic wagon

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