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Brake Booster Check Valve Hose Question

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, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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scot850
Posts: 8886
Joined: 05 Apr 2010, 14:46
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
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Re: Brake Booster Check Valve Hose Question

Post by scot850 »

Not sure how air gets into the brake lines from the check valve. It is pressure operated from the manifold and works on supplying pressure to the booster diaphragm to help reduce the pedal pressure. when it starts to fail you get the harder pedal like you have no boost support and you have to use both feet on the pedal even from backing up speeds. Mine started doing this initially and then worked fine in regular driving. Swapped it out and it returned to normal.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

warmblood58
Posts: 163
Joined: 24 Feb 2016, 09:42
Year and Model: 1989 245
Location: Medford
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Post by warmblood58 »

Found a near carbon copy brake booster check valve at Napa -10.00 and change which is about what these are worth -

Part number on box reads 89000 17009 36-B616

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