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Brake Booster Problem?

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

sandytrean
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Joined: Fri Oct 17, 2014 9:42 am
Year and Model: 850 Wagon Turbo 1996
Location: Kansas
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sandytrean

Brake Booster Problem?

Post by sandytrean » Wed May 25, 2016 10:29 pm

I think I have a bad brake booster, but I want to confirm before I burn a few hours doing the replacement job.

I get a hiss when I press on the brake pedal. I'll upload a video of the sound in the morning.

I also am able to pump the brakes up a bit when stopping. Its very slight. I'm replacing pads and rotors soon, so I'm hoping that will fix it, along with a flush.

Is my hiss from the brake booster, or just the check valve/vacuum leak. I have a booster from the junk yard, but I really don't want to install the thing just to find out it isn't good. Is it possible to test a booster when it is off the car?
The other project: http://imgur.com/a/yz98a

scot850
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Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
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scot850

Re: Brake Booster Problem?

Post by scot850 » Wed May 25, 2016 10:46 pm

Check for leaks in the pipe to the servo from the engine. The pipe can become crumbly with age.

The issue you are talking about could well be the check valve leaking which they can do as they get older. Part # for the replacement check valve kit for 95-97 850 is : 271632

Part is around $40 US on various on-line Volvo dealers.

Option is to pull one from a junkyard and hope it is ok.

I'd do these 2 things first before spending money on a booster and all the work involved with that.

Finally check the brake fluid level. Are you losing any fluid? The brake master cylinders leak into the booster and you may not see a leak.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
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

sandytrean
Posts: 5
Joined: Fri Oct 17, 2014 9:42 am
Year and Model: 850 Wagon Turbo 1996
Location: Kansas
Has thanked: 0
Been thanked: 0
United States of America
sandytrean

Re: Brake Booster Problem?

Post by sandytrean » Thu May 26, 2016 9:50 am

Is there a way I can diagnose the problem to the check valve?
The other project: http://imgur.com/a/yz98a

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