slarti Posted July 11, 2004 Report Share Posted July 11, 2004 My dad's 1995 850 Turbo is losing brake fluid, I check all the calipers and brake lines and they all seem fine. When I looked under the fluid tank I noticed that the hard lines are wet and the gray paint on the transmission (I think) is coming off. After further investigation I think the leak is coming from the bottom of the ABS presure balancing unit, I felt around one of the had lines and came away with what looks like a piece of O-ring.My question is is it possible to replace the O-ring or does the entire unit need to be replaced?Thanks Link to comment Share on other sites More sharing options...
Bay13 Posted July 11, 2004 Report Share Posted July 11, 2004 replace the "O" ring. Link to comment Share on other sites More sharing options...
slarti Posted July 12, 2004 Author Report Share Posted July 12, 2004 replace the "O" ring.←Where can I get one?And do in need one that is brake fluid safe?Is there a part number or anything for that (I'm guessing not)?BTW thanks for the help. Link to comment Share on other sites More sharing options...
slarti Posted July 12, 2004 Author Report Share Posted July 12, 2004 Bump Link to comment Share on other sites More sharing options...
Bay13 Posted July 12, 2004 Report Share Posted July 12, 2004 You know, I've thought about this and I don't think there are any "O" rings on any of the fittings of the brake system, so I'm not sure what you have seen. Link to comment Share on other sites More sharing options...
Guest Guest_whilst_* Posted July 13, 2004 Report Share Posted July 13, 2004 Just replaced mine w/new Volvo one.=$180. for part.There is an O ring inside lower fitting-NON replaceable!Dealer has in stock-so you know it's NOT infrequent failure.'94-854T. Link to comment Share on other sites More sharing options...
slarti Posted July 13, 2004 Author Report Share Posted July 13, 2004 Guest_whilst_*Posted Yesterday, 07:46 PM Just replaced mine w/new Volvo one.=$180. for part.There is an O ring inside lower fitting-NON replaceable!Dealer has in stock-so you know it's NOT infrequent failure.'94-854T.It is leaking from the lowest fitting. How hard is this to replace? Are there any pitfalls I should be avoiding? Link to comment Share on other sites More sharing options...
slarti Posted July 17, 2004 Author Report Share Posted July 17, 2004 I have a new problem, my dad accidentaly used a bottle of DOT 5 brake fluid to top off. I've heard that DOT 5 will eat DOT 4 brake systems. I have opened a couple of fittings on the balancing unit and pushed about a liter of DOT 4 through it. Anyone have any suggestions of what I should do next?My dad is not so bright. Not really a details guy. :angry: Link to comment Share on other sites More sharing options...
Bay13 Posted July 17, 2004 Report Share Posted July 17, 2004 Ya bleed the entire system, all the calipers as well, and see what happens. If the seals are gone, start replacing them as you find them. Link to comment Share on other sites More sharing options...
Guest Guest Posted July 17, 2004 Report Share Posted July 17, 2004 Have Motive Product overnight you their power brake bleeder(motiveproducts.com).I have this product and it works like a charm for thoroughly flushing the brake system.In the interim- flush the system starting at the farthest wheel from the master brake cylinder .Follow up with the power flush. Either DYI, or get it to a mechanic first thing Monday am.\Good Luck !NateB Link to comment Share on other sites More sharing options...
Guest ex-Volvo Posted July 18, 2004 Report Share Posted July 18, 2004 Just to be certain we understand what part you are talking about....There is a brake proportioning valve that consists of a small cast metal part, and which is not part of the ABS system. Then there is the ABS modulator pump, which also has multiple hydraulic connections and is usually beneath the ABS ECU.The proportioning valve should be fixable or even replaceable at reasonable cost. But the modulator pump is generally not serviceable and costs big bucks (>$1000). In either case, recommend you look at salvage parts. Link to comment Share on other sites More sharing options...
Bay13 Posted July 18, 2004 Report Share Posted July 18, 2004 The brake bleed for the 850 is LF, RF, LR, RR. It doesn't follow the old school of starting with the farthest from the master cylinder. Link to comment Share on other sites More sharing options...
slarti Posted July 18, 2004 Author Report Share Posted July 18, 2004 Thanks for the input everyone.I have a question though, if I flush the entire system isn't that going to allow the DOT 5 to get in to and mess up everything? Link to comment Share on other sites More sharing options...
ShadeTek Posted July 18, 2004 Report Share Posted July 18, 2004 The brake bleed for the 850 is LF, RF, LR, RR. It doesn't follow the old school of starting with the farthest from the master cylinder.←I take it the above procedure is for LHD cars? RHD cars would be RF, LF, RR, LR. Link to comment Share on other sites More sharing options...
Bay13 Posted July 18, 2004 Report Share Posted July 18, 2004 Don't know about RHD cars. I saw one once, it was a diplomats with DC plates, I don't remember which side the brake master cylinder was on. Much of what was under the "bonnet" was the same as the LHD cars. So my guess would be just bleed from the closest to the farthest. Link to comment Share on other sites More sharing options...
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