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C70 Updates/ rear caliper question and Thanks Topic is solved

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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subzerocarfanatic
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C70 Updates/ rear caliper question and Thanks

Post by subzerocarfanatic » Tue May 12, 2020 9:07 am

I just want to start by saying I love coming here and love the community based help I get here,without you guys I would not be so close to having our C70 Convertible near ready to drive.I have addressed everything from leaks, to brakes, suspension issues and fixes and none of this would have been as easy as some of it was without you guys. I have the car running, all new suspension and all new brakes, I did find the leak on the rear calipers after installing new rotors and pads.
I have a question though,the rear caliper splits in to 2 pieces,where the small holes are so the brake fluid flows from one caliper half to the other and the 2 halves but together is where my leaks were on both sides,should there not be a small o-ring where the small recessed area around each caliper half mounts together?

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Re: C70 Updates/ rear caliper question and Thanks

Post by JimBee » Wed May 13, 2020 8:29 pm

There are 2 tiny o-rings that fit into the recesses to seal the transfer of fluid between the halves.
You can see them here:
https://www.partsgeek.com/rz2gfry-volvo ... tent=Volvo&

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Re: C70 Updates/ rear caliper question and Thanks

Post by subzerocarfanatic » Wed May 13, 2020 9:10 pm

I managed to find 4 small o-rings that fit perfectly in the recessed area where the calipers split,it fixed my leak issue. The image referenced shows the caliper piston seal and piston o-ring seal,the smallest one is the bleeder valve cap.
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58F706FF-CC12-4B31-8C15-258CB87CC78E.png

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Re: C70 Updates/ rear caliper question and Thanks  Topic is solved

Post by 850oldschool » Thu May 14, 2020 9:16 am

The best kind of rubber for braking systems is EPDM. O-rings intended to seal oil in engines and hydraulic systems are usually nitrile (buna-n). The proper o-rings to seal the caliper halves have a square cross section, unlike standard o-rings, which have a circular cross-section. The only place I've been able to find the right o-rings is here:

https://www.pmbperformance.com/catalog/ ... 694936.htm

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Re: C70 Updates/ rear caliper question and Thanks

Post by 850oldschool » Thu May 14, 2020 12:02 pm

There is also the Centric 143.39003 rebuild kit. It's the only kit I know of that has the seals which go between the caliper halves.

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