o-rings that seal caliper halves

[850oldschool]

I just ordered 10 o-rings from this Porsche and Alfa brake specialist:

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

They are square cut EPDM o-rings. Many of the vintage Porsche and Alfa-Romeo cars came with smallish 2 piece Ate rear calipers which look very similar to the Ate rear calipers on Volvo 850's.

I have to admit that the pictures of restored Porsche calipers with original spec yellow zinc plating looked really sharp.

[850oldschool]

Fitment confirmed! These are, in fact, the real deal. PMB appears to have a well deserved sterling reputation in the vintage Porsche community.

If you're not a putzy weirdo like me, you probably don't have to worry about these, just clean them up what you have and reinstall them. However, if you pick up a deal on a used caliper and what you receive are the two separate iron pieces in good condition in a box, minus all the rubber parts and other doodads, it could be pretty useful to know where to get these o-rings.

It should also be noted that the standard hardware store o-rings are usually made from buna-n, which is not recommended for exposure to brake fluid. So at least make sure whatever o-ring you install is EPDM.

I have to admit that this little adventure started me wondering if anybody has successfully used silicone bathtub caulk in place of these o-rings.

[JimBee]

Centric (decent quality) makes the kit with all the parts you need:
https://www.partsgeek.com/bhxqqfh-volvo ... tent=Volvo&

[850oldschool]

I looked at the Ate kit and several others which all lacked the two little o-rings, so I just bought the Ate one. I guess I should have looked a little harder!