Kelsey hayes o-rings

Kendog 170 said

I seem to have bad luck cutting the o-ring when reassembling the KH 4 piston calipers. It sucks to have to buy a complete kit so I've found what looks like the right size o-ring but not a suitable material for brake fluid. I know Natural Rubber or Silicne will work as well as some other just can't find them. Here's what I believe they are size wise but could be wrong. I wanna buy a 100 pack if I can . Anyone try to do this ?
McMaster-Carr

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I have no idea why your trying to use "O" rings for piston caliper seals on the Kelsey Hayes disc brakes, but if you are, you're doing it all wrong.
Caliper kits are easily available from Raybestos, Centric, Rock Auto, vendors.

If your installing pistons in the calipers, and are ruining the seals, your not doing it correctly, not lubing up the seal, bore, piston, with slippery lube or you need to learn a different technique in piston installation.
They are not hard to do, but if your a beginner it may be a learning experience on your part.