Just got a new Cleveland caliper assembly for one of our club's G-103's. Grob requires the use of DOT-3 fluid because of the master cylinder. The o-ring in the piston is designed for 5056 fluid. I'm told DOT-3 will call that o-ring to swell. So we need to replace the o-ring.

Does anyone know what common o-ring materials are compatable with DOT-3?

Aircraft Spruce, BTW, doesn't sell DOT-3 compatable o-rings.

Thanks,
Larry