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Old 03-27-2023, 06:04 PM
plehrke's Avatar
plehrke plehrke is offline
Join Date: Sep 2006
Location: Defiance, MO
Posts: 2,123

Originally Posted by Roadjunkie1 View Post
I have seen the Van's recommendation for the "O" rings with the lower temperature tolerance but have not seen the rational for that recommendation. Did I miss something? Curious minds want to know.
My rational:

Original Cleveland are good to -65F
McMaster Carr Viton are good to -15F
Vans GLT Viton in U-00015 are good to -40F

I take off in winter at 15 to 20F often. Std temp lapse rate makes that approx -10F at 8,000ft. An hour there will have cold soaked the calipers and O-ring to -10F or -15F. I land and touch brakes and o-ring is cold and hard. Sure, once brake pads start touching you get a bunch of heat but maybe a bunch of fluid has already squirted past the hard o-ring.

YMMV if you never fly in cold weather.
RV-6A - flying 1000+ hours
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Last edited by plehrke : 03-27-2023 at 06:06 PM.
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