Please don't let this thread drift off topic as to why I'm not using an aviation brake fluid. What I'm using is working great for me in the RV-12 (and I'm not advocating others use the same brake fluid I'm using).
I've been using a synthetic Amsoil automatic transmission fluid as brake fluid for four years now because of the much higher flash point than standard aircraft brake fluid. The Amsoil flash point is 467°F ... a few degrees higher than my backup choice of Mobile 1 synthetic ATF (which can always be added if on the road since it is available at most any auto parts store). The higher flash point is way beyond the 250°F or so limit of the caliper piston's Buna N rubber O rings that come from Matco ... so was thinking of changing over to Viton O rings which are rated to around 400°F.
I was on the phone today with Matco ordering some spare parts for the Matco MHE51-B wheel/brake assemblies used on our RV-12's. While on the phone with Matco, asked if they offered Viton O rings for the caliper's piston .... nope, they only sell the Buna N rubber O rings.
So my question is ... have any RV-12 owners switched over to using Viton O rings on the Matco caliper piston? If so, who did you purchase the O rings from and what was the part number?
Happy flying,
I've been using a synthetic Amsoil automatic transmission fluid as brake fluid for four years now because of the much higher flash point than standard aircraft brake fluid. The Amsoil flash point is 467°F ... a few degrees higher than my backup choice of Mobile 1 synthetic ATF (which can always be added if on the road since it is available at most any auto parts store). The higher flash point is way beyond the 250°F or so limit of the caliper piston's Buna N rubber O rings that come from Matco ... so was thinking of changing over to Viton O rings which are rated to around 400°F.
I was on the phone today with Matco ordering some spare parts for the Matco MHE51-B wheel/brake assemblies used on our RV-12's. While on the phone with Matco, asked if they offered Viton O rings for the caliper's piston .... nope, they only sell the Buna N rubber O rings.
So my question is ... have any RV-12 owners switched over to using Viton O rings on the Matco caliper piston? If so, who did you purchase the O rings from and what was the part number?
Happy flying,
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