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@Zdrenka
Post Mount calipers (to some extent) also rely on Friction forces since they are partly pushing towards the mounts. When braking these are increased on a normal setup and therefor helping. When mounted the other way round these will decrease.
Shear forces are almost equal but you'll add pulling forces on the caliper aswell. The caliper is most likely designed for pushing forces so this could have an effect on the functionality of the caliper.
Ok, so maybe its not a catastrophy but I think its a bad solution to an almost nonexisting problem (for crossbikes).
Maximum braking forces will be exerted when braking on pavement and most mechanical brakes will not be powerfull enough to lock the wheel. Atleast the ones I've tried.
I use a slowrelease on my CX bike with discs. Its the halo ones. http://images.jensonusa.com/large/hu/hu295z12blk.jpg
They have small lips on the "nut" end so it should be less likely to undo itself.