Brakes overheated-must I replace calipers

enblethen wrote:
One thing to look at is whether the pistons are aluminum or the bakelite type material. The aluminum ones can handle and dissipate the heat faster and more efficiently then the synthetic material.

Interesting philosophy. I always though one would want to isolate the heat from the fluid, rather than conduct it to the fluid. That is usually the purpose of the bakelite, so the fluid doesn't boil. The only problem with bakelite is that it is hygroscopic, and expands when it absorbs moister. Technically Titanium would be the best, because it would never rust or absorb moister, yet does not conduct heat. Mine are stainless which also tends not to conduct heat.