Brake pad grease carbonization with track use

JB1

I decided to leave the shims in place for the trackday I did in October. I used the Permatex grease as mentioned by Chris and it did didn't carbonize as the stock grease that was on there before, it only dried out a bit.. Track was Road America and I can assure the brakes did get hot!

I understand the shims might add a little sponginess to the pedal feel, but as I am not a pro racer, that didn't bother me too much. Reason I left the shims in place is I thought it might help to keep the heat away from the pistons a little better. Is this a completely bogus thought or might it help a little? (Chris_B, or other experienced track drivers)

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AP - Chris_B

Road America is pretty killer on brakes, right?!

Stainless steel shims do provide a small amount of heat insulation, but not much as they are thin. I've seen titanium used for the same reason. While Ti can be better (depending on which stainless steel alloy it is being compared to), a .020-.030" thick shim is just not thick enough to make a huge improvement.

Some professional racing pads, like the Mintex F3R, have been specifically developed to reduce heat transfer. The current version is a 35% improvement over the early compound. Shims are in typically the 2-4% range, which pales in comparison.

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Chris Bernal
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