Originally Posted By Supercuda
I'm sure he meant phenolic not plastic.

.......

Phenolic pistons don't transfer heat to the brake fluid like steel.

But high heat can cause the phenolic material to break down over time due to oxidation.


The bold above, is also IMO a significant cause of why they overheat in the first place, they can't depend on the fluid as heat path to help cool themselves. SS types seems to be best compromise.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.