Maintaining optimum pedal feel and consistency of a high performance or racing brake system is a direct result of the average and peak temperatures the brake caliper components (brake fluid, seals, pistons) are subjected to. Typically, brake discs and friction materials do the bulk of the temperature management in a Motorsport brake system, however a lot of the radiant heat is transferred into the caliper body as well. As the radiant heat has been transferred to the brake caliper - the fluid and piston seals must be cooled and an optimum running temperature must be maintained. If the caliper seals are subjected to severe demand and the proper temperatures are not maintained, the pedal feel will be directly affected, resulting in a partial or complete loss of braking power.
The demand that the caliper components are subjected to really depends on many variables, some of them are - individual application, track layout, friction material, disc thermal capacity, caliper’s fluid volume, etc.