The latest version of the "Indy" Caliper is modified quite a bit. The original caliper had piston boots, the new ones do not. In discussions with the Brembo Engineer it was determined that the dust boots were more trouble then they were worth. My original intent was to rebuild the calipers on John's car, but they did not have replacement boots.
When the engineer explained the redesign to me, it made sense. The pistons now have a steel insert that includes a set of holes around the perimeter of the insert, near the brake pad contact point. The steel insert isolates the heat from the fluid, and with the vent holes, air passes directly through the insert to cool it.
I was actually quite surprised when I recieved these and opened them. They are really optimized for racing use. The Brembo engineer also mentioned that if used on the street, or ocassional tracking, you just need to keep up your brake fluid changes, since the reason for the dust boot was to keep brake dust from passing through the inner seal and into the fluid.
That is what I learned from the engineer at Race Technologies.
Regards,
LarryB