The dust boot stops debris from getting between the piston and the caliper.

As long as the temperature of your brakes can reach 400 degrees those things are going to disintegrate.

You really don't need them but just make sure to clean out your calipers with some brushes and brake cleaner once awhile (like after track days)

Behind the dust boot and what is actually important is the piston seal ring.

I usually put new boots in when I service the Pistons but I just let them blow out and stay there till the next service time


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Any car I have tracked with dust boots have melted. My Wilwoods do not have any dust boots at all, which should make rebuilding easier. That was always the hardest part when I rebuilt dust-booted calipers, trying to force the boot in and keep it in while you're pushing the piston in.

 

Yep, even my stop tech st40 dust boots finally started to disintegrate. I just ripped em all off. Dust boots are for road cars. Race calipers don't normally have these boots.