On my old '72 vette the bores on the brake calipers were prone to getting pitted leading to leaks around the edges of the piston. With 245k miles on mine and brakes needing attention I'm contemplating a set of rebuilt calipers (Pep Boys, etc). On the vette I had stainless steel sleeves installed in the caliper - is pitting an issue with the OEM? Can you just get a set of pistons and O-rings and rebuild them? I've read about the Tundra Upgrade - unless its a bolt-on I'll pass....