Girodisc Porsche 991 S, 4S, GTS Front Caliper Rebuild KitOne kit per caliper. Been to a few too many track days? Didn't have our titanium pad shields behind your pads? Now your seals are cooked but we can help. These high quality dust boots and piston seals are made to our specifications and will get your caliper working like new again. One kit has enough dust boots and piston seals to rebuild one caliper. We recommend pairing freshly rebuilt calipers with our titanium pad shields to extend service