4 Piston Caliper rebuild kit for 05-06 Ram SRT 10 calipers. Kit is complete with 4 new pistons and 4 new seals, each kit is enough to do one caliper, to do 2 calipers you will need 2 kits. We do highly suggest you completely flush the brake system with new fluid. We suggest the wilwood 570 brake fluid, you would need 4 pints to flush the system.