2 PISTONS, CALIPER REBUILD KIT FOR 04 RAM SRT 10 CALIPERS. KIT IS COMPLETE WITH 2 NEW PISTONS AND 2 SEALS, EACH KIT IS ENOUGH TO 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.