You can use brake cleaner on anything in the brake system. Even brake pads and shoes. It is "self emulsifying". That means it evaporates without a trace. I use it to rebuild master cylinders, calipers, wheel cylinders......literally everything in the brake system. I have even used it to clean the guts of an ABS ECM, because it is the same as electrical parts cleaner. It works good for all kinda stuff.