S6Raptor

I've had an issue since I put new calipers on the rear where the parking brake wont release. I've figured out that the springs that release the brake on the caliper don't seem to have enough spring pressure to disengage the brake. Anyone have a part number for the proper springs? There also seems to be a little bit of excess friction in the arms that control the parking brake, where the springs attach. anyone know a way to loosen them up?