My central locking pump has been sounding like it was slowly dying a death for quite some time now. It would moan and groan on every time I would unlock the car, only unlocking, locking was fine. I checked over the full system looking for leaks and found none, all was good so checked the pump itself. With my finger over the outlet the pump would still run on and on, so the pump itself wasnt making a good seal somewhere. Took it to bits and there are 4 little pieces of plastic or carbon or whatever that sit in grooves inside the centre of the pump, which the chamber is egg shaped and these pi