V40 – Brake fluid control light – (What causes), Which brake pads

Hello, also with me the brake fluid circuit light now lights up with steeper curves. According to the search, the three causes of decelerated brake pads clutch receivers defective leak in the system So, since the brakes do not pack 100%, and come very late, a replacement of the brake pads/discs would be the first option. However, since apparently also oil comes out somewhere (legitimately staining in the parking lot), it could also be a leak or defect clutch receiver. It’s a V40 1.9 Disel 75Kw from 2001 Do I have to pay attention to something, or can I order a complete set from e.g. ebay? Greetings Leatherface