Could also be your rear shock leaking. These are known to have issues. I doubt it's the brake fluid, but check anyway. You'd lost your brakes by now. Another source of oil is the differential. The seal may not be holding the oil in and it is leaking through the bearings, making ...
1. Lift the hood of the car and locate the brake master cylinder's fluid reservoir. Clean the top of the brake master cylinder using a shop towel then loosen and remove the lid.2. If the fluid level is low add brake fluid from a sealed container until the level reaches the fill line...