Brake fluid today, while I've got the calipers off and easy access to everything. Obviously this is the worst I've ever seen
Its almost black. I dread to think when this was changed last.
This is after pushing a litre of new fluid through
After about 2 litres the front right is running through clean. The front left took another half litre or so to clear up. I still have the rears and the ESP pump to do when the drivetrain is back together (and there's power to run the pump), but this has got the worst of it out.