As far as I can tell to test servo, foot on brake and then turn on engine, pedal should sink slightly which mine does, any other way to test it? All corners were bled and the fluid did look a little misty and dark. Bleeding seemed to improve it slightly but it has quickly gone back to the no bite feel, really have to bury my foot to get any stopping power. Any chance some air is getting in somewhere? But if that were the case I would expect to see some fluid loss too which there isnt. Pads have been barely touched, loads of meat still on them. I have no idea what brand they are as it was done by previous owner. Can pad choice really make such a huge difference?