What has happened to my brakes?

[macman]

Hoping someone here can help me out and shed some light on this for me.

The brakes went downhill on the TS50 (AU1) after I'd let it "stand" for a week. The brakes work, but have no bite to them. Apply the brakes and it's more like you've pulled the handbrake on if that makes sense. They don't clamp on, they don't wipe off the speed at the last few moments of braking as you would expect. Just a gradual slow down, though jump on the brakes with two feet and you CAN stop.

I've checked the booster which seems to be functioning correctly. I then made the assumption the brake pads were probably shot. On closer inspection the pads were practically brand new Bendix with plenty of meat on them.

I've roughed up the brake pads with a piece of very coarse sand paper, to give them a rough finish again and roughed up the discs as both seemed to be very smooth and glazed.

Brakes are slightly better, however still not acceptable IMO.

Brake fluid is at correct level, and although it appears darker/muckier than you would want (possibly not been changed for a long time) but doesn't stand out as a problem.

Anyone got any ideas as to what might be going on?