Yesterday coming home in the rain I felt they had no stopping power. Had to squeeze really hard and although I could feel them slowing me, they weren't slowing me much. They weren't like that when I went to work in the morning. Wondered if it was contaminant making the disks or pads greazy or maybe glazed pads. So last night I pulled out the pads and cleaned everything and roughed up the pad surfaces. Effectively still no change. I can't see any sign of leak and still have pressure so don't think that is the issue. The fluid looks clean and was changed about a year ago, so it should be fine still. I guess air in the line could explain the feel I get but can't see how that could happen during the day. Anyone got any ideas. I always felt my brakes could use more stopping power and was already thinking about getting some braided lines so my solution is to just take it off to the mechanic and getting them checked out as part of a general brake overhaul. But just curious what the hell will cause brake performance to deteriorate so fast.