Hi my bike has nissin brake calipers. The pads have 12,000 miles on and are still have plenty of life left in them (not down to the indicator yet).
Now the rear brake always feels spongy, rubbish and pointless, it doesn't really grip all that well in the warm dry weather(I can still move the bike with full rear brake applied).
Now then today it was raining pretty good and the rear brake felt the best it has done in a long time. The sponginess was gone, instant grip and effective like a brand new bike.
What could cause this situation?any ideas?