Originally Posted by Biker Biggles

I reckon it is slightly binding brakes.Possibly due to dirty pistons,but did I understand correctly that it only does it when you push the bike forwards and not when you reverse it?That could be due to a wear pattern of the pads.If they wear slightly "off square"then you get an angled pad against the disc.This can cause extra resistance.I've only ever seen this the other way round though,such that the brake binds heavily when pushing the bike backwards.