mine seems to do that too! Im not sure, but I think its normal with anything thats hydraulic. (correct me if im wrong) But both of my brakes will do soften, not to the handlebar, or maxed out, but will, soften half what they are fully pumped up. My front brakes are BRAND new, and my baks are a few months old. After I use them, or pull them in a little bit 1ce or 2wice when im riding, they will pull firm. then after, if I dont use them for a while, the same thing happens.
IMO, its normal with hydraulic brakes to do it a Little bit, but Im not sure about all the way to the bar/maxed pushed or pulled.
Someone please help BOTH of us out.
Thanks.