I have a Harley Volusia with just over 1050 miles on it. The rear brake peddle has always been stiff and at the top. The other day I went to ride it and the peddle went all the way to the bottom. They do not pump up. The reservoir is full. I do hear what sounds like fluid being pushed when I push the peddle down. Is there a metering valve or pressure relief valve that could be letting the fluid by pass? The rear brakes have always been hard to press and don't stop as well as I would expect. The conversion was done in 2017. Thanks for any help!