I set up my brake system with (2) 10psi residual valve 1 front 1 rear! Worked great for a short while.... Put about 150 or so miles on it and now I have to pump the pedal to get the brakes up. I've narrowed it down to the front. Going to assume the residual valve took a poo.... I'm using speedway brand valves. Anyone have any preference on a more reliable brand? These little guys are 35$ each and I don't want to have to replace them every 150 miles. Thanks! All input is appreciated!