I need some help fellas. so I only run one brake upfront. I don’t know if that has anything to do with it so I just wanna throw that out there. I bought a brand new Kawasaki OEM master cylinder rebuild kit. Everything came with it brand new not just the seals, the whole pistons and everything I tore the front brake caliper, completely apart, cleaned out all the ports all the holes wiped all the pistons off made sure they were smooth put everything back together.also I have core Moto lines. brand new DOT4 brake fluid. now the problem I’m having is my brake lever handle gets extremely hard to pull in and start breaking. All the return ports have been sprayed out everything’s new. What else could be the problem or is that just how it’s gonna be using one caliper. I use one caliper because it’s 1/8 mile track bike only. Trailered to and from only no street riding.