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You may have to bleed the brakes and put fresh brake fluid in the systems. When you squeeze the brake lever or mash down on the rear brake pedal the fluid is pushed into the calipers and that moves the pads onto the disc/rotor. The friction between the pads and the disc/rotor creates heat. That heat is transferred back into the brake fluid. The fluid can get so hot it boils and burns turning dark in color instead of the clear liquid it once was. Just like when you burn something you are cooking on the stove, that black residue stays in your brake lines and can clog things up. You should replace your brake fluid at least once a year. On my old race bikes I would change the fluid after just a couple of races. It heats up and cooks the fluid quickly when you're late braking into corners hard on the binders lap after lap. Street riding isn't that bad but if traffic is heavy on your commute you can put a lot of stress on the brake fluid. Try flushing out the old fluid with new...
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