Sound like a bad brake hose. A piece of the inner lining of the rubber hose can come loose and plug the hose and not let fluid back out of the caliper.
2014 Rubicon, Anvil, 6 speed, Teraflex leveling kit, 285-70-17 Duratracs on 17x8.5 Level 8 Punch wheels. RBZ and PRS+ mod, Bestop High Rock rack and High Access front bumper, Smittybilt Gen2 comp winch, Bestop soft doors, Cobra 75WX.
2015 Jeep Renegade Trailhawk