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, Mopar 2" lift w/Fox shox, RE Geo brackets, Teraflex monster front track bar, 285-70-17 Duratracs on 17x8.5 Level 8 Punch wheels. RBZ and PRS+, Bestop High Rock rack, High Access front bumper, Soft doors and a Trektop pro, Smittybilt Gen2 comp winch, Cobra 75WX.
2015 Jeep Renegade Trailhawk