Super King Air 300
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Flight Instructor
Flight Crew Last 90 Days 40; Flight Crew Total 3600; Flight Crew Type 50
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Object; Ground Excursion Runway; Inflight Event / Encounter Weather / Turbulence
General None Reported / Taken
Aircraft
Just touched down on ZZZ RWY 25 with a stiff left crosswind. I applied my brakes to slow down to exit at Taxiway A5. I discovered that the left brake and nose wheel steering were inoperative. The aircraft drifted further right due the crosswind and functional braking on the right side. I was unable to straighten the aircraft. I called for my copilot to assist in braking and steering. He attempted to brake and steer; but reported that the left brake was 'flat' We were unable to maintain directional control of the aircraft. The aircraft exited the right side of the runway striking the A5 taxiway sign and a runway light. We shutdown the engines; secured the airplane and informed the tower.
BE300 Captain reported losing the left brake and nosewheel steering on landing roll causing a loss of directional control. Aircraft departed the runway and struck a runway light and taxiway sign.