Pneudraulics
Airman 1st Class Conner Tolley, 28th Maintenance Squadron hydraulics technician, loosens brake housing pistons during disassembly at Ellsworth Air Force Base, S.D., May 11, 2012. When any problems occur with B-1 brake systems, they are disassembled, inspected, fixed, reassembled and extensively tested before being reinstalled. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)