Skyhawk 172/Cutlass 172
Flight Crew Flight Instructor; Flight Crew Commercial; Flight Crew Instrument
Aircraft Equipment Problem Less Severe; Conflict Ground Conflict; Less Severe; Ground Event / Encounter Loss Of Aircraft Control
Flight Crew Returned To Gate; Flight Crew Took Evasive Action; General Maintenance Action
Aircraft
During today's dual flight; we tested the brakes and taxied to 14 via C; A to do run up and depart south west. When we reached 14; we taxied to C to do run up while other aircraft was holding short 14 at A. While moving forward; we lost left brake pressure on both side. The aircraft was close to grass; so we started using the right brake pressure to prevent entering on the grass; but the aircraft started yawing to the right moving closer to the aircraft on hold short; creating collision hazard. We managed to stop the plane and taxied back to ramp safely and squawked it.
C172 Flight Instructor reported brake failure during taxi.