Skyhawk 172/Cutlass 172
Flight Crew Private
Flight Crew Last 90 Days 8; Flight Crew Total 125; Flight Crew Type 70
Aircraft Equipment Problem Less Severe; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Flight Crew Regained Aircraft Control
Aircraft; Human Factors; Weather
Upon landing on runway with mild variable winds; VFR weather; touched down within recommended speeds. Brought full back pressure on controls; experienced unilateral braking to R wheel; resulting in aircraft turning in direction of area between runway and taxiway. Additional braking applied to L wheel to attempt to straighten course of aircraft without success. Aircraft proceeded to enter gravel ditch between runway and taxiway. Back pressure continuously applied to maintain nose-up position throughout incident so as to avoid prop strike. Aircraft brought to complete stop in gravel area prior to entry onto taxi-way; no runway/taxiway incursion.
The Pilot of a C172 experienced asymmetrical braking for unknown reason during landing that resulted in a runway excursion.