Abstract: A brake rudder pedal system for a light aircraft is disclosed including a pair of pedal bodies whose tops are rotatably supported between hull frames; rudder and steering operation members being rotatably connected to the pedal bodies thereoutside, the member having upper first arms connected to a rudder operating flexible cable and to moving-left-and-right flexible cable, and lower second arms connected to the steering mechanism by a steering rod; brake operating member having a brake pedal whose lower portion is rotatably supported to the pedal bodies, and a brake lever connected to a brake pedal and for operating a brake mechanism; and pedal position controller member having a control handle rotatably disposed on a gauge board cover, a pair of transmission flexible cables rotated while connected to the control handle, a control nut supported to said pedal bodies to be movable forward and rearward, a support block supported to the connection arm to be movable forward and rearward, and a control screw rod su