HI
Yes both the brake pedal and accelerator pedals move seperately,
but there linked with a flexible cable/shaft, so once the gear splits on the brake pedal,
it stop the motor turning on the accelerator pedal
some pics below

PIC OF GEARBOX THAT FAILS ON BRAKE PEDAL



PIC OF THE GEAR THAT FAILS



PIC OF GEARBOX IN BITS




PICS OF GEARS IVE MADE BY MAKING A MOLD AND USING RESIN