for managing the driving force transferred to second flywheel 21 is installed on driving shaft 22 between first and second flywheels 20 and 21 the simulator according to one embodiment of the present invention includes a braking system 38 which generates a pressure equivalent to pressure by a driver 39 s stepping on a brake pedal induces a braking force in response to the pressure and transmits the braking force to pair of wheels 16 and 17 the braking system 38 is further provided with a first pneumatic cylinder 12 and a master cylinder 13 a reference numeral 11 denotes an abs modulator to be tested abs modulator 11 is installed between master cylinder 13 of braking system 38 in a vehicle and a wheel cylinder not shown attached to pair of wheels 16 and 17 to regulate an hydraulic pressure supplied to braking system 38 a manual braking is performed by directly driving a piston of master cylinder 13 by means of first pneumatic cylinder 12 a pneumatic pressure generated by a pneumatic circuit 40 illustrated in fig3 is partially supplied to first pneumatic cylinder 12 by this pneumatic pressure the hydraulic pressure to be supplied to braking system 38 is generated from master cylinder 13 the pneumatic pressure is equivalent to the pressure obtained by the driver 39 s stepping on the brake pedal the other pneumatic pressure.