Real race car:
When hydraulic pressure is built up, the brake pads are squeezing the discs hard and all mechanical play is compensated. In this stage, your foot is basically pressing against a wall, because now your muscles are pressing directly against the hydraulic forces (the brake fluid). Since the fluid cannot be compressed, you will feel the pedal is hard.
When a racecar driver complains about a “long” or a “soft” pedal, it is typically because there is air in the system, and since air CAN be compressed, the pedal will feel soft and long. The mechanics then bleed the brakes for air, meaning there is only fluid left in the system, and the pedal is once again hard after passing the “soft stage”.
T.H.O.R.P. System:
When the slave system is mechanically locked, you have 100% the same feeling as in a racecar, when the brake pads are fully pressed against the brake disc, and your muscles are pressing directly against the hydraulic forces.
This is NOT simulated, this is the same and identical feeling as in a racecar, and you can keep pressing the pedal up to a hydraulic pressure of 100 bar, which corresponds to 185 kg of pressure on the pedal plate – the same as a real F1 car!