The brake system of a hybrid may have multiple components to perform regenerative braking and pedal simulation.
A hybrid vehicle is a different animal than many of us are used to seeing. After all, if the engine of a typical vehicle stalled out at a traffic light, the driver of that vehicle would know something was wrong with it. If that same vehicle still drove with the engine off, then that would mean they were probably going down hill. But in the hybrid world, that is all normal.