Vehicle Two Brake

I want to use 2 Brake in Vehicle.
I want to make two different HandBrake, or add Index to HandBrake so that HandBrake applies only to some Wheel depending on index value. But when I look at the custom engine, I can not tell when Brake will affect the Wheel on the VehicleComponent. Do you know how to make two Brake?
I will wait for your answer.

Thank you