How to make egoCar to stop/ brake.

All,

I am creating a simple driving scenario of a egoCar moving straight at a constant velocity. There is a singular actor, a pedestrian (MALE), who will be walking across the egoCar's street also at a constant velocity. I have the scenario, sensors, and waypoints all created in the Driving Simulation Designer as shown before.

How would I go about on making the egoCar stop or brake when it detects the pedestrian crossing? I have chekced out with AEB example Matlab has provided, but when I try and run the simulation following their directions I recieve parameter erros.