A controller in a first vehicle includes an electrical input port adapted to receive a first electrical signal, based on a presence of a first service brake demand associated with a first brake valve on the first vehicle, and a second electrical signal, based on a presence of a second service brake demand associated with a second brake valve on the first vehicle. The controller is capable of determining if at least one of the first electrical signal and the second electrical signal indicates the respective presence of the first service brake demand and the second service brake demand. An electrical output port is adapted to transmit an electrical deceleration signal based on the presence of the at least one of the first service brake demand and the second service brake demand. A speed reducing mechanism on a second vehicle is applied based on the electrical deceleration signal.