Ted,
The 7-prong RV connector on the back of your coach has the capability of carrying wires for electric brakes, but there is a very low chance that the wiring is already in the connector. The only coaches that have electric brake wiring running through the 7-prong connector are the ones that have been pulling a trailer. Since the vast majority of Beaver owners tow a car 4-wheels down, there is no need for electric brake wiring, so it was never installed.
Gerald