[vlxjim]

Ya the bypass solenoid is standard on all disk brakes. With drum brakes they slip more at low speed so you don't need the bypass as much. One more trick when backing up a hill or over a bump is to let your rig roll forward a little as you put it in reverse. That allows the tongue to be pulled out so that when the bypass kicks in you aren't locking the brakes closed. This helps a lot if your backing up a driveway.

I pull a Malibu VLX 21" 4800 lbs with a tandem trailer with large vented disk brakes.