Update to original post
RD2006 is right. Was out readying for a trip and went into the compartment where the slide motor is, IS NOT any sort of mechanical, electro-mechanical braking device visible on motor or reduction gear assembly. Motor is clearly visible, center of slide and has wire harness going in a smooth cylindrical housing with a larger cylindrical gear housing that bolts up to the large reduction gear on the slide mechanism. No switch, lever, or any other locking device here. Guess comments about motor being designed to hold the slide in are correct, or there is some kind of internal electric lock.
Tom and Patty
The "Rode Crew"
2012 Itasca Navion J - Sprinter Chassis.