Slideout extended while driving?

Kalsbeek,you were right! I turned the motor break levers as you suggested and the slide's recessed levers now crimp the stationary sides. I was surprised how little the motor break levers moved - just a smidgen. The first time I pulled the slide in the recessed levers didn't move, but I then pushed the "retract" button again and they closed. The second time the slide retracted they work normally.

Thanks to you and the others who responded to my post. This website is great.