On our vehicles I can shut off the automatic headlight system by barely setting the parking brake, not enough to engage the brakes, but just to the first click on the pedal. But I don't think that's a good solution for the problem you're dealing with. Something is messed up in the wiring of your toad brake/turn signal system.
Steve & Nancy
2005 Itasca Sunrise 33', W20 Chassis, Ultrapower, Henderson Trac Bar
2012 Chevy Captiva Sport AWD, ReadyBrute Elite Tow Bar, Blue Ox Base Plate, Protect-A-Tow