c/k 2500 chevy

Replaced multifunction switch due to hazard button sticking. Now the rear brake lights stay on all the time. Replaced brake switch no change. only way to get brake lights to shut off is to pull the 20 amp fuse???

Need more info on vehicle. Such as what year? What model? Is it a C or a K?

Thanks but I figured it out. Bad switch I got from parts store.