AJW

I have a 21 blazer and the parking brake is starting to engage itself. The 1st couple f times it happened I was parked on a slight hill so I thought it was a safety feature, but now it is happening more often, even when I am not parked on a hill. The first time it happened was about 3 months after I bought it. It does not disengage itself, I have to manually shut it off.