UPDATE
I popped open my hood today after spending 5 hrs cutting the grass. I first looked into the air cleaner for signs of little critters and saw NONE. It was as clean as when GM put it together. I searched the rest of the engine campartment, in the quarter panels, under the frame, firewall, and rear underneath of the car but ABSOLUTLY NO SIGNS OF CHEWED WIRES. No wheel cylinder, or master cylinder leakage. Nothing looked out of the ordinary in any place I looked.
I also (with a flashlight and mirror) checked on the parking brake mechanisum. What I think is the switch, located at the top, white nylon with a brown srtiped wire coming off of it, That looked OK. I tried to wiggle this wire and switch to see if it was loose but it was not. Giggiling the wire had no effect on the illuminated indicator dash light.
The car moves and stops normaly. No pulling to either side.
I'm at a loss what to try next other than take it to a dealer or garage for whats causing this.
