Parking Brake Pushing Back?

I pressure washed my truck, and I must've pissed my e-brake off because after the wash, because it pushes back. After the wash, I went over to the store and parked it and turned it off for maybe 20 minutes. When I got back in the truck, I started it as usual and I went to go push in the e-brake, and it pushed back. After a wrestling with it, I got it to release, but it was pushed out just far enough to where the e-brake light was on.

I drove it for a while and pushed on it so the e-brake light wasn't on. And when I got home, it functioned like it normally does.

Is this just the e-brake acting up or is this a symptom of something worse or what? It's never happened before.

 

probably just some dust got somewhere it shouldnt. go back and lube up all the joints.