ebrake stuck

So yesterday, I had the P5 up on jackstands to rotate the tires (severe wear on the inside of the front tires, so I guess toe is out, but that's a different issue), and I noticed that the driver-side rear wheel still rotates freely when the parking brake lever is fully deployed. Common problems...

I did some searching and wasnt really able to find anything helpful and was hoping someone here could help out. A few days ago my friend replaced my caliper on my passenger side front. Afterwards whenever i brake it causes my ebrake lgiht to come on and stay on until ive driven for a minute...