In 2007 after driving home from the 1st. Dragon, I drove my car hard and put it away wet...literally. In the spring I pulled it out of the garage, and the emergency cable froze up on me after sitting for 5 months.
I'd take a close look at the emergency brake shoe sticking. Since they're on the back, one brake shoe could be froze and it still wouldn't necessarily feel as though it's pulling in one direction or the other.
I had Rotex Gold pads installed on all four brakes when it turned up 30k miles, and the dealer "turned" all four rotors at that time. My car now has 45k on it with 2 Dragon runs under its belt and the brakes still feel fine, with no ill effects what so ever.