I'm having an issue with my rear brake. I took a 30 minute ride last night on the freeway, consistent 65 mph, and when I got off the freeway I noticed my brake pedal was very stiff and my rear brake was slightly applied. These are the stock style hydraulic drum brakes. About a year ago I replaced the shoes, wheel cylinder and master cylinder. When I got back on the bike several hours later the brake had loosened up and was back to normal but it was stiff again one I got home. Any Ideas on what could cause this? I wasnt doing any braking on the ride there or back except from when I got off the freeway.