I've got an odd behavior in my '78 J that's causing a lot of head scratching at the moment. My left brake will gradually start to drag, and eventually lock up when taxiing, especially during long taxis. Even when only using the right brake, the left one will start to drag, and progressively get worse. If you let the plane sit for 1/2 hour, it frees up. My A&P checked the calipers (they were free), and the master cylinder (no sign of problems). I'm very careful not to ride the brakes. With the plane in the hangar I've been able to move the plane freely. Hop in and just tap the brakes, and then the left starts to drag. I'm trying to avoid a shotgun approach to fixing this, but don't have any ideas on what to check next. Any thoughts from the MS crowd?
Tom