I'm having an issue with just one of my brakes being applied, and then releases all on its own. I have an 86 extra cab. I've already replaced brake pads, the caliper twice, the soft hose going to the caliper, and the master cylinder. Any insight would be greatly appreciated. Also, it doesn't always do this. It's very spuradic. Curvy road, straight road, with or without bumps. It doesn't matter, sometimes it does it and sometimes it doesn't. But when it does, it causes me to look like I'm racing from a stop, just to be able to shift.