I have a 1992 Ford explorer, and sometimes it pulls left in varying degrees of intensity when braking. It is non abs upfront, but does have abs in the back. It just happens sometimes, when i get more into the brakes it is usually more pronounced, but 80% of the time it is normal balance, then 20% this pull occurs. Very strange. It could also be the rear drums needing adjustment, but even after revering and stopping several times the problem was still there. We bled the brakes. Checked pads in front and they are about equal. Could it be suspension geometry issues (the car drives straight)? I think it is most likely a stuck piston of sorts though. The left front wheel locks up way before the right front when this happens. Thanks guys.