Hi jgoodloe. Welcome to the forum. Bleeding isn't the issue. Air in the lines will cause poor brake application. It won't cause them to stick or lock up. Start by opening a bleeder screw at one of the wheels. If that brake releases, close the bleeder, and reapply the brakes to get it to lock up again, then crack open the steel line at the master cylinder. If the brake releases again, suspect brake fluid contamination. Proof will be seen by looking at the rubber bladder seal under the reservoir cap. If that seal blows up, is mushy, and is difficult to push back into the cap, the fluid has been contaminated with petroleum product. That will cause the lip seals in the master cylinder to grow and expand past the return ports. That prevents fluid from returning from the calipers and wheel cylinders.
If opening the bleeder does not release the stuck brake, it is likely you just have sticking pistons in the calipers or the caliper slides are rusted or impacted with mud. Ford products that use the rubber wedges to hold the calipers in place have a real lot of trouble with sticking calipers, but that won't affect the rear brakes. Clean those slides on the calipers with a file and use high-temperature brake grease on them. If the pistons are sticking, replace the calipers. We used to rebuild them at every brake job, but today professionally rebuilt calipers are very inexpensive.
Thursday, June 24th, 2010 AT 3:21 PM