Hi. New to posting on this site but have referenced it Alot. I have an 05 250 xl club cab (not king) 5.4l. 110k. Brakes have been deteriating. My father Owns a mechanical shop so we fix it ourselves. First we did a new booster and master. After a while still had a problem. Warranted the booster. Stiff pedal. Replaced front calipers hoses and pads. Still no luck. Checked out the rear and drivers side axel seal was leaking covering the entire unit in grease. Fixed seal and went to replace pads an realized that pass side caliper was rusted ( drs rear was replaced at some point (appears)). So. Looking at it I need a third caliper and the peddle is still stiff so I am going to warrantee the master. I'm just venting and hoping that Somone will see this and offer weather I'm on the right track or not or of there is somthing iv overlooked. Thanks in advance. Matt