Front Brakes Sticking

I have a 2003 Tacoma 4x4 Ex. Cab. Pulled into a service station in September to get gas and it cost me over $500 to get it out. The drivers side front wheel would not spin. Replaced wheel bearings on both sides, new axle on drivers side, new rotor on drivers side (warped from the heat) and new caliper. Everything was fine for about two weeks, then it happened again on the passenger side. Replaced the rotor and caliper on the passenger side along with new brake shoes on both sides, two weeks later, same thing. This time I replaced the rubber hoses on both sides. Yesterday, the same thing. Truck would barely move and the brake pedal was extremely hard. Went to Wally World and shopped. Truck sat for about an hour. Went to leave and the pedal went all the way to the floor with very little brakes. Drove it for about 5 minutes and brakes were fine. I am at loss on what to do next. Any help would be greatly appreciated.

 

Seen this many times on several different vehicles. It is usually one of two things, either the master cylinder sticking, or the brake booster binding is binding or the booster adjustment rod nut is loose.

 

Thank you, the master cylinder was is what I was going to replace next. I'll let ya know if that fixes the problem. I have never had this much trouble with a problem.

Thank you,