Both front brakes became increasingly engaged & pedal firmly in up position.

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I replaced rotors, upper control arm, pitman arm, idler arm about 1000 miles/6 months ago. Replaced brake master cylinder about 9 mos ago. Replaced power steering hose (turned engine on in process / degreased after replacement). Immediately after degreasing, serpentine squealing warranted replacement of belt, idler & tension pulleys. A day or so after replacing the belt & two pulleys, I noticed idling mph impeded and coasting distance to stop affected. Total of 2 miles driving over the next two days and I brakes were engaged to the point that I chose to drive in 1st gear for the two blocks to my house. Replaced caliper at the suggestion of my auto parts sales/service rep. Brakes were fine for about ten pushes and, then, locked up again. Both sides smoking in the cold air (and smell of overheated pads big time). Frustrated and am praying for some guidance to most logical order / procedure to troubleshoot the source(s) of this problem. Thank you in advance for your consideration.