Don't know what is happening

:
2003 Mazda Protege5 2.0L Automatic
Hey so while driving my car will almost brake without me hitting the pedal so I have no idea what is wrong. If you have any ideas please help me out!
 
Easiest check is the rear piston adjustment screws. Takes you 5 minutes and you can then rule them out if they're not causing the pads to drag.
 
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