Brake Master Cylinder problems of the 2009 Dodge Caravan

2009 Dodge grand Caravan (stow and go) extreme heat and strong smell of overheated brakes coming mostly from rear brakes. The heat generated in an average 16 mile drive under normal operating conditions causes enough heat and strong brake smell that you can hardly touch the plastic hubcap mounted on the steel wheels. The emergency brake has never been used and has never been activated accidentally. The smell can be noticed all the way around the vehicle from inside and outside particularly in the rear. I am retired ase certified technician with 45 ase certifications and 50 years in the profession. I would suspect residual valve in master cylinder, sticking calipers, or parking brake components. The rear brake sensors have been touching since 16,000 miles. VIN #[xxx] purchase date 28 Feb 2009. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).