Scotty I have a 2004 Ford escape xlt six cyclinder. More often than not here lately when I turn on the AC and am driving in stop and go traffic downtown the brakes will start tighten up and slightly shut down. I can drive but I can feel the engine in a strain and smell brake shoes

check for dragging brake callipers or sticking master cylinder first

Master cyclinder has been replaced. When the AC is off they work fine. But when I turn it on it starts tighten up

How do you check for dragging calipers