Front Brakes Locking On After Car Idles.

We got car out this spring, removed m/c from booster, jacked both front wheels off ground on stands and started car. Within fifteen minutes the front wheels started to get hard to turn without ever touching the brake pedal with car idling. Eventually wheels would not turn by hand. This led me to believe fluid was getting heated by exhaust and expanding, which led me to relocate distribution block up next to m/c. I was curious before discovering this that the m/c seemed to be leaking out the lid and m/c was new. I guess I didn't put 2+2 together. Anyway, once again to everyone who posted suggestions and maybe this post might help others who come up against this.
it's great you posted the final resolution. Often times we never hear the real answer to the question.