My '99 Cobra has a perplexing problem, in that the brakes engage when they shouldn't.

Can feel the calipers gripping when starting off in 1st gear, & can feel them grabbing as
I'm driving down the road. Brake pedal feels very stiff & "grainy".

This is intermittent, seems to begin to happen 20-30 min after start-up & leaving garage.
May or may not continue or it may just start braking normally.

My usual shop here (1), and then the Ford dealer (2) have been unable to
diagnose or correct this problem.