Brake light comes on when backing out of driveway, brakes squeal like the emergency brake is on, but light goes off and brakes act normal after putting into drive. Took to a tire, brake place and they could not find a cause.

so, when it is particularly humid (which it is often in Missouri) as I back out of the driveway, the emergency brake light comes on and it acts like the brake is set by slowing the van down and squeaking. as soon as I stop and put it into drive to go, the sounds stop and the light goes off. I never set my emergency brake in the garage.