All brakes sticking

[BMW BMXER]

Everyonce and awhile all 4 of my brakes will stick. Then when I start the car again after the horrible drive it goes away.

Whenever I want to see whats causing the problem its fine. Air in the fluid perhaps?

[BMW BMXER]

Anyone? It is not just ONE caliper. Its all 4... evenly. Very very very evident when you drive the car. Reverse is hell, shifitng is hell.

Snow on the ground and I come to a stop? Forget about it...