What is the danger of driving a heavy vehicle through deep mud on an unpaved logging track with mud packed solidly inside the brake drums?

1. Mud and abrasive grit glaze the brake shoes, score the brake drums, cause severe brake drag, and cause catastrophic loss of braking friction
2. Mud inside brake drums makes the diesel fuel freeze
3. Mud creates electrical shorts that disable the tachograph clock
4. Mud makes the headlights shine with blue light