Caging the Parking Brakes
Warning: Do not drive the vehicle with the parking brakes caged. If the vehicle is driven with the parking brakes caged, there would be no means of stopping the vehicle if a complete loss of air pressure occurred. This could result in serious personal injury or vehicle damage.
To move a vehicle with insufficient system air pressure, it is necessary to release the parking brake springs. Do this by caging (manually releasing) the parking brakes.
Important: Before caging the parking brakes, make the connection to a towing vehicle or chock the tires.
After correcting the brake system problem, uncage the parking brakes before resuming normal vehicle operation.