Caging the Parking Brakes
Warning: Do not operate the vehicle with the front brakes backed off or disconnected. Backing off or disconnecting the front brakes will not improve vehicle handling and may lead to loss of vehicle control, resulting in property damage or personal injury.
Before driving the vehicle, secure all loose items in the vehicle so that they will not fly forward during a full brake application.
Notice: Do not continually press down on the parking brake control valve (yellow knob) without pressing down on the service brake pedal. This will damage the safety interlock.
The service brakes and parking brakes have a safety interlock that prevents the unintentional release of the parking brake. These instructions need to be followed for the appropriately equipped vehicle to release the parking brake interlock.
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.
There are two ways to do this:
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Apply an external air source at the gladhands;
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Cage (manually release) 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.