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That's a possibility. When you push in the Valve does it sound like a full charge of air is coming out of the hose? You do know you have to push in both the SERVICE and EMERGENCY valves to charge the system correctly right? Are you sure you hooked up the hoses correctly? Someone may have...

On a straight air brake system when there is no air on the trailer the brakes will stay locked until enough air is put in the system to release them. On a air over hydraulic system the brakes will not lock up when there is no air in the system (we always double chocked the older trailers if they...