You said it released while towing it on the trailer? So it freewheels now? Does the tractor run? If it does start it up and see if it drives. Sometimes the manual release valves can "leak down" when the tractor is off for a while and will freewheel but work fine under power. If that is the case, the broken flapper will only be an issue next time you need to roll the tractor right after shutting it off and wouldn't require an immediate tear down.
Bill
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