Guidance summary
Do not move with unsafe brake-air pressure
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Before travel, check pressure build-up, warning operation, leaks and both tractor and trailer service brakes. Keep the parking brake applied until working pressure is safe. If a low-pressure warning develops during travel, stop safely, report it and have the dangerous fault rectified before continuing. Revving or pumping the pedal is not a repair.
Source: Do not move with unsafe brake-air pressure
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