To check the air brakes on your vehicle, build the air pressure to the governed cut-out with the engine running, shut off the engine, chock the wheels if necessary, then...
Answer: release the tractor protection valve and parking brake.
Answer: release the tractor protection valve and parking brake.
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.