How does the air brake system works Part 4 of 4

[@shamraizwarraich4278]

Amazing thanks a lot........

[@TechandCars123]

Most welcome! So nice of you!

[@5minuteprojectideas]

Well done. Keep it up!

[@TechandCars123]

Thanks, will do!

[@HenoggietahunHenoggietahun]

God job bro i admire you

[@TechandCars123]

Thanks a lot for your kind words!

[@pregaramen8747]

Please explained if both the tractor and the trailer stop at the same time.... should the trailer is fully loaded.