Hello, I will renew the topic. I have a MAN F2000, VIN WMAT32ZZZYM289573. There is the same problem with the air, but a bit in the opposite direction, air is escaping from the main foot valve when the handbrake is applied. I followed the diagram and on the G7 foot valve I unscrewed the line from socket 21 and air comes out of the line when the handbrake is applied. This wire goes to G16/G54 but I can't work out what the valve is. If the manual is released, everything is ok, I am ruling out the actuators. Please help, thank you in advance.
Added after 4 [hours] 9 [minutes]:
Fault cleared , my fault was that I looked at the wrong plan , I did not see the trailer control valve G17.201 on it , it was the cause , thank you and sorry for the trouble.