Hello, I have a problem with my cab. After both brake calipers were completely fixed in the back I have overtaken the saddles. After I have now aired all 4 saddles, something is not right yet. Air no longer comes. There is a noise from the rear right, where the brake controller is sitting. When the engine is running, there is something going on and it slows down even from the half pedal. Engine off, no noise. Can also build up pressure on the pedal. Thanks for your help.