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Don't forget my earlier advice to seek assistance from the local bus operator or a (maybe retired) mechanic.
It's almost impossible to diagnose from afar, but an experienced mechanic should be able to home-in on the fault quickly when faced with the hardware.
Is the footbrake valve jammed in the on position?
Air should only go to the servo when the pedal is pushed, but if it was jammed down the air pressure would never build up . . .
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