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The brake treadle valve (foot pedal) can get dirt in it, leak out that vent you describe up under the center grill, and dump air to zero. There's a thread on that problem. I will try to fine it unless someone beats me to it. Edit:. This thread is good...

Found the source of a couple more air leaks that I'll describe here. Look at TM 9-2320-365-34-1, Figure FO-2 pneumatic system schematic. Air was leaking from the front emergency gladhand. The nearest component in line behind the gladhand is a one-way valve. To get to it, must remove front...

Copied from another thread to consolidate information: Haven't found info on a rebuild kit for Wabco 461-315-161-0 treadle valve yet. Several local auto parts places and a big truck repair place don't find reference to any kit. The big-trucks guy speculated the treadle valve is critical enough...