Ya know Chuck sitting static with the emergency brake applied to have the brake tanks stay up for a month is very very good.

However the real test would be wheel chocks in place emergency brake released and a weighted object on the brake pedal. I think if u did this u should see the same results or something is leaking. In this configuration u r supplying air to the emergency diaphragms and the service diaphrams both.

This is a test everyone should do at the end of every day.