We used Mico brakes on our bobtails many years ago to hold our tank wagons while we pumped off. We also blocked the wheels. Mico Brakes were never meant for long time parking. I have used nothing but air brakes for almost 60 years.

https://photos.app.goo.gl/iJFY56KmAEccXdgE8

I have quite a few old GMC trucks. The ones with air brakes stop. The ones with hydraulic brakes don't and I don't bother to try to fix them.

https://photos.app.goo.gl/EYbsqqe6Z3AMks366