Brake Pressure Won't Build

[NfiniteMile]

Just Replaced My Air Brake Tank Due To An Air Leak And Now My Brake Pressure Won't Build With The New Tank.

1984 International S1753

I Know There's Air Going To The Tank Because After I Installed It, There Was A Leak At One Of The Fittings But I Corrected The Issue.

[Rwnielsen]

Sounds to me like you left a port open somewhere. Can you safely get under it when it's running and feel around the lines? If the leak is big enough you probably won't hear it over the engine. Just a hunch...