03-07-2022, 06:03 AM
It almost sounds like the engine driven compressor isn't producing compressed air . Like the unloader valves are activated .
Evidently the system was working previously , you had found a leak at the pop off valve in the Brakemaster?
In your pictures you have a hose with white arrows . That 1/4 hose goes from AD 9 to governor via a tee that also heads to the compressor with a braided hose . The governor controls the unloader valves in the compressor, allowing compressed air on demand .
Your post states no leaks , have you felt at the bottom of the AD 9 with engine running ? Purge valve could be leaking even though it's a new unit.
Evidently the system was working previously , you had found a leak at the pop off valve in the Brakemaster?
In your pictures you have a hose with white arrows . That 1/4 hose goes from AD 9 to governor via a tee that also heads to the compressor with a braided hose . The governor controls the unloader valves in the compressor, allowing compressed air on demand .
Your post states no leaks , have you felt at the bottom of the AD 9 with engine running ? Purge valve could be leaking even though it's a new unit.
1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed
Chris and Sharon Hand