Okay I'll start by setting up the aircraft:
-Power on
-Both emergency and normal brakes powered to 3000 psi (all is good)
-9-port handle is in the down position (powering all systems with aux pump)
Snag
-Turn off aux pump and normal pressure begins to deplete to 2700ish psi while emergency stays at 3000
-Select emergency brakes and start pumping to release hydraulic pressure
-Emergency pressure depletes, but so does the Normal at almost the same rate (this isn’t good lol)
-If you power up both systems again, kill aux pump, select Normal Brakes, and start pumping the pedals. Normal brakes deplete as they should and emergency stays solid at 3000 (works as advertised)
We have changed both Normal and Emergency Brake Selector Valves but snag persists. I’m starting to lean towards a faulty Normal Brake pressure return check valve OR the dual brake control valves.
Hope someone has a bit of input here, could really use the help lol. Thank a lot guys! :)