While #1,and#2 eng running utility sys press, Brake press, and rudder booster pressure is 2800 psi but when the control stick moves extreme forward perss drops to 2000 psi and remain same but when control stick puts back it is normal.....when elevator booster shutoff switch puts off the press indicated normal....no hydraulic leakage found from the system.
we alrady cleaned and replace the hyd filters.
please give me some suggestions on this regurd....