Hydraulics on m9540 loader tractor suddenly became slow and jerky, first symptom was the left brake pedal becoming very soft, shortly after all the hydraulics became very slow and jerky. The hydraulic shuttle also is very delayed to move the tractor, i topped off the fluid and raised and lowered the loader several times to bleed the air because i initially thought it was low on fluid. now nothing has changed. I am hoping it is something simple and not the pump. any advice would be great. thanks