Parking brake adjustment..

I recently downloaded a great 757 for FS2002. However when I sit on the runway with the throttle at idle and the parking brake on, the aircraft "creeps" at .1Kts. As if my brakes are not holding the aircraft.
Where can I adjust the brakes in the AIR or GFG file? What should the braking strength be for a 757?
Also how about the effectivness of the spoilers? I feel they are not decelerating the aircraft enough when deployed.
Thanks for your help
Where can I adjust the brakes in the AIR or GFG file? What should the braking strength be for a 757?
Also how about the effectivness of the spoilers? I feel they are not decelerating the aircraft enough when deployed.
Thanks for your help