On the P-Series chassis, the footbrake was supposed to be only an actuator and nothing else. When depressed, it would indicate that you could now deploy the leveling system. The actual brake cable would not do anything and when the coach was put into "park" the auto-brake would apply around the axle.
If your foot pedal brake is actually attached to the brakes, I would be surprised.
I had my p-series chassis (1996 Southwind) for 16 years and never had an actual foot brake.