Have inspected brake fluid reservoir (no front/rear compartments) and it is full of fluid and there are no signs of leakage visible.

With engine idling I did pump the pedal rapidly and felt a build up of pedal feel before the engine revs dropped to the point of stalling the car. Throttling up to just above 2,000 rpm, I was unable to get any sort of pedal feel from pumping the brake pedal, however when i dropped back to idle, I was able to "tease" the revs down to just over the stalling point by pumping the brake pedal, at which point there was some resistance felt.

Any other troubleshooting tips would be gratefully accepted.