Encountering occasional loss of braking when loader brakes have been applied for a period of time. This is a sudden loss of braking with the loader starting to move unexpectedly. The air pressure gauge shows adequate pressure yet the brakes do not respond if the pedal is pumped once. If you have any ideas, they would be appreciated. Both master cylinders have the correct level of brake fluid and the brakes work in a normal manner under regular operation. This failure only seems to occur when the loader is being held in a stationary position for a period of time ( say 3 minutes or longer).
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