Skier130 Posted January 18, 2008 Share Posted January 18, 2008 Here\'s what\'s happening. Aircraft with hyd pressure applied by aux pump. Parking brake released, normal brakes selected, anti skid on and foot pedals depressed to hold brakes, The left forward anti skid valve will occasionally release brake pressure on the left forward brake dropping pressure to zero and then restores it back to 1800 psi. The other brakes drop just slightly. The control box, left anti skid control valve and the left forward transducer have all been replaced, having no affect. Wiring has all been shook down and visually checked. Aircraft had been flying fine days prior, came back with a brakes dragging write up, hyd shop bled brakes, ran follow on maint per tech data, signed it off. Went to fly aircraft, while on spot running to depart jumped forward. All checks above have been done with aux pump no engines running. The left forward brake releases, However if the parking brake is set, anti skid turned off or emergency brakes selected,,, it does not happen. I have printed out the Lockheed Service News for the Anti skid system, which has been no help. Looking for any input... Quote Link to comment Share on other sites More sharing options...
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