I press the 4 LSGI Buttons on the (LSGI) LOW SPEED GROUND IDLE CONTROL PANEL - See page 24 of the ‘C-130 X-PERIENCE’ FLIGHT MANUAL Part II –Systems and Equipment (csc130_manual2.pdf) for information on what they do/how they work. ;)

Note. The brakes sort of work, but once the LC-130 starts moving they don't work any more. However. Using the LC-130 in another company's Antarctica X scenery is much better than using it in the default FSX/SE/P3D Antarctica scenery. ;)