A civil crew of three personnel (Permit holder, Roller Compactor operator and Banks man) were performing compaction of new tank foundation using a 10 ton Roller Compactor with air assisted hydraulic brake and clutch. The operator drove the Roller Compactor without ensuring sufficient air built up and lost control of the equipment due to ineffective brake and clutch. The operator jumped out of the equipment in panic before it ran out of the edge of the tank pad area and finally rested on the tank foundation base.