What was found
SHIP 5807 UPON SMOOTH MAIN GEAR TOUCHDOWN, THE AUTO BRAKES AT SETTING 3 AGGRESSIVELY ENGAGED AND CAUSED THE NOSE GEAR TO TOUCHDOWN FIRMLY RESULTING IN ACTIVATION OF DEPLOYMENT OF PAX O2 MASKS. CORRECTIVE ACTION: DAMAGE OR ISSUES NOTED. REINSTALLED PAX O2 MASKS EXCEPT FOR ONES WHERE GENERATORS NEED REPLACING. REF LP 7827410 FOR O2 GEN AND MASK REPLACEMENT. PERFORMED ANTI-SKID/AUTOBRAKE BITE PER B757 FRMFIM 32-42-00-815-802 NO FAULTS NOTED. AUTOBRAKE /ANTI-SKID SYSTEM OPERATED NORMALLY BY AIR/GROUND LOGIC ON MAIN WHEEL TOUCHDOWN AND GREATER THAN 60KNOTS SPEED. ALL OPS NORMAL. REPLACED EMER LIGHT/PAX O2 PANEL (M00043) IAW B757 AMM 33-51 TEST OF EMERGENCY LIGHTS / PASS OXY CONTROL PANEL OK. (7827404)