I asked about the wing as it is an indicator of a bad battery when it deploys and won't go back down.
With all the problems indicated by the various indicator lights and the braking problem the air bag light may just be part of the encompassing problem. Perhaps corrosion at a ground on the instrument cluster circuit. Normally I would say no connection between air bag light and other problems, because all the air bags use the Occupant Restraint Controller as their common "brain" and the air bag indicator light is basically controlled by the ORC.
Which gets us back to clearing all the codes, take a short trip and read the codes again. See what comes up. Try disconnecting the battery over night, before you start out on the short test drive. That should clear most codes. Then get the codes read again. GET the exact code numbers, not just some explanation of what was found. A lot can be misunderstood without the exact coded number.