Vehicle was regularly maintained and did not show any air bag codes on a reader. Was told by tow truck driver a new ball joint failed after recently being replaced. This caused me to lose steering around a small bend and lead me to go straight into a guardrail at 55mph. Upon impact of guardrail and a 10foot drop off the air bag never went off upon a 55mph head on impact. I had be rushed to hospital and with request for lifeline but was unavailable. I spent day and half in hospital and had to have 15 stiches put in my face from where impacted the windshield 2 or 3 times. Insurance totaled out the vehicle however still in possession of it and just ems ride to e.r. cost $3600. The contact stated the police report indicates brake failure or defective(unit 1).