I was backing up my car in the driveway, with steering wheels turned all the way, I heard a click (think on the front of the vehicle) and then immediately I have the brake light sign on & the LCD displaying, "check brake lining."

After doing some research, it states its right next to the brake sensor & check again, however I think due to the noise (quite loud), it may have cracked or something. So, which part do I purchase & be prepared for it if it needs be. Oh, and, is it still safe to drive on the highway with that light?

side note: I have done the brakes myself about 5k miles ago.

Thanks for your help in advance.