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I have a 2006 Jeep Grand Cherokee that I bought from a dealer. It has about 45000 miles on it. Runs great. For about the past 4 months, the Brake Trouble light has been blinking every once in a while. This is a brake trouble light and the emergency brake light combined into one. It only does it when I use my brakes or when I hit a bump on the road. I tried to get a DTC code from the computer and nothing shows up in the freeze frame memory. I took it to the dealer and they could not find an issue with the vehicle considering the light wouldn't come on when I took it in(of course). I was wondering if anyone knew where the brake sensors for the brake system are located and what they do and if anyone has any pointers on pinpointing the problem.