I was driving my newly aquired '98 F150 down the road tonight and both the red "Brake!" and amber "ABS" lights came on. The truck seemed to continue to drive normally. I quickly double checked that I had released the E-brake and didn't notice anything out of the ordinary. After returning home and regretting buying a well used truck, I shut the truck off and let it sit for a couple of hours. I went back outside and drove it around the block for about 5-10 minutes and no light came on. Any ideas if the warnings return? Thanks.