ABS Light On 2000 Mustang GT Conv

[Hotrod316]

2000 Mustang GT, Auto, Conv. The ABS light is coming on in the mornings after about 10-20 minutes of driving (depending on the temp, Hotter it is the quicker it comes on). In the evenings on the way home, if it's in the mid eighties or higher the light will come on when I start the car and stay on for about 20 minutes or so then go off. I have about a 35 minute drive between home and work.