I have a Problem with my ABS System. When I drive, the ABS Controllight is on. When I press the brakepadel the ABS light switch off. When I make a heavy brake, the ABS is working.

Anybody knows the Problem and can help me ?

I have to say its a Ford F100 with a complete Crown Vic Swap. I have also the ABS System in the car but not the normal steering wheel with the function of the

Thank you very much from Germany