My 92 Dakota does not seem to have back brakes. My ABS light stays on, any ideas?

 

Are they drums or discs in the back? Sometimes if the theeth are missing on the ABS module, that could trigger the ABS light. Or the sensor could be out of spec and too far away from the teeth, or it could have just shorted out all together. There is also a sensor on the master cylinder, that tends to go bad too.