Have a brake and antilock warning lights on dash. No leaks, brakes work good. Does antilock valve need replacing? How do you reset lights on dash? 1990 Dodge W250 with diesel.Thanks.

 

Coupla sensors could do that. Vacuum sensor and balancing valve sensor. If you disconnect them and the light goes out, you found it. I believe the parking brake switch could do it also.

When the brake warning light is lit and the ignition is on, the ABS automatically drops out and lights the light.