ABS light on, 94 XE pick up

I started to get the ABS light on the dash after I start the truck. Its a 94 XE EX-CAb 5-speed V6 pick up. It would sometimes come on and now it comes on all the time. I tried looking for the wheel speed sensors up front by the rotors but cant find them. Does this truck have them? could anyone point me in the right direction to trouble shoot. Thanks :confused:

small adjustments can cause this light..

check all brakes and there adjustments..

also fluid levels