Truck Repair: Parking\Abs light on, daytime running lights, speed sensors

Question
I have a 1992 GMC 1/2 ton pick-up.After driving a few miles during the daytime the parking/abs light comes on and at the same time the daytime running lights go off. At night when I turn the headlights on,the parking/abs light will turn on after a few minutes.This problem began after replacing a corroded brake line to the rear of the truck.The brakes are good and have been bled.What do you think?

Answer
There are some service bullitens about rust on wheel speed sensors on newer vehicles...i don't know if it would cover yours.
Go to the following site, and do a search.

http://www.chevytalk.org/

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Van