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Ok, If the light is proves out and then stays off then you are done testing the ABS.If there was a fault in the system the light would come back on and glow steady or flash.The only way to test the proportioning valve is to take off the lines and check flow but I would wait to try that. Did you check the wheel cylinders to see if the pistons are frozen by pushing the shoes back and forth against the cylinder.If not can you crack open the bleeder and see if you have any fluid flow there while pressing the pedal? Let me know....I am clicking on answer now in case you find the problem with those steps.Let me know either way and good luck.