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I've been battling an intermittent Ford ABS trouble in my '89 150 xlt 2wd 5.0 for years now. Thanks to the list here I finally have been able to pull the codes. Turns out I'm getting a code 4.
A previous post from last year talked about some tests that can be done but follow up posts never described the tests.
So - the question/s is/are what and how can you test the ABS valve. If there really is no test or it's not conclusive, does the code 4 usually mean changing out the RABS Valve unit on the inside of the frame?