Does anyone have a clue on how to bleed the ABS system on a 1997 GMC Jimmy. We replaced the brake lines to the rear brakes and now the brakes won't bleed correctly. We think the problem is in the ABS unit(big aluminum thingy with brake line coming from the proportioning valve and going to the brakes). It has bleeders, but apparently they don't work. This is related to my earlier post about my converting said Jimmy to 2wd and the ensuing carnage. Must the Jimmy doesn't like be worked on by Ford people.