Where is the Brake Pressure Modulator Valve located to bleed the air out on a 1999 GMC Sierra 1500?

1999 GMC SIERRA
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BUGAJSKI
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My dad has already replaced breaklines and master cylinder but cannot find the where the brake pressure modulator valve is located to bleed the air out for the anti-lock.
Jan 13, 2012 at 4:28 PM
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