Posted by ASEguy on March 08, 2011 at 03:52:59 from (68.186.162.134):
In Reply to: vacume booster posted by Old Roy on March 07, 2011 at 18:14:56:
The vaccum valve retains vacuum in the booster for power assist in case vacuum levels drop too low, like the truck dies suddenly. Test the pedal quality with the engine not running. Destroy the vaccum in the booster by applying the brake several times and see if the pedal is high and hard. If not look for hydraulic/mechanical concerns. If it is, start it up and the pedal should drop 1-2 inches when the engine starts and achieves at least 15 inches of vaccum at the booster. Hope this helps. Gerard
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