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Old 04-15-2016, 12:49 AM   #1
John74
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Join Date: Apr 2016
Location: Bakersfield Ca
Posts: 1
74 brakes dont work

New master cylinder and a new jb5 brake booster. I bled lines several times and can build up pressure when engine is off. Once I turn truck on I have absolutely no pressure. Does anybody have suggestions.
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