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John74 · 04-15-2016, 12:49 AM

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.

04-15-2016, 12:49 AM	#1
John74 Registered User 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.