Grahem Posted July 7, 2016 Report Share Posted July 7, 2016 hopefully this is something simple the truck is a 73 620 short box, i believe the booster is stock the master is out of a 79 510. as soon as the truck fires the pedal slowly moves downward with out being pushed at all, ive never had to mess with a 620 booster before so im not sure where to start. thanx 1 Quote Link to comment
datzenmike Posted July 7, 2016 Report Share Posted July 7, 2016 Booster has a vacuum leak on the driver's side. Possibly the push rod is not adjusted. You should have about 1/16" of pedal play with the engine off. 2 Quote Link to comment
Grahem Posted July 7, 2016 Author Report Share Posted July 7, 2016 Ok I will check the push rod if its good I will swap it out 1 Quote Link to comment
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