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Old 02-04-2019, 07:33 AM
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The threaded rod is used to adjust the pedal free play. As a starting point use about half the threads and see where the the pedal free play stops. The free play should be about 1" or so before you start to feel resistance as the rod starts to push the diaphragm. As a side note don't push the brake pedal on a new, dry master cylinder. There would be a good chance the front piston will stick down.
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