The gasket between the cover and the master cylinder might have a pin hole in it that is letting air into the system. If that isn't it then the brake lines running from the proportioning valve could be leaking too.
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'51 South Bend Model "9A"
'56 Chevy 3600 NAPCO
'74 Chevy Cheyenne Super K20-restored on 37's
'72 GMC Sierra Custom K2500- in progress
'08 GMC Envoy Denali
'12 GMC Sierra 2500HD Denali
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