It's probably the booster, as Steve pointed out.
When the booster was rebuilt, what kind of condition was the leather
seal in? Are the vacuum cylinder walls in good condition and flat?
Commonly, the leather seal on the piston becomes very hard and resists
any lubrication placed on the cylinder walls. Add to that the pressure
of the rubber washer placed underneath the seal and the piston often
sticks in the bore. Smitty recommends soaking the leather seal in
neats foot oil for at least a day before reinstalling the piston. This
will soften the leather sufficiently to prevent sticking due to a bad
seal. If the cylinder is not flat, then you have a different problem
and will need to replace it.
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