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4 wheel drums

with all drum brakes.
New VH44 booster.
All lines are correct and vacuum is fine, bled properly and work fine without booster.
But when I connect vacuum and just tap the pedal it’s like I’ve jumped on the pedal.
Anyone had this before?
Is it the master cylinder having the valve in it, or too much vacuum or, or,or
Hopefully one or more of you might have an insight to this.
Thanks!

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