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Whenever I start the truck and it gets vacuum the pedal basically disappears. Still get fluid moving but the pedal is basically just flopping there.
If I pull the vacuum line out of the booster while it's running the pedal is fine
I can literally take my hand and flick it and it will go to the floor, but only when there is vacuum.
If the MC was not bench bled prior to install, it should be. I think you have a lot of air in the system.