All the break booster is, is a large diaphragm. you need to get all the fluid out of the vaccum side. so you will have to pull it. assuming there is no damage to the diaphragm i don't see why you would need to replace it. i would be sure all the fluid was out of it, and then re-install it and see how it works.

worst case is there is some damage you didn't find while it was out and now you have to spend the time to pull it agian and install a new one.

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