From what you have described, I would be very concerned about the brake fluid ending up in the master cylinder. If brake fluid is getting into the check valves for the vacuum pump, it will likely destroy them as well. Brake fluid is very corrosive and if it ends up in other parts of the engine it's not good. If you find it in the brake booster, I would inspect the vacuum pump as well.

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Sam

84 300SD 350K+ miles ( Blue Belle )