COASTAL - that brake master cylinder is normal, no need for that portion of the end to be machined. When I replaced my master cylinder it came with two rubber seals for the plastic reservoir to fit - it IS very difficult to get the reservoir out of the old and into the new master cylinder, especially with the new rubber seals the reservoir sits in. You can crack those nipples coming from the reservoir if your not careful. I lubed mine up and still had to trim off some of the nipple flange in order to fit. If it does crack, the plastic can be welded back together with heat. Just be careful.

Brake Booster Replacement - I got my brake booster from Rock Auto for $87, comes with a one year warranty. Make sure you check to make sure your Check Valve is working - if your check valve is leaking that would be an easy fix, easy to check too.

Chris

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1969
Model 220 gasoline
Chassis: W115.010