The rubber seals will age and crack, and brake fluid will seep, damaging paint. Replacement seals are part # 211 611 833D.
When removing the reservoir for the replacement of a master cylinder, be careful not crack it (refer to procedure in the Bentley manual for proper removal). There are different variations of this reservoir for brake systems with and without a power servo/booster (not all post '71 buses in Europe had the booster). '73-'79 buses with vacuum assist power booster share the same reservoir (part # 211 611 313J), but the original '71-'72 bus reservoir used on master cylinders that work with a booster has a narrower spacing between the plastic nipples at its base. This smaller type reservoir is no longer made. Most likely, if you are replacing a master cylinder on a bus with a power booster, you will receive a '73-'79 master cylinder and might need to buy a new later style reservoir (still available) to fit.
When installing a new master cylinder, use two new reservoir base grommets (211 611 817A) and be sure that your new master cylinder has its O-ring in place before installing it on the power booster.
A commonly used method for cleaning reservoirs: If you are able to re-use your old reservoir but need to clean residue on its inner wall, use solvent and small ball bearings, seal the ports and shake until the grunge loosens.
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