This is the caliper gallery seal, which is needed if you plan on breaking apart the actual caliper when rebuilding. This seal fits in between the two halves.
- Early front calipers (for non-vented / solid brake discs) have one gallery seal per caliper.
- Later front calipers (for vented brake discs) have two gallery seals per caliper.
- All rear calipers have two gallery seals per caliper
Please be aware that this seal is only suitable for cars that accept RR363 brake fluid. If your car is a Spirit/ Spur/ Mulsanne model or a Corniche from 1980 (50000 VIN) these seals are incorrect as your car accepts LHM (green mineral) oil - see GALLERYMIN