Ah.. sorry. Thought it was DOT2. Thanks much. I know, the caliper may go so I may just get two front rebuilds. Ideally I want to replace/rebuild all four and flush the lines/ABS at once. My pads appear new, that is probably the only reason the caliper has not failed. The boot has little room to move.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car