Your right Steve - very awkward thing to get off.
I managed to get a small terminal screwdriver under the lip and prise it off. IIRC, the nipple boot is similar to the brake caliper nipple rubber boots , but the heat from the engine seems to make the one on the slave go hard.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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