I finally managed to Dremel the BMC housing in a way it gave me room to poke a small screwdriver in it and lift the circlip out. Here's a picture of what I did: http://www.moregraphics.nl/quattro/images/brakes/BMC_5.JPG Regards, Maurits 1986 GV (Swiss WR) 1985 CGT KV 1982 GL DD