I'm trying to fit a new rear brake cylinder and can't get the old one off despite having removed the line nut and bleeder screw. is there a rivit i don't know about. haynes manual arriving soon and i hope that'll help but all replies greatly appreciated.

no its a retaining nut, usually a torx bolt like pictured here:

http://myword.info/d...?id=t_drive_1-a

you can find them in most screw driver or socket sets nowadays. you may have to put your head right under wheel arch to see it as it may be flush. An allen key of the correct size will undo it if it not too tight but dont round it off

Edited 16 June, 201214 yr by Lofty79

Hi and welcome aboard.