Just purchased used Mono M4 F&R, in vgc. Now I've actually thought about the purchase I'm not entirely convinced it was...erm, the best choice...they seem OK but can't help thinking 'high maintainance'?
I'm assuming the small-large piston combo concept was to 'smooth' power delivery to the disc (is this 'modulation?)? During initial 'play-fiddle-disassemble' session it was clear that the smaller pistons were moving way ahead of the 'seemingly stuck' larger ones?? However, upon fitting the larger ones came into play...I think?
Anyone still using these units? Tips would be welcomed
Perhaps a service will restor mechanical equilibrium?