FTO AUSTRALIA

as the topic says my master brake cylinder has just sh*t itself, the pedal just sinks to the floor and refuses to bite agressively like it did before the pedal just sinks to the floor, checked my fluid and its below minimum i suspect the master brake cylinder has sh*t itself because i dont see leakage of fluid anywhere along the brake lines...

now how easy are these to replace?

Not to hard to replace the BMC - which you'll probably need to do because if you've gone pedal to the floor and the BMC is low on fluid it will have scored the bores.

First step is to find the leak though.

Will help to have a second person to bleed the lines properly when you reinstall. As long as you keep topping up with brake fluid you will have no issues. Maybe consider swapping over to some Maltech braided lines at this time while you're doing it all? The;y'll have off the shelf items for your car.