Thanks guys.

[MENTION=227213]wphamilton[/MENTION]: I've never done this before. This was a video I was watching - can I just do what he does step by step? - Basic Bicycle Repairs : How to Install Bicycle Brake Cables - YouTube

[MENTION=3026]alcjphil[/MENTION]: Ah thanks. Yeah it just seems to be gone totally - each time I try and do something a strand of wire seems to pop off . Do I need to buy the protective gray cover (housing?) and the bit at the end with a rubber piece (noodle?) too? Or is there a way I can take those off the previous cable?

Coz right now, there is a little crushed metal cap at the extreme end which is preventing me from doing it. Do I just clip it off or something? Or do I need to buy new housing and a new noodle as well?