brake bias ?

[jimmy]

On my Truggy and indeed probably on every 8th scale out there, you can bias the brakes front and rear. So have more rear brakes to get the back end out etc...

Whats the rules on this, is there a preffered setup for them ? Should I have it pretty even, more front, more rear ? ? any ideas ?
I'm not used to having any front brakes in my other cars, so I'm not sure which way to go.