My front discs are F$<K3D. Again. I looked at them today and there's pretty heavy cementite deposits (looks like crackle finish paint!). The deposits are bad enough that they're starting to rub when the brakes aren't applied.
Why did mitsubishi save the few $ to use the old front disc on a heavier car. I can't have the only GLS that chews front discs can I? It's not driving style (very light on brakes, religious use of handbrake when at a stop).
So... what now:
1) get discs skimmed. If they're not skimmed deep enough the cementite won't be removed completely and the discs will rapidly go off again.
2) Accept that the GLS munches front discs, and get some cheap ones (£68, speedways.co.uk)
3) Hope that a better quality disc will solve the problem (£180, Brembo drilled)
Thankfully I've got a set of EBC greenstuff that I won in a competition waiting to be used, so whichever way I go I'll put in new pads and rebuild brakes with new high-temp grease for the pins. And a full complement of anti-rattle plates!