When they banned all the 'bad stuff' from brake pads I think they had to 'soften' the disc material to make up the lost grip, now the softer discs wear out and go rusty quicker - that is progress for you. Brakes on our Civic and Jazz GE sound a little 'scratchy' after it has been standing for a few days, never noticed it when I used to do 500 miles a week + (discs never had time to get cool, let alone rust LOL).
Have a look at the attached PDF at rear brake discs on my wifes GE, this was the state at around 4 years old and it had done over 30K, these discs passed the first MOT (at Honda dealer) and advisory was 'discs corroded but structurally sound' - I thought they would be a sure fail and had bought new discs but not had time to fit them (Oh how I miss going to work every day LOL)
Seems to be that combination of alloy wheels and rear discs causes problems, the rear brakes pick up all the crap thrown up by front wheels - fitted new discs and since using steel wheels with winter tyres from October to April the rear discs have been OK, probably due to the fact that steel wheels (with much less open area than alloys) protect the rear discs much better. That is why rear discs and calipers give many more problems than front brakes, my earlier Honda Civics and GD Jazz had rear drums and they lasted 100,000 miles and then only new shoes (unlike discs the drums last for ever).
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