I've had a warping problem with the brakes of my 1999 C230 for some time. I get the front rotors turned, they're good for a couple of months, then they start to pulsate again. This has happened twice, after I replaced everything (all rotors, rear calipers, pads).

Anyhow, last weekend I turned all four rotors, replaced the front pads (epg green), and cleaned up the rear pads. Working OK now, but look at the pictures after a week of driving (about 600 miles). The rear rotors are rusty! Is this normal or is there something else going on here?

The pictures are: Front brakes dusting like crazy, rear rotor rust, rear rotor rust, front rotor is fine.

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2008 ML350
2007 Honda Element
2007 Honda Accord
2009 Honda Civic