I agree with Simon.
However, on the 4mm to narrow..... people are forgetting.....
When you run the brakes, the brake pads wear away. If you let your pads wear quite a bit before replacing them, then you will (probably) use more than 2mm of pad..... which will give you exactly the amount of piston 'movement' that you'd have with brand new pads and the 4mm thinner disk
Obviously, you'd need to replace the pads earlier with the thinner disk but it's not a complete "no no". However, a larger diameter disk may well be a absolute 'NO NO"....
However, I doubt that you actually need to replace the disk at all: if the disk was hit hard enough to bend.... it would have probably broken. They are surprisingly brittle! Use Simon's methods before you buy anything.
Ian
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