New front brake discs and pads fitted about 15,000 miles ago, and there's still plenty of life left in both discs and pads.
But recently a slightly rusty band has appeared on the inner surface of the right-hand disc. The band is about 1cm wide, starting at the outside edge of the disc.
I say "recently" because it's only slightly rusty so whatever the problem is, it couldn't have been going on long.
I took the pads off and found them a bit of a tight fit in the caliper, so I cleaned everything up and made sure everything was moving freely. But a week later, the rusty band is unchanged so I don't think that could have been the cause.
Any ideas what to do next?
Ian
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Is it affecting brake performance at all?
If not id say just leave it.
Has the car been stood up for any period of time at all mate that could explain some slight surface corrosion.
If its only light rust not heavy should be ok, if it contiunes to annoy you, perhaps get the discs skimmed and see if the mysteriours rust reappears
Cheers
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Do you mean 1mm from edge of disc? if so you have no problem as the pads don`t work in that area.general rust is normal on a disc as they are exposed to all weathers.where the pads work keeps disc clean areas where pad isn`t working will rust
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I had a Renault that used to do this. Main cause for me was lack of using the brakes. I used to have to change front disks every 18 months of very low mileage. A possibility is sticky slider pins, but I think that mainly affects the outer surface??. Worn slider pins may let the caliper rock and miss a bit of the disk.
I found that once there was a rusty band around the disk, nothing would shift it whilst driving - heavier than normal braking, a bit of left foot on the brake to try to wear the rust down. I think the roughness of the rust just wore that bit of the pad away rather the pad wearing the rust back to shiny iron. Only 80 grit paper would shift it for any length of time.
Martin
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Have you tried removing the build-up of rust around the rim, which makes the disk thicker there than on the wearing area? After a few years' use it can form a rim up to 1mm wider than the disk. Chip it off with an old file or something.
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