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YOUR RESEARCHSkimming Discs
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Use emery cloth rather than sand paper
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Suggestion
I would also use emery cloth rather than sand paper.
Leading evidence: 'Use emery cloth rather than sand paper' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use emery cloth rather than sand paper' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Use grinding wheel you will inevitably leave abrasive
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Suggestion
If however they use a grinding wheel you will inevitably leave abrasive on the disk which could lead to premature wear.
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Suggestion
Personally I would go the grinding route rather than using a lathe.
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Generation: 20261027T005001Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
My front discs have pitted on the inside surface, the outside face is fine. Discs have very little wear on them since fitting, 5,000 miles/3 years and just suffer a scoring noise at low speed.
I also under stand that the effectiveness on braking is reduced, however I find the C4S braking like hitting a brick wall compared to my VW Camper.
There is minimal cost for me in doing this, other that a few beers.
Question, Are there any issues in skimming the inside faces on both discs I should be aware of before doing it.
It depends on how the work is done and how careful the person is doing the job. If they mount the disks on a lathe and take care with run-out then everything should be fine subject to the disks lieing within thickness tolerance. If however they use a grinding wheel you will inevitably leave abrasive on the disk which could lead to premature wear. For the cost of a new set of disks - I would take this route as you shouldn't need to touch them again for some time.
If you try some of your local engine re-conditioners some of them will have a purpose built machine for skimming disks this would eliminate any run out.
had mine done before for same reasons. asked about pads and was told they pop them out and flat them down on sand paper ona flat surface, if the pads still have plenty of life.
You will need to know the minimum Disc thickness allowed :cop: . I dont know this :dontknow: , but I'm sure another Forum member will :dance: . (Or an OPC Service Dept would tell you) In getting the disc to clean up you need to know there is enough meat to do so.
Personally I would go the grinding route rather than using a lathe. Less chance of burning through cutting heat. You can wash the discs afterward to remove any grit .
The suggestion for bringing the pads up per c4s is a good method as long as you have a good flat plate to work on. I would also use emery cloth rather than sand paper.
Remember the system will need bedding in after reassembly, so take it easy initially until the pads are fully bedded :food: .
Regards Big Bob
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