Author Topic: Skimming rear brake disk  (Read 176 times)

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Offline Whitey

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Skimming rear brake disk
« on: September 22, 2022, 08:07:21 PM »
I’ve scored the rear brake disk on my RD250D - I’m pleading the 5th amendment on how .

It’s 7.4mm thick at the mo and I’m wondering if there is any reason I can’t have it skimmed back to smooth?

False economy or cost effective solution?


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Offline Whitey

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Re: Skimming rear brake disk
« Reply #1 on: September 22, 2022, 09:16:04 PM »
Ok, as it’s pertinent to the topic, I put the pad in back to front (obviously I know the difference between front and back but I’m not going to go into detail as to why and how it happened - it just did…)

So the upshot is, the back of the pad is softer than the disk and most of what felt like scoring is in fact deposits left by the backing of the pad. So, I guess removing them wouldn’t be too much of an issue. I can scrape big pieces of it quite easily.

I’m figuring with a bit effort with a scraper and some fine paper I should be able to get it back to serviceable.


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Offline Scullyh2

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Re: Skimming rear brake disk
« Reply #2 on: September 23, 2022, 01:46:57 AM »
I cleaned this up with a random orbital sander using 50 grit-120 then 220.

Offline Whitey

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Re: Skimming rear brake disk
« Reply #3 on: September 23, 2022, 09:19:43 AM »
I cleaned this up with a random orbital sander using 50 grit-120 then 220.
Thanks, looks lovely, I’ll give that a go.


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Offline Hammer 663s

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Re: Skimming rear brake disk
« Reply #4 on: September 23, 2022, 05:17:46 PM »
It used to be common to turn these down to 5mm to reduce weight. The calipers/pads aren't powerful enough to over heat these in normal riding, and they can lose the mass w/o much risk.