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Old 19 Mar 2004
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R100RS (1982) worn discs

My nice & shiny front brake discs are worn and ridged, can anyone tell me what the wear limit is please? Actually, I'm pretty sure they need replacing, should I go for the cast iron ones (mehanite?) as sold by Motobins or what? Is it possible (and safe) to renew the disc without the carrier, the original discs are riveted on to the carrier and I don't fancy riveting cast iron to anything myself. Would high tensile bolts be OK? Will I then need different pad materials? PS Many thanks Grant for your by-return replies to my other three queries earlier today, I do have a few more, and I hope not to become a bore. Thanks again.

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Old 19 Mar 2004
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I will give my two bits worth on one of your questions. I find the stainless disc on my G/S awful, my R100RT years ago also had average brakes, my laverda and Ducati's with the same Brembo 08 callipers had cast iron discs, the brakes on these bikes worked much better especially in the wet. Mind you they always had a little coat of rust when left for a few days. alec

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Old 19 Mar 2004
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The wear limit for any disc will always be marked somewhere on the disc. Try looking on both sides of the disc carrier - as a guide, 4mm thick is a common wear limit on a lot of stainless discs.

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Old 19 Mar 2004
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I'd definitely go for cast iron, and the Brembo ones are certainly very good. The carrier should come with the disc - it did on the last one I purchased (for a TDR 250). You'll need to fit new pads anyway, so don't worry about matching friction material.

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