SOHC.co.uk Forums > CB500/550
Fancy a conversion to cast iron discs, anyone done this?
McCabe-Thiele (Ted):
I've seen a disc snap off the centre boss due to a seized caliper on one side.
JezzaPeach:
I had a cast iron disc in the ‘70’s. It was great most of the time and didn’t fade on long descents, but in the wet, ZERO braking!!! So I switched back to the original. Fast forward a few decades, EBC pretty good but now about to try the SBS ceramic ones.
McCabe-Thiele (Ted):
--- Quote from: JezzaPeach on September 27, 2022, 10:59:14 AM ---I had a cast iron disc in the ‘70’s. It was great most of the time and didn’t fade on long descents, but in the wet, ZERO braking!!! So I switched back to the original. Fast forward a few decades, EBC pretty good but now about to try the SBS ceramic ones.
--- End quote ---
I'm quite impressed with the Bembo carbon/ceramic pads + not cheap but they felt good.
philward:
--- Quote from: McCabe-Thiele (Ted) on September 27, 2022, 12:03:17 PM ---
--- Quote from: JezzaPeach on September 27, 2022, 10:59:14 AM ---I had a cast iron disc in the ‘70’s. It was great most of the time and didn’t fade on long descents, but in the wet, ZERO braking!!! So I switched back to the original. Fast forward a few decades, EBC pretty good but now about to try the SBS ceramic ones.
--- End quote ---
I'm quite impressed with the Bembo carbon/ceramic pads + not cheap but they felt good.
--- End quote ---
Thats good to hear Ted, got some on watch on eBay ready to buy for 500 and 750
Lobo:
Funny old thing, but I was up at Lindsay’s place (engine builder / anything automotive) and there on the floor was a Honda wheel he’d put drilled cast iron discs onto, as he prepped a race / bored out ‘750. Very labour intensive he told me, working out the drill pattern with compasses and cardboard template…. which was then used to mark up the disc.
Fundamentally, the holes are indeed to improve wet performance, as they give the water somewhere to go, plus increase surface area for cooling. On the downside there is less surface area for the brake pads to act upon.
Cast iron apparently conducts heat far more efficiently than stainless, and so these discs can be significantly thinner - if the SS discs were of similar thickness they’d warp / dish & seize.
And then there’s the rust…😱.
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