SOHC.co.uk Forums > CB500/550

Front brake arm and caliper

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Beddgelert:
I would appreciate some advice on fitting a front brake caliper arm to my 1974 cb550ko. When I bought the bike as a USA imported barn find it didn't come with a front brake assembly. I have now bought two new brake caliper arms of eBay because they don't seem to fit onto the front fork without clashing with the top of the brake disc. I have checked all of the usual resources but nothing seems to illustrate the assembly on the bike and as it was never fitted on my bike when stripping it down I have no back reference, so....

Should the the arm be able to swing over the top of the disc because I assume that the arm centres on the disc and the caliper sits either side, or

Am I being totally mislead and the arm actually does sits spoke side of the disc and does actually clash with it?

Any help would be greatly appreciated

Honda Al:
Do you have any photos of the problem? We love a photo


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hairygit:
Arm should swing freely over the top of the disc, could be a couple of reasons why you have the problem you have. the arm may well not be what it was advertised as, it could be from a 250/350/360 or 400/4, which have a smaller diameter disc, therefore will cause the issues you describe, OR somebody may have fitted a disc from a 750, which has a larger diameter than the 500/550, also giving the issues you describe. Best thing to do is measure the diameter of the disc to check.

matthewmosse:
If that fails to pinpoint an issue, then in my expirience, the pivot can wear allowing the arm to drop onto the disk, if that had happened it is possible that someone might have attempted a repair and got it wrong with an inserted bush or chemical metal.

Bryanj:
If its a US import I would be 99% certain its a 750 wheel and disc, as said measure diameter and post size. Wheel is ok to use but not disc

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