SOHC.co.uk Forums > CB500/550

Any reason for this specific bolt for the brake arm?

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alexdecker:
Hi all

Replacing some parts for the rear brake of my 550F from 1977. Just got all the parts from CMS and discovered too late that I forgot this part, and attaches the brake arm to the frame:

https://www.cmsnl.com/honda-cb550f2-super-sport-550-four-1977-european-direct-sales_model17122/bolt-stopper-arm_90133286000/

Would there be anything wrong with using a normal bolt and riding with that until my next part order? Feel like it’s a little much doing a part order for just one bolt.

Why does this need a special bolt to begin with? Just to be able to lock it with a pin? Seems to me I could just use a regular bolt the same thickness as the thick part of the original bolt? But as usual, I might be missing the bigger picture, so wanted to hear your opinion in here  :)

- Alex

Bryanj:
Its a shouldered bolt so that when the nut is done up tight it can still allow the torsion arm to pivot.
You could probably get away with a collar of the right dimensions and a nylock nut

McCabe-Thiele (Ted):
I agree with Bryan for a short term solution, personally I see a split pin as an essential long term safety feature.

davidcumbria:
If it’s like my 550 k1 it is specially shaped to locate in brake shoe holder. Also it needs a spring clip not a split pin making rear wheel removal easier. Here is a photo of the bolt. You might want to look at your backplate because a hex head wouldn’t fit - but the 500f might be different.

https://www.cmsnl.com/honda-cb550-k1-four-1975-usa_model466/bolt-rear-brake_90127323000/

McCabe-Thiele (Ted):
I think were talking about two different pivots in the rear brakes.

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