SOHC.co.uk Forums > CB350/400

Front brake question

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taysidedragon:
I'm having a bit of a problem with my front brake pivot arm. There's too much play on the pivot. I changed it for a spare one which was better but still has a small amount of play.
Is any amount of play acceptable?

Bryanj:
Do you mean play between pin andarm (radial) or along the pin (axial)?

taysidedragon:

--- Quote from: Bryanj on May 07, 2019, 09:03:12 PM ---Do you mean play between pin andarm (radial) or along the pin (axial)?

--- End quote ---

If I hold the caliper I can move it up and down slightly because of the play at the pivot. Someone told me there shouldn't be any play at all. The pivot pin would have to be a tight sliding fit for no play at all.

Lobo:
... I can move my K2’s caliper up/down about 3mm due radial wear. Has always been like this. The 400F however has zero play, and the SS50 about 1mm. Will be interesting to learn of any published allowable tolerances.

hairygit:

--- Quote from: Lobo on May 08, 2019, 08:03:34 AM ---... I can move my K2’s caliper up/down about 3mm due radial wear. Has always been like this. The 400F however has zero play, and the SS50 about 1mm. Will be interesting to learn of any published allowable tolerances.

--- End quote ---
I seem to remember reading on here some years back that Honda issued some washers/shimming to address the issue on the earlier 750K's, as they had a different design bracket/pin than the 350/400/500/550 and later 750's. With the latest design, if there seems to be too much up/down movement on the pin you can try new "O" rings top and bottom of the calliper arm, or very slightly elongate the holes in the top part of the pin bracket, allowing it to be mounted fractionally lower to take up the wear, but don't move it down too much or the arm may bind causing caliper drag. Also, that is only good for taking up wear at the top and bottom of the arm, if the actual bore in the arm where the pin passes through is worn, find a GOOD engineer (such as Trigger) who can machine it out and bush it to standard size again.

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