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CB750 Caliper rattle

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Lobo:
Thanks Bryan for taking the trouble.
Not certain (after all) it describes my problem and thinking I'm in for a DSS £100 new carrier.
Ah well, tis Christmas after all....
As a general note to all out there we should perhaps bear this in mind if considering a second hand carrier off ebay!
Cheers,
Lobo.

K2-K6:
It does seem that the bulletin deals with a "float" along the shaft that results in a clunk as the caliper mass is moved, and seems to be the right way to control this.

The load path of the pivot axis is arranged so that when the caliper force is applied (braking) then the full length of the pivot is used (this is because it sits partly outside the disc swept area and differs from the fork angle). This is a good situation and should not result in undue stress or integrity during braking as it will natuarally align due to the braking forces. I don't think at this level it's any compromise to safety at all as it essentially has a design to cope with this.

Think you are right to try shims in order to control the movement and clunking when the brake is not in use which is just annoying rather than a particular fault. I have heard it on others over the years so it's by no means isolated.

If it was mine, I'd go with the shims as I've never seen a failure of this part.

One other consideration is the bolts used to fix the brake to the fork leg, these have to be of the correct type and would ordinarily have a dowel type shank that locates the braket in it's correct position and gives positive location, if these have been swapped for bolts with threads right up to the bolt-head then that function is lost and can contribute to spacing issues.

Lobo:
Thanks K2-K6,

DSS had 01 OEM Carrier in stock, a couple of pins,  one 0.1mm spacer & nil 0.2mm. I won't be near the bike until NY day, and so simply thought 'sod it' & ordered the last carrier, pin & shim. My problem is I can only get hands-on with the bikes a couple of days PCM, and to order / play with shims, find not cured & thence DSS nil more carriers was too much to bear!

And ta for the heads up on the shank bolts - will take a look.

The issue, I am 99% sure, is the 'nodding' of the caliper - it was getting silly in that to stop the annoying clunk I was involuntarily applying slight front brake over bumps. Furthermore the Honda bulletin descibes a different problem (seemingly) to what I was experiencing - ie clunk with brake.
Again, thanks for your help.
Cheers, Lobo.

Bryanj:
OK the pin should be a tight fit with no play in the static bracket and a sliding fit with minimal play in the swinging bracket, it is unusual to get excess play in the swinging piece and I have never seen play in the bolted piece, excess play can only be caused by over exuberance of cleaning corrosion after a siezure(which was very common---siezure that is)

Lobo:
Anyone able to help with my caliper carrier - which now doesnt seem to be K2 spec. i ordered DSS p/n 45115300030 only to find its visually identical (almost) but about 1/2" longer than my carrier, and with the stopper bolt hole further down towards the caliper. It fits the holder, but is unusable due stopper bolt hole position...and length!
So...don't know what my bike has - are the forks non-CB750K2?

Out of interest (to the preceding thread) both carriers (old & incorrect new) have (approx) 0.3mm slide up & down the pin. The pin is new, and both carriers exhibit slight nod at the caliper - no play detected in the bolted holder. I fitted the one and only washer DSS had (0.1mm) - which isn't enough, but did lessen the 'nod'. I am (almost) convinced a little more spacings (as per the Honda bulletin) may solve my problem. ie it may simply be the 'Joint -Caliper holder' (ie bolt on piece) jaws are minimally too far apart?.
So...still looking for a Honda 0.2 mm spacer....

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