SOHC.co.uk Forums > CB500/550

front brake adjust

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deltarider:

--- Quote from: Johnwebley on January 08, 2024, 11:05:52 AM ---[...] On the 500,a nylon washer which fits between the pad and piston is often included with new pads
But what it does is a mystery, [...]

--- End quote ---
I suppose it is there to dampen vibration and - as a consequence - reduce sqeal.

Sesman:

--- Quote from: Johnwebley on January 08, 2024, 11:05:52 AM ---
--- Quote from: Sesman on January 08, 2024, 10:56:03 AM ---For clarity, the attached is bollox?

https://motorcycleproject.com/text/brake_ills.html

--- End quote ---
For clarification

On the 500,a nylon washer which fits between the pad and piston is often included with new pads

But what it does is a mystery,

So does the 550. I’, gonna give the recommendation a try using thin s/s sheet with corrugations.

I tend to find, the harder you use the brake, the less squeal you get

Sent from my SM-A546E using Tapatalk

--- End quote ---

Bryanj:
A long read and a few points are not total bollox,
1 all the fours had the nylon washer from new and i think genuine replacements came with a new one but aftermarket didnt
2 discs warp due to heat but i have never seen a stainless, standard, honda disc warp
3 never ever seen a gasket between disc and mounting
4 silicone fluid can be used but only if the total system has been stripped out and meticulously cleaned along with new hoses, glycol fluid(dot 3) is fine when it is changed every 2cyears like its suposed to be(but who does?)
5 50 year old brake systems are definately not as good as modern ones, get used to it

deltarider:
Good info, Bryan.
What would be your favourite fluid: DOT 4 or 5.1, both not silicone.
What is the best piston option, material wise? A stainless steel will not corrode, but could it be harmful for the caliper due to eventual electrolysis?

Oddjob:
Just some points to consider.

Mike Nixon was a trained manufacturer instructor. When mechanics go on training courses he's the guy who's training those mechanics in proper procedure and the manufacturers thoughts on problems that the training was there to try and cure. Not only was he a trained Honda instructor, he was also a trained Kawasaki instructor IIRC. As such he'd have had access to information from the manufacturers that mechanics, even trained mechanics wouldn't. This I feel qualifies him to pass on this information which should be at the very least be considered for thoughtful consideration. Far too many people think that because it doesn't match exactly with they think that they should either ignore it or start to criticise it. I'm not saying his word is gospel, just that it should be seriously considered.

Some of the points raised may not be 100% Honda, some may be things which happened whilst at Kawasaki. I think he adds them just in case they will be of use to others reading his thoughts.

I personally didn't find it a long read, short in fact considering the subject matter. I've been on training courses that spent 7 hours on a subject that should really have been 2 hours at most and that would include a hands on training part.

As Mike says the nylon washer was fitted to dampen vibration . Where I think he went wrong was in his description of it as a gasket. What I think he was saying is that it's possible to fit an alternative where a washer that thick would be a problem, something much thinner is required and he found some plastic coated cardboard worked as well but didn't last as long as the nylon washer.

Same things apply to fitting a similar gasket between the disc and the hub, it was fitted to later models but not to the SOHC bikes AFAIK, it just dampens out the metal to metal vibration and may be of use to even some SOHC bikes, just because Honda didn't fit it doesn't mean it can't be of use. TBH not a point I had considered but worthwhile information I think.

I found the brake fluid page very informative, didn't consider going silicone myself but after reading his thoughts on the subject, especially the lack of use these bikes are subject to these days, it may be something that you should at least give some consideration.  All my brake parts are new so for me going silicone will be easy. However if you're one of those who insist on having original rubber brake hoses I can see why that might be a problem. However you now have some information that may make you feel you should reconsider that stance.

As for disc warpage, Bryan is correct, I personally haven't seen a SOHC disc warp but did see other manufacturers discs warp, Suzuki for instance. But they were later models, in the 80s for instance when discs were getting thinner and thinner. As Mike says, the lack of metal due to their thinness meant they overheated easily, this caused them to warp, hence why they started to mount the discs on bobbins, to allow this to happen but the bobbins would try and allow the disc to straighten out afterwards. As Mike says, it doesn't always work.

Interesting to note Mike saying sintered or ceramic pads work much better on these old stainless discs than the softer organic pads, these old systems were great back in the day but compared to modern brakes they appear to be really bad, getting them to work better and for longer whilst retaining safety is always a good idea. That may involve fitting a second front disc or maybe having them slotted or drilled, fitting different composition pads which weren't available back in the 70s, maybe fitting different lines like braided to try and avoid the expansion of the old rubber hoses, a different MC maybe, more fluid for less pressure? All points to consider.

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