SOHC.co.uk Forums > CB350/400
Squeaking front brake
Moorey:
Stop taking the pith. it’s no help to someone with a squeaky brake. Try Making some anti squeal shims for the back of the pads.
Athame57:
--- Quote from: moorey on October 17, 2018, 12:33:42 PM ---Stop taking the pith. it’s no help to someone with a squeaky brake. Try Making some anti squeal shims for the back of the pads.
--- End quote ---
How do I make them?
Moorey:
Try these https://www.ebay.co.uk/itm/LARGE-EBC-ANTI-SQUEAL-SELF-ADHESIVE-BRAKE-PAD-SHIMS-NOISE-REDUCTION-152mm-x-51mm/222026723334?hash=item33b1d2f006:g:ApEAAOSwDuJWxIHK it's easier than getting the shim steel and cutting some out.
K2-K6:
--- Quote from: SteveD CB500K0 on September 23, 2018, 05:37:49 PM ---
--- Quote from: florence on September 23, 2018, 04:45:07 PM ---Turning kinetic energy into sound waves is how these things stop :)
--- End quote ---
Isn't that what a band does Steve?
--- End quote ---
That's much closer than generally appreciated.
With the original type pads containing resins, then it's this component that comes to the pad surface in "glazing" the surface. This is most closely related to string instruments which are bowed with resin on the bowstring to get it to resonate. It's the disc which is making the sonic performance while being exited by the glazed pads.
The normal way to avoid this is, with new pads, you allow something like 50 miles to get them to conform to the disc surface, then you have to raise the temperature by driving it around with the brake dragging until it gets hot enough to burn out the resins that migrate to the pad surface. It literally sets fire to the resins as they come into contact with the disc.
Once this is done, the bike should be ridden without the brake being used to cool it down and not park it so the pads stick to the disc. Prepared like this, they are much harder to glaze as the resin shouldn't be there.
That's for conventional (resin) pads.
Sintered are different. If you imagine a sintered material as more like a sugar cube, the material is pressed together and under compression plus heat it sticks the material together, largely without resins.
Another problem then exists with these in that most sintered material is (or derived from) formulated to work with disc materials that share the surface wear between the two components. This interaction between the two doesn't really happen on these older more stainless discs, so the pad face doesn't glaze as such (not in the conventional sense of resin coated surface) but ends up really polished and results in a very similar resonance causing effect.
Whether we can use this material aggressively enough in the way these bikes are now ridden I don't know. Ideally they need heavy pressure to encourage the surface to be worn quicker.
In addition to this, most modern discs have much more float built in between the disc and mounting rotor which these don't have. This alone makes them more likely to resonate.
It may not be possible to stop these squeaking in comparison to the 750 for example which due to higher weight and speed combined may tip the balance in regard to pad wear.
Athame57:
Hi Moorey...I ordered those. Thanks, I'll keep you posted after fitting.
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