SOHC.co.uk Forums > CB350/400
Front brake squealing
TrickyMicky:
GOT IT!!! Thanks everyone.
Oddjob:
Oddly enough Mike it was me that posted the bedding in method some time ago. I got it off the SBS website and found it worked very well. The link you posted isn’t as good as the SBS one IMO, no mention of removing the old bedding in material for instance.
Mikep328:
Thanks!! Yes, it was your procedure that I followed with extremely successful results. I had forgotten that it included removing the old material. The link I posted sounded the same to me re the bedding but it is not as thorough as the one you posted/I followed!!
K2-K6:
Worthwhile in emphasis, that of any disc brake system that's giving poor results, one way or another, its all but 100% related to that seal function bring compromised, that's across all system whatever the scale of components.
The hydraulic piston caliper is brutally simple, only the moving piston and its accompanying seal ultimately affect operation. That's aside from leaking etc.
Most, after reasonable time, will get the seal's movement compromised through that operation. These original Honda type have effectively nil weatherproof mitigation with piston boot or other external seal arrangement, and so are vulnerable to the effects of localised atmosphere in way of moisture etc.
Stainless piston will resolve the corrosion of the original plated piston, but it can't do anything for galvanic corrosion of the piston seal groove in aluminium material of caliper. That risk remains there given any electrolytic activity potential. Honda's original 750 manual specifies silicone grease around that area behind the pad, that being extremely repellent to any water ingress etc.
The seal land needs very close detail in cleaning it and removing any of the accumulated aluminium corrosion from the taper space where the seal moves to in normal operation. They have a different lever feel, release characteristics and very low pad to disc friction when thoroughly cleaned and assembled. A compromised example usually exhibiting reduced travel from home position of lever (less pad rollback) and harder/more difficult effort to use the brake, the rotor surface usually taking on a more polished surface appearance is another sign or pad continuous dragging.
I haven't tried one in these caliper, but a Phenolic resin piston may hold advantage in conductivity to ultimately reduce galvanic potential in these system.
Skoti:
--- Quote from: K2-K6 on April 29, 2026, 08:07:24 AM ---Worthwhile in emphasis, that of any disc brake system that's giving poor results, one way or another, its all but 100% related to that seal function bring compromised, that's across all system whatever the scale of components.
The hydraulic piston caliper is brutally simple, only the moving piston and its accompanying seal ultimately affect operation. That's aside from leaking etc.
Most, after reasonable time, will get the seal's movement compromised through that operation. These original Honda type have effectively nil weatherproof mitigation with piston boot or other external seal arrangement, and so are vulnerable to the effects of localised atmosphere in way of moisture etc.
Stainless piston will resolve the corrosion of the original plated piston, but it can't do anything for galvanic corrosion of the piston seal groove in aluminium material of caliper. That risk remains there given any electrolytic activity potential. Honda's original 750 manual specifies silicone grease around that area behind the pad, that being extremely repellent to any water ingress etc.
The seal land needs very close detail in cleaning it and removing any of the accumulated aluminium corrosion from the taper space where the seal moves to in normal operation. They have a different lever feel, release characteristics and very low pad to disc friction when thoroughly cleaned and assembled. A compromised example usually exhibiting reduced travel from home position of lever (less pad rollback) and harder/more difficult effort to use the brake, the rotor surface usually taking on a more polished surface appearance is another sign or pad continuous dragging.
I haven't tried one in these caliper, but a Phenolic resin piston may hold advantage in conductivity to ultimately reduce galvanic potential in these system.
--- End quote ---
Good post and very informative.
But are we not veering off topic a little?
The original post being " Front brake squealing".
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