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Aye, defo never had pads squeal in the dry Dez, which rules out any resonance really. And it'd be low frequency, not high frequency.
Check axle is tight and no play in wheel bearings.
Align caliper.
Clean rotor.
Deglaze pads.
Suitable grease on back of pad.
Re-bed.
Cross fingers and ride!
Sorry, another update. This was already an unhealthy obsession of mine but now it has become a little engineering project! 😁
1) Tying the spokes.
I was quite hopeful about this actually, had read a couple of comments elsewhere from people who had eradicated squeal by tying/wrapping spoke crossovers, and also SRAM had patented a little rubber cone which sat between disc and spokes, with the specific aim of damping disc brake noise. I tightly wrapped each crossover with electrical tape then glued the ends to stop it unravelling. I was under no illusion that a few wraps of electrical tape would stop the spokes moving against one another, but figured it might damp out any resonance or excessive vibration.
Forced myself out into the rain last night to check out some local trails. As usual brakes were impressively quiet and strong once I'd burned off what little rain had accumulated on the rotors, but after a few puddle splashes, prolonged showers and lots of wet undergrowth, they were back to their noisy best. No change at all in note or volume.
So I think I have now ruled out noise from pads against pistons, and noise being amplified via spokes, it is quite obviously noise generated between pad and disc and being amplified by the rotors. I've got some EBC red pads coming which are apparently exceptionally soft (I'm not worried about wear, I don't brake much on this bike...) but will reluctantly follow through on my idea of cutting slots in the pads to try and stop the noise.
I also see Magura do thicker, stiffer e-bike rotors in 160mm which will be my next experiment although I don't believe they could be any stiffer than my 140mm, 2mm thick Swissstop rotors with aluminium carriers...
I hope you find the/ an answer!
My dad bike- no hard braking or long descents with a wee one in the child seat on the back- has super loud brakes in the dry.
What do your rotors look like? The more holes in the rotor the better the rotor can remove water from the braking surface and the pad will get scraped by the trailing edges of the holes. Some rotor designs are better than others in the wet so might be worth experimenting?
I have the Magura storm HC rotors, they work brilliantly in the dry, bit of squeal in the wet until they warm up. Partly due to they being thicker than standard SRAM/Shimano rotors, but also because they have a section of rotor with no holes
