Foo - Question about stopping disk brake squeeks
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10-19-08, 02:30 PM
I have determined that the reason disk brakes squeak so loud is because the vibration is not dampened ever. It goes straight from the rotor to the hub. Metal on metal. The brake assemble itself goes straight to the frame. Metal on metal.
If you were to use a tough rubber washer, or even nylon and put them in between the rotor and the hub. As well as in between the brake assembly and the frame; wouldn't this stop most of the vibration in turn stopping most of the noise being distributed?
Please prove me wrong otherwise I'm going to go buy some nylon washers.
10-19-08, 02:33 PM
Why is this in foo?
10-19-08, 02:34 PM
Cuz I only trust my foosters. And there's enough disk brake forums in the mtb section.
mechanics man, mechanics.
10-19-08, 03:54 PM
Having soft materials in the system would cause your brakes to work differently. It will feel soft and modulation would be more difficult due to the sponginess. Best to design it to not create the vibration and resonances to begin with. Some better designs are dual-piston or even quad-piston calipers with the larger piston in the trailing position. On dual-piston designs, you want to offset the location where it squeezes to be more towards the trailing edge of the pads.
And yes, floating rotors do help as well. But you want them to float within rigid boundaries. Notice the buttons that hold the rotor onto the carrier are actually wider than the rotor itself, which have about 1mm of room to wiggle:
10-19-08, 04:03 PM
Define a rigid boundary please.
10-19-08, 04:12 PM
They can float as necessary with virtually no force needed. But once they encounter the boundary of their travel, ZERO movement beyond that edge is possible. On the picture above, there's actually movement possible in the radial and axial planes. When cold you can hold the disc and wiggle it around and it feels like there's nothing holding it on at all. Once it's warmed up, the radial play disappears, but the axial-play is still there to allow for self-centering between the pads.
If you're talking about bicycle brakes squealing, they have a long way to go in development. They're actually backwards right now. The early motorycle brakes had rigidly attached discs with floating calipers. That doesn't work anywhere nearly as well and as quietly as a rigidly bolted down caliper with floating disc.
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