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e.g. busses, garbage trucks, etc are very squealy when they brake. Is this due to their use of air brakes, or apathetic maintenance, or something else?

e.g. busses, garbage trucks, etc are very squealy when they brake. Is this due to their use of air brakes, or apathetic maintenance, or something else?

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[–] • 2 pts

Brakes squeal due to resonance between the rotor and pad. New Porsches have squealing brakes because of this.

[–] • 4 pts

The bigger the brakes the bigger the squeak.

Sports cars and buses have big brakes.

[–] • 1 pt

Is that function of the size or function of them using carbon fiber?