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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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[–] • 4 pts

The bigger the brakes the bigger the squeak.

Sports cars and buses have big brakes.