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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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It costs a lot to replace pads/shoes/etc, then there's also the downtime