Why are school buses so squeaky?

Passenger buses have air brakes like cargo trucks. The squeal is the brake system releasing air and letting the brake pads pull back off of the drum when the driver lets off the brake pedal to start moving again. They use air brakes, which use compressed air to apply pressure to the brake pad.



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This is due to inertia. When the speeding bus stops suddenly, lower part of the body comes to rest while the upper part of the body tends to maintain uniform motion.

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Children, in particular, are at risk from diesel exhaust fumes. Of biggest concern are the ultrafine particles called microparticles that can go deep within the lungs or even enter the bloodstream, Stroebel said. They can trigger asthma and other respiratory responses as well as cancer and other diseases over time.

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Earplugs: Headphones or earbuds can be great, but sometimes the best option is some good old-fashioned earplugs — they help block out the outside noise and let you focus on your rest. Eye mask: With all of the movement on a bus, it's important to bring something that mimics the conditions of a peaceful, dark room.

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Cars measure around 70-80 dB, while busses can reach as high as 80-95 dB.

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Although WD-40 isn't a great lubricant, it does offer some lubrication. Putting ANYTHING lubricious on your brakes is a bad idea. WD-40 will evaporate off in a few days. If you can't wait that long, spray them down thoroughly with brake cleaner and let them dry.

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