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Old 04-12-2021, 08:55 PM   #21 (permalink)
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Originally Posted by Piotrsko View Post
I recall some drivers telling me trucks that big trucks which have airbag suspension require a system that restrains lateral movement, which typically looks like and acts like a leaf spring.
Not sure about trucks, but in urban buses sometimes the curb side is set to get lower while on a stop in order to ease entry or exit.


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However, Xist! Should explain what his term actually means to those who did not experience the sandbox.
Doesn't need to go there to figure out what's a spring brake.

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Old 04-12-2021, 09:18 PM   #22 (permalink)
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Commercial and Army vehicles are required to have a spring-operated parking brake, which also automatically comes on when the suspension air pressure drops below 30 psi. That is part of the commercial pre-trip inspection, but not normally part of the Army Preventive Maintenance Checks and Services (PMCS) inspection, although I always did the same test, because we had the same air brake system.
Not that it’s a good idea but the brakes can be caged so you don’t have a parking brake, that is what the little metal holder near the frame holds.


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Old 04-12-2021, 11:01 PM   #23 (permalink)
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A kneeling bus is a bus that not only has no steps between the door and the bus floor, but also has an air-adjustable suspension. This feature allows the driver to actually lower the bus to the curb to make entering and exiting the bus much easier.
https://www.infobloom.com/what-is-a-kneeling-bus.htm
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Old 04-13-2021, 12:43 AM   #24 (permalink)
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So, it's not like leaving your parking brake on then?
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Old 04-13-2021, 01:21 AM   #25 (permalink)
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Not unless you rip part of the air system.
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Old 04-13-2021, 09:14 PM   #26 (permalink)
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Originally Posted by Xist View Post
Not unless you rip part of the air system.
Truckers in my country sometimes clamp defective air brake lines and keep it that way instead of doing proper maintenance until it's too late. In recent years, a few truckers in Brazil have been arrested for driving big rigs with the brakes operating only one axle of the tractor unit.

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