Air Brakes

Matheous-2 | 18:59 Tue 14th May 2013 | Motoring

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Am I correct in thinking that if they fail the brakes come 'on' - eg., if a hose were severed the brakes would lose vacuum and the driver would be unable to move the vehicle ?
So, unlike hydraulic brake systems- the air brake default is opposite to the latter? Hope I'm making some sense....

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Hopkirk

Yes, you are correct.

Question Author

Thanks Hopkirk.....I have thought this for a number of years- just never verified
It.....

Math, they have something called a "spring break". Powerful springs keep the brake ON.
Air pressure releases it.

...ahem ..... ^^^^^^ brake ^^

Question Author

Builder- is it not 'vacuum' rather than 'pressure'?

Hopkirk

http://auto.howstuffworks.com/auto-parts/brakes/brake-types/air-brake.htm

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