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Air Brakes

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Matheous-2 | 19:59 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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Avatar Image Hopkirk
Yes, you are correct.
20:00 Tue 14th May 2013
Avatar Image Matheous-2
Question Author
Thanks Hopkirk.....I have thought this for a number of years- just never verified
It.....
20:43 Tue 14th May 2013
Avatar Image The Builder
Math, they have something called a "spring break". Powerful springs keep the brake ON.
Air pressure releases it.
22:01 Tue 14th May 2013
Avatar Image The Builder
...ahem ..... ^^^^^^ brake ^^
22:02 Tue 14th May 2013
Avatar Image Matheous-2
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Builder- is it not 'vacuum' rather than 'pressure'?
07:12 Wed 15th May 2013
Avatar Image Hopkirk
http://auto.howstuffworks.com/auto-parts/brakes/brake-types/air-brake.htm
09:09 Wed 15th May 2013

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