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Replying to Thread:

air brake valve


Created On Tuesday 8, December, 2009 1:19 PM by pdbennett

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pdbennett
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Joined: Mar 2008

Note Tuesday December 08, 2009 13:19 View thread in raw text format
Diesel Talk
I have a 2000 peterbilt 379. When I push in the parking brake button to release the tractor brakes I get air coming out of the air relay valve back in between the frame rails under the fifthwheel. I replaced this valve and thought the problem was taken care of but it will still leaks air out of the relay valve. any ideas on what else could be wrong? All brake pots are new. Paul

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Edited: Saturday October 09, 2010 at 17:34 by pdbennett
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KyleAdam
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Joined: Dec 2011

Note Monday December 19, 2011 03:10 View thread in raw text format
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The air control is best for a two-man operation or when using it on a short duct run for cleaning.The valve itself is able to bleed the air inside automatically, followed with the required fluids. Once the air has been bleed, the pressure inside would be changed more or less.

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alexisrois
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Joined: Feb 2012

Note Monday March 26, 2012 00:11 View thread in raw text format
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Well, when the driver depresses the braking pedal, a bit of air briefly opens up the relay valve's supply port, which then redirects air from the remote air supply directly to the back service brake chambers & quickly applies the back service service brakes.

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maxxypane
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Joined: Mar 2012

Note Monday June 25, 2012 05:27 View thread in raw text format
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Air braking system are much more efficient than hydraulic braking system. First of all, most contemporary air braking system work on a concept known as the triple valve system, that is designed in a way opposite to hydraulic braking system or even formerly used kinds of air brakes.


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