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Tractor Talk Discussion Forum

thanks guys for the air brake advise [update]

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ericlb

03-04-2008 19:42:08




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just saying thanks to all who helped me on yesterdays post on the air brakes, heres what happened; the park cans were not leaking thru the service lines, so i installed another r14 relay valve to eleminate the possibility that mine was a bad new one, same problem, i found a chart at the shop to study and there was a small valve mounted on the side of the r14 that the charge line for the park chambers went to, i installed it on the new relay valve because the old one had it [ the new and old r14 looked identical] well this thing was letting the air return to the relay valve and go out thru the exhaust! i eliminated the valve [ the diagram didnt show it in the system] and spliced the 2 lines togeather , it workes right! what in he?? is the little valve supposed to be?

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Tim in OR

03-05-2008 20:43:52




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 Re: thanks guys for the air brake advise [update] in reply to ericlb, 03-04-2008 19:42:08  
I'm tired and it is late, but I have seen a strange setup something like that to prevent compounding the parking brake and service brake at the same time.Most of the trucks I dealt with didn't have it.
tim in OR



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ericlb

03-05-2008 19:15:17




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 Re: thanks guys for the air brake advise [update] in reply to ericlb, 03-04-2008 19:42:08  
no , the quick release valve is still in the line, this was aparently some kind of a 2 way valve that somebody put there for unknown reasons, it had 2 of the 4 ports capped off and was installed in a unused port of the r 14 relay valve for the service brakes, when air pressure was applied to charge the park chambers, the air went back into the relay valve and out thru the bottom exhaust, the result was no brake realease and rapid loss of air pressure, i am guessing that this valve has failed, and at one time it was simply used to connect the 2 pieces of air line to the park brake, as the illistrated diagram of a air brake set up does not even show this valve, and according to the diagram, nowhere is the park system plumbed into the service system at the relay valve, just courious why the valve was there

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RodInNS

03-05-2008 06:06:09




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 Re: thanks guys for the air brake advise [update] in reply to ericlb, 03-04-2008 19:42:08  
Are you talking about the quick release valve for the maxi's? There would be a control line to the park valve in the dash along with the lines to the maxi cans?



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