noroots Posted December 31, 2008 Share Posted December 31, 2008 (edited) I have an 85 dmm straight truck with the air valve handle on the steering wheel. It doesnt have a tractor protection valve but I would like to add one and lines to the rear for a trailer. where can I find a schematic and the parts for adding the trailer brakes. What parts do I need to add? Edited December 31, 2008 by noroots Quote Link to comment https://www.bigmacktrucks.com/topic/7817-tractor-protection-valve-and-air-lines/ Share on other sites More sharing options...
Bollweevil Posted December 31, 2008 Share Posted December 31, 2008 You can probably find what you need to know in the Bendix air brake handbook. There is a link posted on page 3 of the Air Systems and Brakes forum Quote Link to comment https://www.bigmacktrucks.com/topic/7817-tractor-protection-valve-and-air-lines/#findComment-28404 Share on other sites More sharing options...
theakerstwo Posted December 31, 2008 Share Posted December 31, 2008 http://diesel.btc.ctc.edu/Brakes/Bendix%20...andbk4_2002.pdf Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/7817-tractor-protection-valve-and-air-lines/#findComment-28405 Share on other sites More sharing options...
cwsnake Posted February 16, 2009 Share Posted February 16, 2009 I have the same problem. I hve a 2005 CV713 tri-axle dump with anti-lock and ATC. The ATC is what causes the problem. I have found the air line diagram but part numbers to add the trailer lines are not there. From what I can tell, I need the Park Brake Control Module and the Tractor Protection Manifold along with assorted lines and fittings. Is there a part list somewhere for this conversion. The dealerships seem to think so but I can't get them to get off their butts and help me (Been trying for almost a year ). I'll do the work myself if I can find what parts I need. Thanks in advance. Quote Link to comment https://www.bigmacktrucks.com/topic/7817-tractor-protection-valve-and-air-lines/#findComment-30945 Share on other sites More sharing options...
dak49 Posted February 17, 2009 Share Posted February 17, 2009 Hi all, I have been hinking about this for a while myself, I don't think it would take much to do this.1st. I think you would need a foot valve for a tractor type truck, (so you would have an air line going to the trailer service) as well as a line going to the hand valve for the trailer brakes (service). As for part numbers, I'm lost. Just trying to think what it would take to turn a straight truck into a tractor/trailer.I think for just the emergency, you could go from an air tank to the control valve on the dash, but for the service, it would need to have a pedal valve to go to the service line as well, unless there is a plugged port for the trailer service line.Maybe you could have a dealer check the part numbers to see if they are the same , or different. (for a truck verse tractor)Pedel valveI hope this helps some.Bert Quote Link to comment https://www.bigmacktrucks.com/topic/7817-tractor-protection-valve-and-air-lines/#findComment-30954 Share on other sites More sharing options...
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