Rob Posted February 15, 2009 Share Posted February 15, 2009 I've got a 72 R685ST that is loaded with plastic lines, and an 73 RL797L that does not have any except the air shift lines, and underdash plumbing. The RL has all Aeroquip hoses and no plastic with the exception of the aforementioned areas. My 77 R795, and 78 RL755L have no Aeroquip lines at all. Everything is plastic after the air compressor. All of the trucks use a copper, or steel discharge line from the compressor that converts under the cabs to plastic or Aeroquip.Is this the difference between an eastern, and western built trucks?Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
Greg Rider Posted February 15, 2009 Share Posted February 15, 2009 Sounds to me like a difference between plants, suppliers, build specs., lowest bid, repairs over the years, etc. Quote #1 on A-model registryIf I drink because of work, why can't I drink at work? Link to comment Share on other sites More sharing options...
Rob Posted February 16, 2009 Author Share Posted February 16, 2009 Sounds to me like a difference between plants, suppliers, build specs., lowest bid, repairs over the years, etc.Quite possibly there Greg. That Aeroquip hose is expensive and I'll bet there is in excess of 100 feet of different sizes on the 73 truck. It has wedge brakes and all five lines from each axle are aeroquip. It is also factory as the original paint on the frame also covers the hoses, fittings and everything else. Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
Bollweevil Posted February 16, 2009 Share Posted February 16, 2009 My 73 RS797LST had some of each. That is not surprising, considering it's age. My observation is that the plastic seems to hold up better. It weathers better and apparently is impervious to oil, inside and outside. It is less expensive and easier to work with, but it wont stand up to heat as well. As far as to what is original, only a build sheet would tell. Quote Link to comment Share on other sites More sharing options...
terry Posted February 16, 2009 Share Posted February 16, 2009 With a 35 year truck it would be hard to tell what all has been updated with the air lines, but would a 35 year old truck even have original plastic lines, most trucks that old ran copper didn't they. terry Quote Link to comment Share on other sites More sharing options...
HK Trucking Posted February 16, 2009 Share Posted February 16, 2009 With a 35 year truck it would be hard to tell what all has been updated with the air lines, but would a 35 year old truck even have original plastic lines, most trucks that old ran copper didn't they. terryFrom what I've observed over the years, plastic air lines came on the scene around 1970, at least in Mack trucks anyhow. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment Share on other sites More sharing options...
Rob Posted February 16, 2009 Author Share Posted February 16, 2009 With a 35 year truck it would be hard to tell what all has been updated with the air lines, but would a 35 year old truck even have original plastic lines, most trucks that old ran copper didn't they. terryI can't answer that qualitatively as there are no splices in the aeroquip lines at all. The lines are point to point run, and have been there many years. The frame is aluminum and brown in color as are all the hoses, tanks, valves and all underpinnings.The 72 truck does not appear to be changed from "as built", but I'm not sure there either.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
maxidyne237 Posted February 17, 2009 Share Posted February 17, 2009 I think it might of been an option to substitute to braided line. I have seen Kenworth log trucks optioned that way because of the exposed lines and sparks from welding and torching on the log bunks. Quote Link to comment Share on other sites More sharing options...
Quality Posted March 9, 2009 Share Posted March 9, 2009 Both Synflex and the Aeroquip are very tough hoses. Both will do a great job, some customers in the vocational area like the aeroquip hoses better, but the synflex is tough as nails.. don't discount that plastic (synflex) piping...mike Quote Link to comment Share on other sites More sharing options...
ducky698 Posted April 30, 2009 Share Posted April 30, 2009 Both Synflex and the Aeroquip are very tough hoses. Both will do a great job, some customers in the vocational area like the aeroquip hoses better, but the synflex is tough as nails.. don't discount that plastic (synflex) piping...mikeThe 69 flintstone i just pulled down had aeroquip braided lines and lots of copper lines. I was surprised to see so much copper! I just put it down to when they made trucks back then, they were made to last unlike today.Grant Quote Link to comment Share on other sites More sharing options...
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