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Old 09-23-2014, 08:42 PM   #1
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Default Dual Tire Pressure Equalization

Greetings all, I'm a new owner of a 2013 Haulmark triple slide with a freight liner columbia 450hp MB. I have been reading about equalizing the tire pressure in the duals using like a crossfire system and was wondering if anyone on the forum uses these, had any luck with them any recommended place that might install them.
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Old 09-23-2014, 09:31 PM   #2
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Welcome aboard.
I looked at this system a couple of times but didn't like the cluttered look.
I hammer the tires every morning and do walk arounds during the day. Check the pressure before leaving and generally when we going to be stopped for a while.
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Old 09-23-2014, 09:51 PM   #3
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Welcome to the forum PapaD !


I run the TST 507 Tire Pressure & Temperature Monitoring system - when i wanna check the tire pressure i turn the monitor on....thats it ! No more dragging out hoses or gauges or starting the truck to use the compressor.

I run sensors on the toad's tires too - the monitor on the dash displays the pressure and temp & alarms if there is excessive temperature, percentage overall or psi decreases in any time (including the toad).

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Old 09-23-2014, 10:35 PM   #4
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I run the tst on the triaxle trailer tires and couldn't be happier. Best money I ever spent. I figure saving two of the 16" trailer tires paid for the unit, one 22.5 on a big rig saved would pay for the unit, and that doesn't even count damage to the coach from a blown tire. Catch a slow leaker going down the road before it goes flat, blows and comes apart. All that is aside from the convenience of never having to use your tire gauge again.
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Old 09-23-2014, 10:41 PM   #5
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Thanks for the info guys, I have also looked at the TPMS as well and really like what I see about them. Just wondered how big a problem it is with different air pressures between the duals or was that all hot air to sell a product..

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Old 09-23-2014, 10:49 PM   #6
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I caught a slow leak my left steer tire - with the TST Monitor....powered it on a couple days before a trip and discovered the tire was down to 90 psi....i pumped the tire up and came back the next day....pressure down again.

it was a bad valve stem (cracked at the base of the wheel & valve stem nut)....i believe, if anything cracked it, it was me or the guy who put the new steer tires on...the gauge i used (at the time) took quite a bit of pressure against the valve stem in order to get a reading and i likely fatigued the stem before i had the TST system.

my toad (wrangler) runs 18 inch wheels & has different pressure than the 22.5's on the coach....no problem for the TST system, different set points with different alarm set points.

i still perform VISUAL inspections of our tires when we stop or before we depart for a trip, but thats only good enough until the tire rolls (could pick up something in less than one revolution).

i know a lot of folks swear by laser thermometers - but they only work when you STOP and they don't tell you squat while you're driving (and sometimes we drive 12-16 hours straight).
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Old 09-23-2014, 10:54 PM   #7
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Quote:
Originally Posted by PapaD View Post
Thanks for the info guys, I have also looked at the TPMS as well and really like what I see about them. Just wondered how big a problem it is with different air pressures between the duals or was that all hot air to sell a product..

thanks PapaD
i set my duals to the same pressure & then monitor them individually for leaks and heat via the TST Monitor...im not sure id want a leaking tire tied to a good / non leaking tire.

of course equalizing the pressure i important - but once you're in the coach and going down the road what can you tell about the tire pressure & its equalization ? (nothing).

theres plenty of TPMS sensors - but not many that do temperature too. Lots of folks (usually the ones that don't have temp monitoring) that pressure is directly related to temperature....and those of us with the TST system can tell you thats not true - pressure increases are NOT linear to temperature increases.

temperature increase can identify an over heating axle or sticking brake....or OVER use of the brakes (in traffic).
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Old 09-24-2014, 10:58 AM   #8
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Thanks again for the info will be moving forward on the purchase of the tire monitoring system, appreciate the help
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Old 09-24-2014, 09:47 PM   #9
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I agree whole heartedely with bushpilot, the temperature function is just as important as the air pressure. You set the alarm for a drop in pressure, or an increase in temperature. Either is a sign of impending tire failure. And he is correct you will see the tire temp go up if you have a bearing or brake problem developing. I once had an emergency brake not completely release and was rubbing slightly. Ninety miles later I finally noticed when the red hot backing plate blew the seals out of the wheel cylinder, the brake fluid caught fire, and I saw flames flickering in my rearview mirror. "Luckily" it was night time or I wouldn't have seen that either. A tire monitor would have sounded as soon as it started to get hot. It used to be my habit at every stop to do a walk around, visually inspect each tire, thump it for pressure, and lay my hand on the wheel to check for anything too hot. With the tst system all I do is the walk around and visual.

It amazes me watching the readout how much the temperature changes in the tires. Pressure, outside temperature, speed, load, even which side is in sun/shade all make a noticeable difference. When I had 15" load range D tires on my trailer I was having tons of tire problems, even though when I scaled it I was within the rating of the tires. But I found that as my load got closer to that point, the tire temperature went up dramatically. And the temps went up far more than the pressure. Even a 1000# difference in the load on a triaxle trailer made a difference. Also the speed, the tires were running way hotter at 65-70 vs. 55-60. Eventually I upgraded axles and went to 17.5 tires and tire problems went away, but I learned a ton with the tst sensors on saving tires, and still run them. The 17.5's were the second best money I ever spent, in a season and a half I have literally not even had to add air to the trailer tires, the spare has never been on the ground, and I was going through 5-6 tires per season before that. I never left the shop without at least 2 spares.

While it is correct to say that the pressure needs to be the same in both dual tires, out in the real world it is not critical that they have to be precisely the same. The theory of course is that the tire with the higher pressure will have a slightly larger diameter meaning it is supporting a bit more than it's fair share of the load, and with the larger diameter the rollout is slightly bigger so the surface of that tire is travelling just a bit faster than the other tire causing faster tire wear. So, like I said out in the real world, you would have to have a pretty serious difference in the pressure for any of that theory to translate into enough reality that you'd notice. 5 or 10psi on a heavy truck tire is not going to make an appreciable difference in any of that, and you can certainly keep track of that with a set of monitors and gain all the other benefits at the same time.
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Old 09-24-2014, 09:52 PM   #10
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thanks Hot rod appreciate the real world info and that is the reason I joined the group. thanks and safe travels
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