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Smokey_Lew's avatar
Smokey_Lew
Explorer
Oct 19, 2015

uneven tire pressure buildup while towing with airbags

Hi everyone, here's thanking you in advance for any help you might suggest for this air pressure buildup issue I'm experiencing.

I'm towing a 25' TT with my 2011 Dodge Ram 1500 and using Firestone "Coil-Rite / Work-Rite" air bags. While towing, I pressure the bags to 30lb using a compressor mounted next to the battery under the hood. The issue I'm having is that the Ram's tire pressure monitor consistently shows my right rear tire building up three lbs. more pressure than the left tire while towing.

I set my tires to their maximum 50 lbs cold pressure as stated on the sidewall before towing. The two front tires will build pressure to about 54 or 55 lbs. while the rear tires will build to about the same on the left but about 3 lbs more on the right. In this example, 55 to 57 on the left and 57 to 59 on the right depending on how hot the outside air temp. is. I try to keep the towing speed at between 60 and 65 mph.

Any ideas on what may be going on? Could it be an air bag issue? The tire pressures stay consistent right and left when the bags are not inflated (normal pressures set at 35lbs all around) and I'm not towing. The people who installed the bags for me said they have never heard of this kind of a problem related to the air bags. Any help would be appreciated.
  • Rotate the wheels and see if the difference follows the tire or is relative to that position on the vehicle.
  • Hi Bryan, thanks for your quick response. The setup I have for the bags is a compressor under the hood of the truck that feeds both bags form a single line. The airbag gauge shows the pressure from that single feed line. I guess you have to assume the pressure in both bags is equal. I think my next step is to pressure up the bags and get under the truck and spray some soapy wanter on the lines and see if I get any bubbles.
  • Have you verified air-bag pressure after towing? I slight leak in one of the airbags will cause the opposite tire to carry little more of the load. At this point however, I would not consider the difference enough to really worry about. You might just need to top off the leaky airbag (most likely a leaky fitting really) partway through a drive. A very small leak might not leak at all when the the lower pressures you run unloaded.

    Another possibility is simply normal variance in the internal telling resistance of you tires, or maybe even a slight tread height variance, which happens after normal tire rotations (and even out as they wear more).