Originally Posted by OldCoot
When my temperature alarm went off it was sure not a bearing or brake issue as the trailer has now traveled over 9,800 miles since it went off. The alarm was set too close to ambient due to me being overly cautious. I have since set it 5 degrees higher and have towed in much higher ambient temps without it going off. I think anyone who ignores the temperature alarm however inaccurate you claim they are will be courting a blowout, tire disintegration, burnt bearing or brakes. Whatever the cause of the temperature rise, I would rather have it than not and will continue to monitor. I really doubt if the temperature will read on the monitor in time to keep the bearing from disintegrating before it is detected.
I'm a bit confused. You say your only experience from a High Temp warning was due to your setting the level too low. How is this a statement that supports using the temp warning as an early warning of a tire failure?
"Blowouts" and the sidewall disintegration are a direct result of excess heat generation internal to the tire sidewall body cord due to extreme flexing that comes from air leaking out of the tire and having lost 20% to 60% of your air.
In my experience as a tire engineer, the low pressure warning will always precede a high temperature warning if we are talking about sidewall flex failure.
If you want to be conservative on any setting it should be the low pressure setting. You should be able to set the warning at cold pressure -10% rather than -15% by simply setting the TPMS "Set Pressure" 5% higher than your goal. An alternative is to ensure the Fast leak and Rapid leak warning levels, that warn of pressure loss from the Hot running pressure, are also set properly.
We do agree that the Temp warning is probably useless for warning of bearing failure but I think a stuck and dragging brake might
raise the contained air temperature to give a warning that something was wrong and a potential of giving some warning is better than no warning at all.