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Friday, July 30, 2021

TPMS alerted to a broken brake system.

 Saw this post that confirms what I have suggested as a possible additional benefit to running TPMS. 

Sensors mounted on metal, bolt in valve stems are more likely to sense the temperature of the metal wheel which will transfer the heat from wheel bearing or brake drag and failure better than they can report the heat generated in the shoulder of a radial tire.

 On a trip I noted that one tire was 20F more than the others.   When fueling the temperature alarm went off at 160F.  The wheel and hub was very hot.   We were 90 miles from the next town, I found a shop that supported Dexter.  They pulled the wheel and drum and one of the brake pads with broken springs fell out.  There was minimum scoring of the drum and they had the replacement brake assembly … it took an hour to fix.  I would not have known this if it wasn’t for the temperature monitor.  And it could have real bad on I-10 in West Texas.

People need to realize that rubber is really a good insulator to heat transfer so the heat generated internal to the tire structure. The hottest spot in radials is at the belt edge which is about 3/8 to 5/8 deep in the tire structure. The color thermographic picture in THIS post shows the location of the hottest spot.

The heat generated by the tire in the shoulder can not be directly sensed or reported by your TPMS.



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