Since the sensors' threads are brass, they can and will eventually bond to aluminum (if you don't prevent it and maintain them). We would suggest using a compound between the brass and aluminium (typically we suggest dielectric grease - very easy to find). These compounds get spread onto the valve stem threads and help prevent the bonding between metals (As a side effect it also helps prevent any leaks). I also typically suggest removing the sensors at least once per month to ensure no bonding has occurred, though most trucks will require this regardless to adjust pressures.
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