Your Humble Administrator
The TPMS sensors on our RAV4s are aluminum, not brass. If a chrome-plated brass cap is screwed onto the aluminum valve stem, it will eventually "weld" itself in place due to electrolysis. Many folks have found this out the hard way when trying to remove the cap with pliers, breaking the aluminum and ruining the TPMS sensor. Use plastic caps only!Another way the TPM valve stem can be broken:
- is removing the valve stem to deflate tire / during a tire change.
- sometimes the brass threads get corroded & break.