Include valves in the walk around the car
Valves often sit between spokes or behind a wheel cover and attract little attention. During pressure checks, look deliberately: is the cap present, is the valve visibly crooked, or does the accessible rubber show cracks? These observations can be recorded without dismantling anything. They do not replace a complete leak test.
A cap helps keep dirt and moisture away from the valve opening. Replace a missing one with a cap suitable for that valve. Do not choose a decorative accessory solely for appearance. Material compatibility is particularly relevant to sensor valves; follow the sensor or vehicle manufacturer’s instructions.
Do not force seized components
A cap that will not unscrew normally may be corroded or damaged. Forcing it with pliers can strain the valve, especially if the body turns with it. Have it released correctly. A broken valve can turn a minor maintenance issue into an immediate tyre failure.
Avoid experimenting with the valve core as well. Owning a removal tool does not establish a repair procedure. Escaping air at the valve or continued hissing after a pressure check needs investigation. Tightening a cap is not a dependable repair for a damaged core or valve body.
Ask about valves during tyre service
Rubber valves age regardless of how much tread remains. Appropriate valve servicing therefore belongs in tyre replacement work. On direct TPMS systems, distinguish the sensor, valve stem and sealing components; the relevant service parts may be renewed instead of automatically replacing the complete electronic unit.
Ask which valves or service kits are included in the quote and whether they suit the existing system. Mention any known slow leak so that the workshop does not treat the job as an ordinary replacement. The actual cause may also lie in the tyre or wheel.
After the work, all caps should be present and cold pressures set to the vehicle specification. A wheel that repeatedly differs needs another check. The valve may be small, but it forms part of the airtight assembly alongside the tyre and rim.
