On a car with pressure sensors inside the wheels, a puncture repair involves a component most people do not know is there. The sensor is bolted or clamped to the inside of the rim at the valve, and every time a tyre comes off, that assembly is disturbed. The sealing parts of it are consumable: a rubber grommet where it passes through the wheel, a nut, a valve core, and a cap that is not merely decorative. Those parts come as a service kit and they are meant to be renewed whenever the tyre is removed.
Skip that and you get a leak at the valve a few months later on a tyre that was repaired perfectly well, which is a maddening thing to pay for twice. So a proper repair on a sensor equipped wheel is the patch, the service kit, and the sensor itself checked while it is accessible, because a sensor is a sealed unit with a battery in it and when that goes the whole thing is replaced. This is the one moment when all of that is easy, and it happens where the car is standing rather than requiring a trip anywhere.
The can of sealant in the boot is a way of moving the car, not a repair. Ring us instead and the wheel comes off where the car is, on a driveway in Barbican Estate or at the kerb, the tyre comes off the rim, and the damage is inspected from the inside. Boxed in on an Aldersgate Street terrace or wide open in Beech Street, say which on the phone. Tight in Whitecross Street, easy in Golden Lane Estate: neither stops the job.
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The Barbican is not a straightforward place to drive out of, and the estate parking around Golden Lane and Fann Street is permit only and full by morning, so a job needing a second visit is a genuine nuisance here rather than a minor one. That is the argument for doing the lot at once: patch, service kit and system reset, all while the wheel is already off and the car is exactly where you left it.
A puncture patched on a car in a bay off Whitecross Street had its sensor grommet and core renewed at the same time, which is rather the point of having the wheel apart.
A car on the Barbican Estate had a slow leak six months after a repair elsewhere. The patch was sound. The sensor seal had never been replaced.
A wheel off near Fann Street showed a sensor that was no longer reporting reliably. Far better found with the tyre already off than a month afterwards.
The consumable sealing parts around the sensor: the grommet that seals it through the rim, the retaining nut, the valve core and the cap. They are designed to be renewed each time the tyre comes off the wheel, because that is when they are disturbed.
Because the seal has already been compressed once, and reusing it is how you end up with a slow leak at the valve a few months later. The tyre repair will be perfectly sound and the wheel will still be losing air, which is an infuriating way to spend money twice.
No. It is a sealed unit with a battery inside, and when that battery goes the sensor is replaced. Having the tyre off is the moment to check it is still reporting properly, because that is when it is easy to reach.
The common ones, along with the tools to reset the system afterwards. It is all part of the same visit rather than something that sends the car off somewhere else.
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