Every tyre on the car loses pressure as the air in it cools, roughly one psi for every five degrees the temperature falls. A mild afternoon followed by a hard frost can take four or five psi out of all four overnight, and none of it has escaped anywhere. Nothing is leaking. The same air takes up less room when it is cold, and it comes back as the day warms.
That sits behind a fair number of the calls that arrive before dawn. Somebody walks out to a car looking low on one corner with a warning light showing, and a puncture is the reasonable assumption. Often it is not one. The giveaway is that all four are down by roughly the same amount and none has gone soft enough to bulge at the sidewall.
We come out anyway, because the alternative is you guessing in the dark before a long drive. Sometimes the answer is a nail. Sometimes it is a gauge, a compressor and nothing to buy, and we would rather drive to Bickley at four in the morning to say so.
Away from home is when it stings. A hotel car park, a friend's street, somewhere you do not know and where you certainly do not know which fitter to ring. If that happens to be Bickley or anywhere else round Bromley, it is one number. School run in Shortlands or 1am in Bickley, we answer the same. Christmas Day in Shortlands, any day in Bickley: the line is open. A BR1 address in Widmore and one in Masons Hill are the same round.
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Cars here mostly stand outside overnight rather than under cover, on driveways and side roads from Bickley across to Widmore, so they meet the morning at whatever temperature the night left them. It also means we can work at the door with the car standing where it is. A gauge, a valve test and a look round settle the question before anybody drives on it.
A call at half five from a drive near Widmore Road, all four reading low and the dashboard lit up. The temperature had fallen twelve degrees overnight. We set the pressures, tested each valve with soapy water and left without selling anything.
The same symptoms with a different cause near Masons Hill. Three tyres were a touch soft and the fourth was fifteen psi down, which is not weather. A screw was standing in the middle of the tread and it took a proper repair.
A driver near Bromley South had inflated all four at a forecourt after a drive and found them low again by midnight. Nothing had leaked. The pressures had been set on hot tyres and had settled back to what cold ones should read.
Check it rather than ignore it. A tyre four or five psi down after a cold night is normal and returns with the temperature. One that is fifteen down, or soft again the next evening after being filled, has a hole in it and the weather is not the reason.
Because the system compares against a stored figure and knows nothing about the weather. A cold snap sets off a great many of them in the same week. Once the pressures are correct the light usually clears after a short drive.
Yes, every night of the year, and the figure quoted does not move with the hour. Somebody standing over a low tyre at three in the morning with a shift to reach has a genuine problem whether the cause turns out to be serious or not.
Then that is what you are told, and it happens often enough to be worth saying in advance. Being straight about a tyre that is fine is most of the reason people ring back, and none of that rating came from selling tyres to people who did not need them.
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