RunFlat tyres, valve?

[hifihigh]

The car (E92 BMW320d) was reporting low pressure on one corner.

So my dad went to a garage and tried to inflate that tyre. The machine wouldn't put air into tyre.

So he went to a second garage and same again. Then he went to get the tyre changed (nail in tyre it needed replacing).

I suppose my question is; why didn't it inflate. Is there something in the tyre valve that stops it. How do runflats work?

[Fleckers]

had them on my BMW

was able to pump them up and let them down depending upon weight in the car

guess the valve was fubar

[ging84]

the machines in garages are automatic, if there is no air in the tyre at all they don't detect any pressure so they don't try and inflate, they usually have a flat tyre button, which when you press it make it start blowing air even when nothing is attached

[stug45]

Runflat tires don't go flat they lose pressure. Chances are its a big hole.

Replace the tire.