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Old 14-12-2018   #16
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Re: Series 4 Turismo banging underneath

It works by sensing differences in wheel speed by reading the ABS sensors.

It worked when I had a slow puncture.

I suspect there could be an ABS issue, get them to check the ABS system.

Never heard of this problem before, the only ones I've seen with Tyre Pressure Measuring System (TPMS) is to do with the so called live systems that read the pressure from sensors in the valve. That seems to be a very flaky system.

But that can't be the problem, because the 500/595 has an ABS based system
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Last edited by RichardH13; 14-12-2018 at 09:14.
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Old 14-12-2018   #17
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Re: Series 4 Turismo banging underneath

Great info there. Thanks Richard.

Given all inputs need a TOLERANCE..
And how little sidewall is in play..

Combined with CENTRIFUGAL FORCE 'reinflating' at decent road speeds.

Its got very little chance of being superreliable..

Example:
The difference between 7mm of tread and 1.6 mm of tread .

could be seen by the ABS as greater than say .

7mm @35psi vs 7mm @05 psi
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Last edited by varesecrazy; 14-12-2018 at 10:14.
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Old 14-12-2018   #18
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Re: Series 4 Turismo banging underneath

An indirect system like this would also need a decent run in the straight ahead to detect a flat as the wheels on the same axle will naturally rotate at different speeds around corners.
I doubt I do any straight ahead in central London!

Like I wrote originally, the banging was mainly on cornering and over the odd bump, straight ahead you couldn't feel or sense any problem.
I know what a flat feels to drive on, which is why this puzzled me to start with.

I reckon the suspension is so stiff it's been "carrying" the flat rear wheel until a corner, which is why the system hasn't detected it, it won't on a corner and on the straight it's just been skimming the road as the suspension has held it up.

I wouldn't volunteer to try it, but I think you could probably remove a rear altogether and still drive it straight, like the old Citroen DS.

I guess this sums up the system.
https://www.thisismoney.co.uk/money/...rs-danger.html
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Last edited by Goudrons; 14-12-2018 at 12:06.
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Old 14-12-2018   #19
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Re: Series 4 Turismo banging underneath

So is the tyre knackered?
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Old 14-12-2018   #20
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Re: Series 4 Turismo banging underneath

Quote Originally Posted by Mercky View Post
So is the tyre knackered?
Personally I'd be more worried about the wheel being knackered.
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Old 14-12-2018   #21
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Re: Series 4 Turismo banging underneath

The tyre and wheel are ok, there was a screw in it but it was repaired with a proper patch from inside, not a dog turd.

What seems to have happened is the stiff suspension has carried it so it just skimmed the road with no weight on the flat rather than rolling with the weight of the car on it.
When it was parked, you just couldn't really tell it was flat.


The other wheel on the axle has taken the weight like this


Only when I cornered did it then weight up on that corner and start to feel like a flat tyre.


I presume that's why the TPMS didn't go off, it's not detected any difference while driving straight and as the wheels will turn at different speeds when cornering anyway, the TPMS obviously can't measure the difference then and warn me.
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Last edited by Goudrons; 14-12-2018 at 17:33.
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Old 16-12-2018   #22
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Re: Series 4 Turismo banging underneath

I'm surprised that it didn't pick it up.

I had a screw in one of my rears and it picked it up in a 30 limit in a straight line. There was enough air in it to get me back home,where I could pump it up a bit and then get it repaired.

I'd certainly mention it when you are getting the next service
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