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[Marks DTM Calib]

The system depends on the tyres being accurately inflated from time to time so you can recalibrate the system

[Auto Addict]

The system depends on the tyres being accurately inflated from time to time so you can recalibrate the system

Yes, I check them every week, that's how I discovered the problem

[Del Boy]

Get the metal ones off, the amount of cars I've had where they've corroded and they stuck on there, even tyre fitters hate them. What was wrong with the black plastic caps I don't know, hence why I bought 1000 of them to replace every metal set I should get in the future .

[feeutfo]

fit them with just a light touch and smear of custard

 

No no no, that's a waste of custard

hmmm, will it stop brake squeal I wonder?

[YZ250]

How do TPM's cope when we caravanners up the pressure for towing by about 10psi. Are they just set for a minimum range and not affected by over-inflation?

My alloy valve caps come off really easy. I fit them and within a week someone has nicked them, so I stick with the plastic ones now. 

Too much custard.

Although it depends on the system iirc. The cheap ones just alert to a threashold, as opposed to give an exact psi. The former being fairly useless I would have thought, other than to convince BMW owners that the car somehow pumps its own tyres up. No really.

Oh but they do my good man..........when you have SIT's installed.   

[Andy B]

How do TPM's cope when we caravanners up the pressure for towing by about 10psi. Are they just set for a minimum range and not affected by over-inflation? .....

The TPMS fitted to my Merc is the type that just uses the ABS to look to see if a wheel is spinning faster than others ie it's flat. (pressure / temp sensors type was an option) After inflating tyres, you just go to the menu on the screen & tell it that all tyre are now OK ....... I suppose it works it out from that.

[YZ250]

How do TPM's cope when we caravanners up the pressure for towing by about 10psi. Are they just set for a minimum range and not affected by over-inflation? .....

The TPMS fitted to my Merc is the type that just uses the ABS to look to see if a wheel is spinning faster than others ie it's flat. (pressure / temp sensors type was an option) After inflating tyres, you just go to the menu on the screen & tell it that all tyre are now OK ....... I suppose it works it out from that.

Ah, that sounds logical, as you clear the message until the next 'event'. 

[Andy B]

Get the metal ones off,  ......

I've just put four new metal caps on my Merc because one of them was a black plastic one. As Mark has already suggested, I'd used a wipe of silicon grease on the threads of each as I fitted them. The old caps came off OK anyway. 

[Marks DTM Calib]

How do TPM's cope when we caravanners up the pressure for towing by about 10psi. Are they just set for a minimum range and not affected by over-inflation? .....

The TPMS fitted to my Merc is the type that just uses the ABS to look to see if a wheel is spinning faster than others ie it's flat. (pressure / temp sensors type was an option) After inflating tyres, you just go to the menu on the screen & tell it that all tyre are now OK ....... I suppose it works it out from that.

That system is normally called DDS (Deflations Detection System) and is a standard Bosch setup which is part of the ABS setup (it detects a differential speed difference between wheels) 

[Andy B]

How do TPM's cope when we caravanners up the pressure for towing by about 10psi. Are they just set for a minimum range and not affected by over-inflation? .....

The TPMS fitted to my Merc is the type that just uses the ABS to look to see if a wheel is spinning faster than others ie it's flat. (pressure / temp sensors type was an option) After inflating tyres, you just go to the menu on the screen & tell it that all tyre are now OK ....... I suppose it works it out from that.

That system is normally called DDS (Deflations Detection System) and is a standard Bosch setup which is part of the ABS setup (it detects a differential speed difference between wheels) 

Now I know   

[Marks DTM Calib]

Got it on the mum bus

[Auto Addict]

Just a thought, could the Insignia be programmed to monitor 6 tyres?

Thinking of the caravan.

[feeutfo]

Does fitting a new tyre affect these?

[Auto Addict]

Does fitting a new tyre affect these?

Don't think so

[albitz]

My old Cavalier has its own unique version of tyre pressure warning.When I go around corners the mudflaps scrape the road due to very soft front suspension.Yesterday It was very obvious that the n/s was making a much louder (and earlier) scraping noise at any attempt at cornering.Had a look at the tyre on that side this morning and its almost flat.