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Old 25th February 2017, 10:52 AM   #1 (permalink)
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Both Rear Tyres losing pressure after 2 weeks?

Hi Guys

Not had a chance to run the car down to a tyre fitter yet, but both rear alloys seem to loose air pressure?

filled to 35psi and 2 weeks later they are down to 15psi - suspect that the valves may be faulty I cant seen any obvious rim cracks or anything

Anybody else experienced this?

Thanks
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Old 25th February 2017, 11:07 AM   #2 (permalink)
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What tyres are they and when were they fitted? I had a slow leak on my 305 section Michelin Pilot Super Sport for a while. I asked Litchfield to check it out and it turned out to be the barcode that the manufacturer applies to the tyres, which means that it doesn't sit flush and create a perfect seal.
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Old 25th February 2017, 11:11 AM   #3 (permalink)
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Mine are Michelin pilot sports

they were fitted they the previous keeper in Dec 2015 i think
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Old 25th February 2017, 11:12 AM   #4 (permalink)
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Did u simply remove the barcode and refit?
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Old 25th February 2017, 11:18 AM   #5 (permalink)
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Mine are Michelin pilot sports

they were fitted they the previous keeper in Dec 2015 i think
Given they've been on teh car for over a year the most likely explanation is you have a simple puncture in both tyres.

Nip to a tyre place and get them fixed.
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Old 25th February 2017, 11:32 AM   #6 (permalink)
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Did u simply remove the barcode and refit?
As Andy has said if they've been on over a year it's likely that it's a puncture. However, what I would say is my leak only manifested itself after around 4 months or so. I was told that depending on which part of the tyre ends up sitting against the ground when you park can dislodge where the barcode is etc.

If it is that, it can be solved by either heating the barcode and pulling it off or just applying extra bead sealant over it when refitting (Though getting the barcode off is obviously better)
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Old 25th February 2017, 12:46 PM   #7 (permalink)
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I would have thought that the bar code would be removed during initial fitting tbh. If it were in a place that it could compromise the seal anyway ...

You might as well try the fairy liquid in water method first and see if you can identify if the leak is coming from the valve or the outer rim. If you cannot see this then it possibly is a puncture or a seal issue on the inner rim. Given the amount of air that you are losing, if this is the problem you will undoubtedly see it.

You could also try over inflating the tyres (maybe to about 45 PSI) to see if that can help seal the tyres back onto the rim - remember to deflate them to the correct pressure before driving though.

None of these may work but they're cheap, easy and quick to do ...
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Old 25th February 2017, 01:14 PM   #8 (permalink)
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I would have thought that the bar code would be removed during initial fitting tbh. If it were in a place that it could compromise the seal anyway ...

You might as well try the fairy liquid in water method first and see if you can identify if the leak is coming from the valve or the outer rim. If you cannot see this then it possibly is a puncture or a seal issue on the inner rim. Given the amount of air that you are losing, if this is the problem you will undoubtedly see it.

You could also try over inflating the tyres (maybe to about 45 PSI) to see if that can help seal the tyres back onto the rim - remember to deflate them to the correct pressure before driving though.

None of these may work but they're cheap, easy and quick to do ...
The barcodes are always right where the bead seal is and aren't always easy to remove. They often need to have a solvent applied and then a screwdriver placed underneath to tease them off. Most of the time they are just left on with no issues however every now and again they do cause leaks and the tyre needs reseating. Michelin actually released a statement at one point saying they were looking at creating a label that is more easily removed although there was no date on this so I'm unsure if this is still an issue.
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Old 25th February 2017, 04:04 PM   #9 (permalink)
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3 slowly deflating MPSS's here too. I get about a month until the Tyre warning is triggered. They were OK for 6 months and then went like this. I doubt it's 3 punctures, decided that it's more trouble getting them off than just inflating every month.
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Old 25th February 2017, 04:38 PM   #10 (permalink)
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3 slowly deflating MPSS's here too. I get about a month until the Tyre warning is triggered. They were OK for 6 months and then went like this. I doubt it's 3 punctures, decided that it's more trouble getting them off than just inflating every month.
That's quite odd, probably the tpms is leaking, you could try the leak test (washing up fluid+water - checking for bubbles around the base of the valve stem) and then try tightening the valve a 1/4turn and retesting.
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Old 25th February 2017, 05:07 PM   #11 (permalink)
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I have the same issue since fitting mpss 8 months ago - 2 are leaking round the inside edge (found this when painting them) - my friend ex tyre fitter said try pumping up to 65psi they may seat better ( let down to required pressure after ) if not get them checked as some garages dont clean the rims properly when changing tyres and leave bits of rubber stuck to the rim, then the new ones dont seal properly
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Old 25th February 2017, 06:34 PM   #12 (permalink)
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I have the same issue since fitting mpss 8 months ago - 2 are leaking round the inside edge (found this when painting them) - my friend ex tyre fitter said try pumping up to 65psi they may seat better ( let down to required pressure after ) if not get them checked as some garages dont clean the rims properly when changing tyres and leave bits of rubber stuck to the rim, then the new ones dont seal properly
Did have the same issue on two of my MPSS, they were re-seated and this solved the problem. Very much doubt your that unlucky to get two punctures.

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Old 26th February 2017, 11:34 AM   #13 (permalink)
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I always take my car to a friend who has tyre garage, whenever he changes the tyres he cleans the wheel up with a dremmel type tool as he said the magnesium wheels are susceptible to surface corrosion build up especially when the roads are salted it's weird is not like it eats into the wheel more like it sits on the surface and overtime breaks the seal causing slow air leak. Since he started giving the wheels this clean up no loss of pressure between tyre changes.
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Old 27th February 2017, 08:31 PM   #14 (permalink)
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weird... I had EXACTLY the same issue with my MPSS. had to put air in every 2-3 weeks. so annoying !
just could not get them to seal properly. had to resort to tyre glue in the end which is really messy.

since then I have gone back to dunlops and they never leak air. must be something to do with the bead design.

easy to check though. wip the wheel off and mix some warm water with a drop of fairy liquid (other brands are available) and squirt all round the rim. leave for a minute or so... if you see tiny air bubbles, thats your leak. mark the position with a pen. flip the wheel and repeat the process..
I found both my rear MPSS to be leaking from the rim. had then refitted, but it started again. and gain... and again. resorted to tyre glue in the end.
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