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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 09-24-2013, 05:49 PM
Chillax Chillax is offline
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Run Flat Patch

Can I patch a run flat tire? My tire sensor came on the other day (Saturday) and when I pulled into the gas station (about 20 miles later) the tire was noticeable deflated, when I went to put air in it, it was at about 15 PSI. I put it up to 45 PSI, and took it home, and it has been sitting (slowly deflating) since Saturday.

So given all of that would it be safe to patch the tire or do I need to get a whole new tire? I know the dealership will tell me to replace it, just wondering what the opinion here was.

I wouldn't mind saving the $250 for a new tire if it can be patched, but if it has been compromised I would rather spend the money now than later.
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  #2  
Old 09-24-2013, 05:52 PM
fb88 fb88 is offline
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Yes it can be patched if the nail is in the center of the tire (not on the side).
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  #3  
Old 09-24-2013, 06:03 PM
jburke4689 jburke4689 is offline
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just put a plug in it like any other tire. I have gone through 8 tires on mine and I had to plug 2 of them early in their lives. They never leaked again. Just make sure the repair is in the tread and not on the sidewall. You can also patch it internally if you want but you need to take the tire off of the rim.
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  #4  
Old 09-24-2013, 06:08 PM
TXFred TXFred is offline
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Quote:
Originally Posted by Chillax View Post
Can I patch a run flat tire? My tire sensor came on the other day (Saturday) and when I pulled into the gas station (about 20 miles later) the tire was noticeable deflated, when I went to put air in it, it was at about 15 PSI.
In my experience, the sensor should trigger at a higher pressure than that. Is it possible that you didn't reset the TPMS after the last time you inflated the tires?

15 psi is pretty low. It's possible that you damaged the tire before you ever got a warning. You won't know until you dismount the tire, and if it's damaged, they won't legally be allowed to re-mount it.

So be sure you go to a shop who has a spare to sell you, and that you have money on hand to buy a new tire.

I hope I'm wrong.

Frederic
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Old 09-24-2013, 06:39 PM
Chillax Chillax is offline
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I had a low tire indicator about a month ago, stopped at a service station everything looked fine, I filled up with air (again everything was fine, but topped everything up) and reset the sensors.

This time I got the warning light and pulled into a gas station and the tire was noticeably deflated (pulled into the gas station about 45 minutes after the indicator light). I used the the air pump pressure meter to get a reading and it was low around 15 - 20 PSI (but those are notoriously inaccurate). I filled it back up to 45 PSI and when I checked the tire tonight everything looks fine.

I have an appointment tomorrow morning at BMW, but not sure if it is a better idea to just head to a tire shop that will cost me much less, or take it to BMW to get their opinion on what is going on. Will BMW patch it if I tell them to? Or will they insist on only selling me a new tire?

Cheers
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  #6  
Old 09-24-2013, 06:57 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Chillax View Post
I had a low tire indicator about a month ago, stopped at a service station everything looked fine, I filled up with air (again everything was fine, but topped everything up) and reset the sensors.

This time I got the warning light and pulled into a gas station and the tire was noticeably deflated (pulled into the gas station about 45 minutes after the indicator light). I used the the air pump pressure meter to get a reading and it was low around 15 - 20 PSI (but those are notoriously inaccurate). I filled it back up to 45 PSI and when I checked the tire tonight everything looks fine.

I have an appointment tomorrow morning at BMW, but not sure if it is a better idea to just head to a tire shop that will cost me much less, or take it to BMW to get their opinion on what is going on. Will BMW patch it if I tell them to? Or will they insist on only selling me a new tire?

Cheers

BMW has but one opinion: Replace the tire - they cannot be repaired.

Price to match.

Then again....Arrrrrrrrrrrr matey....

.

Last edited by CALWATERBOY; 09-24-2013 at 07:02 PM.
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  #7  
Old 09-24-2013, 07:08 PM
ptrcd003 ptrcd003 is offline
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Originally Posted by TXFred View Post
In my experience, the sensor should trigger at a higher pressure than that. Is it possible that you didn't reset the TPMS after the last time you inflated the tires?

Frederic
He is in Canada - TPMS aren't used. The car uses the ABS sensors to determine if the wheel circumference changes.
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Old 09-24-2013, 07:38 PM
TXFred TXFred is offline
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Quote:
Originally Posted by Chillax View Post
I have an appointment tomorrow morning at BMW, but not sure if it is a better idea to just head to a tire shop that will cost me much less, or take it to BMW to get their opinion on what is going on. Will BMW patch it if I tell them to? Or will they insist on only selling me a new tire?
You'd better ask before you take it in. Once the tire is off of the rim, you're committed. Most shops won't remount a damaged tire because of liability concerns.

As for identifying the damage, what you'll see is little black rubber balls inside the tire. When you pick one up, it will disintegrate into dust. This is the remains of your sidewalls, which have crumbled away due to the constant overflexing as the deflated tire rolled down the road. If you see this, the tire's toast.

Given the cost of new run-flats, if you find yourself needing a replacement, you may want to consider other less expensive options. Personally, I like Pilot Super Sports.

Good luck!

Frederic
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Old 09-24-2013, 07:39 PM
TXFred TXFred is offline
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Originally Posted by ptrcd003 View Post
He is in Canada - TPMS aren't used. The car uses the ABS sensors to determine if the wheel circumference changes.
I learned something new, thanks! Why the difference? Is it due to the colder weather that Canada sees?

Frederic
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Old 09-24-2013, 10:17 PM
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pointandgo pointandgo is offline
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Quote:
Originally Posted by Chillax View Post
Can I patch a run flat tire? My tire sensor came on the other day (Saturday) and when I pulled into the gas station (about 20 miles later) the tire was noticeable deflated, when I went to put air in it, it was at about 15 PSI. I put it up to 45 PSI, and took it home, and it has been sitting (slowly deflating) since Saturday.

So given all of that would it be safe to patch the tire or do I need to get a whole new tire? I know the dealership will tell me to replace it, just wondering what the opinion here was.

I wouldn't mind saving the $250 for a new tire if it can be patched, but if it has been compromised I would rather spend the money now than later.
Some RF tire manufacturers allow repairs under certain circumstances (Bridgestone for example) but the tire has to be dismouted and the interior of the tire inspected. Depending on your tire brand, you should bring it to a dealer that specializes in the tire brand.

"Plugging" is not a safe option. If the puncture is within the immediate tread area...and the tire manufacturer allows repairs, the tire can be repaired with a "pull-through" plug and interior patch...provided that the interior of the tire hasn't been damaged (flaking off of the interior rubber).

Is it a Bridgestone or Conti tire? If the tire has been "run flat" for some time...the interior rubber "inner liner" (air barrier rubber) may have flaked off, making the tire 'non-repairable.' Only an internal inspection (tire dismount) will reveal if this is the case.
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Last edited by pointandgo; 09-24-2013 at 10:20 PM.
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  #11  
Old 09-25-2013, 01:49 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by TXFred View Post
I learned something new, thanks! Why the difference? Is it due to the colder weather that Canada sees?

Legislation - TPMS has been required on all vehicles sold in the USA since, when, 2006?.
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  #12  
Old 09-25-2013, 05:09 AM
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Zooks527 Zooks527 is offline
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Quote:
Originally Posted by CALWATERBOY View Post
Legislation - TPMS has been required on all vehicles sold in the USA since, when, 2006?.
A bit more info. The gubmint started by requiring a means of sensing low pressure which led to FTM (differential wheel speed) sensing. Then, they decided it would be a good idea to be able to go for discrete pressure readings, and moved the entire US fleet over to active sensors in the 2008 timeframe.

Swell idea. Now, if your kid has a 5 or 6 year old used car, they can get to spend $300 ($200 for sensors, $100 for balance and mount) to replace the batteries when the sensors go dead.
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  #13  
Old 09-25-2013, 07:18 AM
mossman35 mossman35 is online now
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Just patched my run flat. Tire sensor never went off and I know the tire was never run below 35 PSI. I happened to catch it quickly and the leak was VERY slow (1psi a week).

They did unmount the tire and patch internally and plug the outside (only correct way to patch a tire). I specifically didn't take it to the dealer because I knew they would only replace the tire. The tire shop damaged my wheel in the process but that's another story.

One question, how does a run flat look deflated??? I thought they looked exactly the same when they had no air in them? Is that the point? If it looks flat maybe it is damaged in some way.
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  #14  
Old 09-25-2013, 02:16 PM
Chillax Chillax is offline
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It did not look flat, but noticeably different then the others.

I am just going to replace it (do not know how long it has been leaking as this is the second time) - not at the dealer though. Dealer cost = $360 with tax and install, my local tire shop = $237 with tax and install.
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