Losing pressure

X5MSD · 05-18-2016, 12:16 PM

Hello all
My front tyre seems to lose 2-2.5 psi every other week
Had the dealer check it out
They sprayed it and found no leeks
Any ideas ?

42pilot · 05-18-2016, 12:39 PM

At 2 - 2.5 ps per week, you won't find it with a leak test in water or soapy water - too slow.

The tire needs to be re-mounted and the wheel rim (where the bead meets the rim) needs to be cleaned spotless. If that doesn't do it, then the tire shop should have a bead sealant they can use. I had to have this done on my Merc.

Doanster · 05-18-2016, 12:44 PM

Could also be the TPMS valve stems. I've had those deteriorate over time and cause slow leaks. Easy thing to check is whether the retention nut is tight enough.
Otherwise, just have the shop install new washers and/or reseat/tighten each one when you remount the tire.

stewy604 · 05-18-2016, 01:01 PM

Agreed on both of the above. A leak that slow could be smaller than a pin-hole. Keep us posted on updates.

X5MSD · 05-18-2016, 04:36 PM

Will keep you posted
Do you think Bmw should be doing this ?

Thank you

alphaod · 05-18-2016, 06:15 PM

Could also be fractures in the rim. My friend's car leaks 2-3 psi a week, found a small crack on the inside part of the rim.

42pilot · 05-18-2016, 09:12 PM

Quote:

Originally Posted by X5MSD

Will keep you posted
Do you think Bmw should be doing this ?

Thank you

If under warranty and original tires/wheels, yes. And don't back down if you get a reply, "it's within specifications". Tell them it's a safety concern and watch them take care of it.

JL350 · 05-19-2016, 10:00 AM

Have you checked the valve to see if it seated properly or leaking? The old fashioned way is some spit on your finger, wipe it across the valve (cap removed) and leave a continuous layer across the top of the valve. A slow leak will push a bubble out and break the film. Replace the valve insert if it is an issue although sometimes just giving it a sharp push in and letting it snap out will help it seat.

Every time I check pressures or add air I test the valve is seated properly before replacing the valve cap, just in case.

05-18-2016, 12:16 PM	#1
X5MSD Lieutenant 353 Rep 440 Posts Drives: X3 40i M Performance Join Date: Jun 2012 Location: Hertfordshire iTrader: (0)	Losing pressure Hello all My front tyre seems to lose 2-2.5 psi every other week Had the dealer check it out They sprayed it and found no leeks Any ideas ?
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05-18-2016, 12:39 PM	#2
42pilot Captain 591 Rep 710 Posts Drives: 2014 X5 35d MSport Join Date: May 2014 Location: GA iTrader: (0)	At 2 - 2.5 ps per week, you won't find it with a leak test in water or soapy water - too slow. The tire needs to be re-mounted and the wheel rim (where the bead meets the rim) needs to be cleaned spotless. If that doesn't do it, then the tire shop should have a bead sealant they can use. I had to have this done on my Merc. __________________ Sold: 2014 X5 xDrive35d MSport
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05-18-2016, 12:44 PM	#3
Doanster Major 627 Rep 1,181 Posts Drives: 2014 F15 Carbon Black M-Sport Join Date: Aug 2009 Location: Oregon iTrader: (0)	Could also be the TPMS valve stems. I've had those deteriorate over time and cause slow leaks. Easy thing to check is whether the retention nut is tight enough. Otherwise, just have the shop install new washers and/or reseat/tighten each one when you remount the tire. __________________ A little mod here, a little mod there...
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05-18-2016, 01:01 PM	#4
stewy604 Lieutenant Colonel 290 Rep 1,547 Posts Drives: 2014 BMW X5 xDrive 35d M Sport Join Date: May 2014 Location: Vancouver, B.C. iTrader: (0)	Agreed on both of the above. A leak that slow could be smaller than a pin-hole. Keep us posted on updates. __________________ 2014 BMW X5 xDrive 35d M Sport Mineral White 2011 BMW 135i M Sport Space Grey 2007 Suzuki GSX-R 750
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05-18-2016, 04:36 PM	#5
X5MSD Lieutenant 353 Rep 440 Posts Drives: X3 40i M Performance Join Date: Jun 2012 Location: Hertfordshire iTrader: (0)	Will keep you posted Do you think Bmw should be doing this ? Thank you
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Losing pressure

05-18-2016, 06:15 PM	#6
alphaod Mmmmm… 1150 Rep 2,426 Posts Drives: F15 Join Date: Oct 2011 Location: New York iTrader: (0) Garage List 2015 BMW X5 xDrive50i [10.00]	Could also be fractures in the rim. My friend's car leaks 2-3 psi a week, found a small crack on the inside part of the rim.
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05-19-2016, 10:00 AM	#8
JL350 Enlisted Member 20 Rep 47 Posts Drives: 2.0D X4 Join Date: Aug 2012 Location: Perth, Australia iTrader: (0)	Have you checked the valve to see if it seated properly or leaking? The old fashioned way is some spit on your finger, wipe it across the valve (cap removed) and leave a continuous layer across the top of the valve. A slow leak will push a bubble out and break the film. Replace the valve insert if it is an issue although sometimes just giving it a sharp push in and letting it snap out will help it seat. Every time I check pressures or add air I test the valve is seated properly before replacing the valve cap, just in case.
	Appreciate 1 Quote