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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Front tyres slowly losing pressure



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      07-11-2013, 12:35 PM   #1
fj
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Front tyres slowly losing pressure

I pump the front tyres up to 40 and about a month later they've slowly lost their pressure to the point that the RFT warning light comes on, the driver's side goes down to around 32 but the passenger side one goes down to around 25, which I suspect is what causes the warning light to trigger.

The tyres are about non-RFTs, 2 years old with ~a good 4/5mm of tread left and i've had them checked for punctures but no one can find anything wrong with them. I've also had the wheels checked for leaks but again, nothing.

Is there anything else that could be causing this?
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      07-11-2013, 12:42 PM   #2
dxb335d
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Either dodgy valves or maybe a slight crack in the alloy.
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      07-11-2013, 01:39 PM   #3
windymissile
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My rear is the same. I get it up to 40 odd and a couple of weeks later its dropped to 32 and the bong goes. Whipped it off and lobbed it in the bath. Found a tiny little puncture. Barely visible.
I'm living with it for now. Should really get it sorted.
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      07-11-2013, 01:56 PM   #4
fj
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I've had the valves replaced and even changed the wheel thinking there might be a small leak somewhere but it's doing the same even with the new wheel.
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      07-12-2013, 12:07 AM   #5
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Quote:
Originally Posted by fj View Post
I've had the valves replaced and even changed the wheel thinking there might be a small leak somewhere but it's doing the same even with the new wheel.
Hi from the above new wheel and valve so it must be the tyre, I had a real biatch of one rear is seamed after the refurb of the tyre it just didnt want to re seat itself on the rim,It slowly lost pressure over a couple of weeks ,The tyre guy removed it and put shit loads off the soap /lube back on and it then must have reseated itself because 12 months and no issues so far
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      07-12-2013, 02:42 AM   #6
blues n twos
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Get a local tyre shop to reseat the tyre and balance the wheel. It's only about 8 and once inflated they can dunk it in water to see if you have a puncture.

Jon
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      07-14-2013, 02:37 PM   #7
fj
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I've had that done several times as well and physically checked it myself when the dunk it in water so i'm at a loss as to what's causing it.

Would it be pointless just changing the tyre anyway?
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      07-14-2013, 08:22 PM   #8
gaza01
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As said it could be the seating of the tyre on the rim. Ive had this before. Get them re-done as blues n twos said
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      07-15-2013, 03:54 AM   #9
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That's what I'm saying though, I've had them reseat it twice in the past couple of months but I'm still having the same problem.
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