E90 Sport Seats Side bolsters deflate

NBTBRV8 · 04-03-2015, 03:28 AM

Guys,

The side bolsters in my sports seats don't seem to hold pressure. Both seem to go down. I presume I need to replace the pump 52107138788?

Anyone else had this issue?

m80theWolf · 04-03-2015, 10:06 AM

They deflate while you're driving, or overnight after you inflated them the night before? Mine seem to deflate if I pump them up for spirited driving, and then get back in the car the next day, but it's not too annoying.

It would be annoying if I had to keep reinflating while driving though.

maxgohan · 04-03-2015, 01:02 PM

If they inflate properly I doubt its the pump, would have to be a leak somewhere....
The pump did its job of inflating

NBTBRV8 · 04-03-2015, 04:31 PM

They deflate while driving after about 1 minute of having pumped them up. I expect them to deflate overnight as BMW used to have them linked to car/key memory back in the early E46 days but found that the system wasn't strong enough to hold pressure for extended periods, so they dropped that function

I think the pump has a one way valve in it to keep them pressurised, I am guessing this is where the issue is as both bolsters deflate quickly.

04-03-2015, 03:28 AM	#1
NBTBRV8 Captain 138 Rep 859 Posts Drives: LCi E60 530i Join Date: Mar 2010 Location: Australia iTrader: (0)	E90 Sport Seats Side bolsters deflate Guys, The side bolsters in my sports seats don't seem to hold pressure. Both seem to go down. I presume I need to replace the pump 52107138788? Anyone else had this issue?
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04-03-2015, 10:06 AM	#2
m80theWolf Private 3 Rep 96 Posts Drives: 2011 BMW 335d Join Date: Mar 2014 Location: Long Beach, CA iTrader: (0)	They deflate while you're driving, or overnight after you inflated them the night before? Mine seem to deflate if I pump them up for spirited driving, and then get back in the car the next day, but it's not too annoying. It would be annoying if I had to keep reinflating while driving though.
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04-03-2015, 01:02 PM	#3
maxgohan Second Lieutenant 13 Rep 245 Posts Drives: pre-lci e90 335i Join Date: Sep 2014 Location: Toronto iTrader: (0)	If they inflate properly I doubt its the pump, would have to be a leak somewhere.... The pump did its job of inflating
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04-03-2015, 04:31 PM	#4
NBTBRV8 Captain 138 Rep 859 Posts Drives: LCi E60 530i Join Date: Mar 2010 Location: Australia iTrader: (0)	They deflate while driving after about 1 minute of having pumped them up. I expect them to deflate overnight as BMW used to have them linked to car/key memory back in the early E46 days but found that the system wasn't strong enough to hold pressure for extended periods, so they dropped that function I think the pump has a one way valve in it to keep them pressurised, I am guessing this is where the issue is as both bolsters deflate quickly.
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