BMW Forums : BimmerForums banner

1 - 6 of 6 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
Hello all, new to the forum hence posting here.

I have a 2014 F11 with 70k and I've been having issues with the rear suspension for about 4/5 months now with no warnings on the idrive.

It first started, when I would leave the house in the morning and the back end would be dropped, only to inflate when I started her up and tbf the back end would stay up, for days weeks, but something was obvs up.

I looked online and could see the rear bags going was a common fault, so I got a garage to check the bags before I bought a pair.

When I got my MOT the local garage said he could see a leak on one of the bags after inspection when he sprayed with washing liquid.

So I decided to buy a pair and get them fitted, which cost £300 parts and labour for ASUS bags, the bags were £172 for the pair not super cheap ones.

Got them fitted and all was Ok for a week or so then the car dropped again and now its completely gone as the compressor wont inflate the bags despite it whirring away?

I've been told by the bag supplier its my compressor, but like I say its still whirring away trying to pump but not inflating?

It is now in the garage but its still inconclusive....It has had an auto electrician look at it and he can find no electrical fault so not a sensor issue.

I was just wondering if anyone has had similar issues, i.e. the compressor still working but not inflating? leaky pipes? or a compressor that is shot but misleading because its still working? I'm just a bit confused as to what it can be and don't want to spend hundreds incorrectly as I already have with the bags it seems?

p.s. on the way to the garage I final got a warning about the chassis and to drive moderately 5 months later

Sorry for the long post, any help or advice appreciated as still not got my car back?

Regards

Tom
 

·
Registered
Joined
·
91 Posts
Hi Tom

I went down this road two years ago on a 2013 F11 (same same). Your compressor is bad now I'm afraid. Having allowed the compressor to keep 'topping up' the air bags has finally caused a loss of ability to compress. Although it is making a noise and sounds functional, it's not compressing. And definitely don't go down the level-sensors route, they are not at fault.

I fitted Arnott air bags. They are the best to fit, quite literally plug 'n play. You push the blue / red air lines into the valve, and don't even need to use a spanner to tighten / secure them or the collett. Fab!

The job took roughly 40 mins to do as they are a simple fit only requiring the rear to be jacked up and the wheel removed. There is a panel under the rear of the car with about 11 fasteners that holds the isolation cover over the compressor and to the left of that is the solenoid valve. I released (unscrewed) the air lines from there to help deflate the air bags (after pulling the compressor fuse of course from within the fuse box situated on the RHS of the boot). I have seen some garages save time by just slashing the air bag with a knife and swapping it out without releasing air pressure first, which is a bit savage tbh but that's how some 'less professional' garages roll I guess. A good garage will have a scanner that can not only release the air pressure but inflate the bags also (in 30 sec intervals so the comp doesn't burn out).

Replacing the compressor is also a quick job but will require the rear of the car jacked up. Ie. with 2 jacks, axle stands, etc... again nothing difficult but alias, a new oem compressor is very expensive (£4--500+). I bought an non-oem German compressor from Ebay for £235. It has been working well ever since.

As long as the air bags have been fitted correctly (and tbh it's hard to screw it up) And they are not faulty (cheap Chinese knock-off air bags are almost always faulty), then a new compressor will resolve your problems.

Regards

Steve
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #3 ·
Hi Steve, thanks so much for your response.....I could of sworn I replied last week but for some reason it hasn't shown.

I purchased a German pump, ended up with a WABCO for £330

I'm having a bit of a mare TBH, as I've collected my car from the garage this evening and the suspension is off its head.

collected tonight with much anticipation, car felt great for 2 minutes then the suspension felt hard on my passenger side.

managed to get home, got out and it looks like pimp my ride...…..suspension is over extended on one side and not right, so I contacted garage and they said bring it back tomorrow, so the saga continues....Not happy as ive spent £851 and my situation is no better arrrrggghh!

thumbnail_IMG_1008.jpg thumbnail_IMG_1007.jpg

Anyways many thanks for your response

Regards

Tom
 

·
Registered
Joined
·
2,961 Posts
Can't discount the fact that the new airbags are faulty. If the thing can inflate at any point then the probability is that the compressor is good, or at least capable of generating some kind of pressure.

Next things to check would be the seals on the air lines, connection on the bellows and lastly the controller. Diags should give you some hints if its a duff ride height sensor or something along those lines.
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #5 ·
OK, I guess you cant, These are the springs I bought.....didn't go budget, seem like a decent brand with 5 year warranty.

https://www.ebay.co.uk/itm/2X-PAIR-...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

I think its something to do with the level sensors, as you can see in the above pics the car is lob sided. Never had this issue before new compressor was fitted......back end would drop but it would drop uniformly

The comments below are from a bmw specialist I contacted


"I would see if they have carried out the ride height adaption correctly, if they have and its gone down since then check for leaks or any faults in the system it will often disable the control of the compressor if faults are present"

Anyways thanks for response

Tom
 
1 - 6 of 6 Posts
Top