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Photo DIY- Lumbar Support Bladder Replacement

49K views 52 replies 23 participants last post by  seafarer  
#1 ·
In a quest to find the etiology of my trunk handle "mysteriously" Popping out overnight, I was questioning my wife about her car, and she mentions the Lumbar Support just happened to be out as well.

Hmmm.. so while investigating the lumbar support, I turn the lumbar selector to "ZERO", and... lo and behold the Trunk Handle works perfectly.

This tells me there must be a leak in the bladder.

Hooking up an air supply directly to the bladder inflow tube... I hear a "SHHHHHHHHHHHHHHHHHHH" coming OUT of the seat back.

As you can see, there was "quite" a hole in the 11 year old, BRITTLE bladder.

Please be advised, this post is NOT! the WIS specified procedure. WIS instructs you to take the seat out, and basically tear the thing apart... this is to Install the Hard Felt White Backing along with the bladder.

Yes I normally am "by the book", but in this case, it looked safe enough to just keep the stiff Felt backing in-situ, and just remove the old bladder, and Slide in the new one.

It worked great, and took no time at all. The new bladder was $42.

So, here's a post that hopefully will help someone. In my search on the topic, there is NO info on "How To"...

Sorry the post is not as "Detailed" as I would have liked... to be honest it was an afterthought, while I was putting things back together....

G
 

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#3 ·
as always another great DIY

I know it has been mentioned before but I just cant accept the fact that we cant reset the bladder pump ourselves. I hate having to bring this to the stealer. any chance someone else has an idea?


EDIT : added to knowledge base
 
#4 ·
g-amg. great diy. may i ask where did you get the bladder? i have the same problem with my 140. i was able to buy the bladder for the driver's side seat but the bladders for the passenger side seat is unavailable. please tell me where i can buy this part....thank you
 
#12 ·
G-AMG, that's a good post, but not up to your usual quality. I looked through every picture carefully, and not ONCE did I see the Rolex. :p

Nice job and I like the shortcut from the WIS. No reason to do more work than necessary. Has me thinking about removing the top part of the seat on my 210 to change the heater element, but...

Take care and enjoy the well-inflated ride,
Greg
 
#13 ·
Excellent thread :bowdown:


This afternoon I removed both bladders with ease - found the passenger side to work fine! The drivers side has split along the seam. Currently it is sitting in the garage with a book on it after I injected silicone into the seam in an attempt to seal it. I tried to re-seal it using an iron on low heat, but it just melted it without sticking together. Also tried hot melt glue but that failed to adhere to the bladder. If the silicone fails to stick after curing overnight I think superglue is the next contender. I was thinking about one of the vacuum sealer things you see on those informercials - they suck the air out of your bag of frozen vege and hot seal the plastic together. But I dont have one, nor know anyone who has one! Another option I thought of was to use a bicycle puncture repair kit - the type that uses rubber patches and vulcanizing cement, but will have to buy one.

One thing though - I put the working bladder into the drivers side (they are identical) and when I tested it I ended up moving the rivets right to the top hole of adjustment. Else the support just pushed on my belt area not the small of my back. Now - the seat is superbly comfortable!

I will post up the results of my repair as they come to hand !
 
#16 ·
I will post up the results of my repair as they come to hand !
Well as promised I have found a very cheap solution !

I picked up one of those travel neck supports, the inflatable U shaped ones used for sleeping on planes. Cost? NZ$9.

Got a shortish length of aquarium air line tubing, cut the tube off the broken bladder and pushed the airline tubing over it. The other end is a very snug fit into the neck support.

Hardest part was getting it into position - ended up folding the sides down to make it a rectangle and used a bit of paper to help slide it all through.

Very cheap and easy fix. I was quoted NZ$150 for ONE bladder from the dealer so it was just not realistic to buy benz in this case.

It's been in the car and running between setting 3 and 4 for the past four months without ANY issues.
 
#17 · (Edited)
Just found out that the Drivers seat in our W140's have 3 bladders and not just 1. it's called Lateral support bladder Prt number is 140 910 09 75 (driver's seat only) and for the U shaped bladders like G-AMG replaced here in this threat on the previous page are, Prt #Left seat 140-910-2375 / Prt# Right seat 140-910-2475 .
I didnt want to belive it so i rang 4 different Mb spares here in Sydney to confirm they say the same thing , since i only could and can only see 1 bladder ,lol , the other 2 aparently inflate the sides of the seats .
Nothing surprises me anymore with this car ,5 years and still more new things pop up ,lol . :thumbsup:
 
#20 ·
Part Numbers:
Left (passenger) 140 910 23 75
Right (Driver) 140 910 24 75
$365pair trade - Retail est $200+ each
Still available for out W140 .Parts were manufactured in 9 Jan 12
Sticker on pack suggests something to do with being made by IAC

That plug goes down to the switch on the side of the seat. the Switch goes down to PSE pump. Complicated but simple really.

The old ones 18 years old no good
 

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#26 ·
your trunk handle should work fine as they are different lines from the pump. if your having troubles you may need a new pse pump or have a leak in the line or the plunger for the handle is no good. if you hear a his in the back of your seat leave the switch on "0" until you fix it so the pump wont be stressed out.

pull the back of your seat off and you can see the bladder to inspect it then go from there.

i think it's a bit of misconception that if one thing leaks all the others do. all the accessories from that strong little pump are on different sections to what they provide pressure or vacuum to.

I replaced my pump a few weeks ago for about $500 us.
My trunk handle wouldn't pop out for 5 or 6 seconds, climate wouldn't shift the air from top vents to bottom for ages. rear headrests wouldn't fall ,
fuel door wouldn't open, door locks took ages and sometimes failed to open.
it's important to have a healthy pump then you can go from there.
that's my opinion anyway
 
#27 ·
^^ The pump that is in the car was replaced about 6months ago. Before i owned it our family Dr. bought a reman pump for almost $500. The pump is running strong lol. But yeah idk why the trunk lip keeps coming out. Im guessing it comes out when im driving over a bump or something.
 
#29 ·
You are correct! i havent gotten a chance to pull anything off yet but i do notice that Hsssss noise when i sit on my driver seat. I notice it happens when the car sits for a bit. I always wondered what the heck that noise was lol. Where can i find that bag?
 
#30 ·
I would leave the trunk handle alone until you fix your lumbar support as it may work as per normal after you fix the leak if you have one. do it one at a time if you know what i mean.

Refer to the pictures supplied at the start of this thread for diagnosis.
To remove the seat back take out he torque or Phillips head screws and the cover comes away nice and easy. If you look into the back of the seat you will just be able to see the bag. the hoses had broken clean off mine (as seen in my pictures) let alone the seems of the bag being torn apart.

whatever age your w140 it's an old car now and if those bags are yellow instead of clear it's time for some new ones. i presume your in the usa where they are cheap as i was just told.

i replaced mine today. they never worked when i brought the car in Feb it is soooooooooooo good.
 
#32 ·
I have a question. I have been noticing for awhile not that my Driver seat makes a "HHHSSSSSSSSS" noice whenever i sit in it. Today i finally decided to see what was the main cause of the hissing noise because i know for a fact i have a vac leak somewhere. My trunk lid latch always comes out at times and there would be times when i first go sit in my car... my trunk opens right up. I did what was on this write up and i saw that my lumbar bags are ok. So i blew into the bag and the air held up. So now im suspecting that maybe the leak could be at the connection to the actual lumbar switch?


On the side note i do notice now that ONLY the front passenger side door assist doesnt work. The rest of the 3 door works.