ABC suspension fluid flush in newer cars
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 378
Likes: 114
2015 S550, 2017 GLS450
ABC suspension fluid flush in newer cars
Does anyone have experience flushing the Active Body Control fluid (Pentosin CHF 11s) on a very late model Mercedes? I’ve seen several videos on the older CL and SL class cars but the filter on my W222 2015 S550 is integrated into the hydraulic fluid reservoir and the only way to change the filter is to replace the entire reservoir.
In addition, the WIS does not describe a flush procedure where new fluid is pumped into the system as old fluid is discarded. It only describes a filter procedure where
1) the reservoir is replaced
2) existing fluid is cycled through the new reservoir/filter
3) the reservoir is again replaced with a new one.
I’m all about preventive maintenance but I’ve never heard of anyone doing this kind of filter procedure on his car.
In addition, the WIS does not describe a flush procedure where new fluid is pumped into the system as old fluid is discarded. It only describes a filter procedure where
1) the reservoir is replaced
2) existing fluid is cycled through the new reservoir/filter
3) the reservoir is again replaced with a new one.
I’m all about preventive maintenance but I’ve never heard of anyone doing this kind of filter procedure on his car.
Super Member
Joined: Nov 2010
Posts: 681
Likes: 134
Benz
The portion that comes out with the filter can be disassembled and the filter can be replaced with the same one that goes into older models.
The easiest way to do the flush is to get a tool from AGA tools. they have a video explaining the process as well. Once the filter assembly is pulled out the tool is inserted all the way down into the return port
Link to tool https://www.agatools.com/tool/merced...iABEgKbnPD_BwE
The easiest way to do the flush is to get a tool from AGA tools. they have a video explaining the process as well. Once the filter assembly is pulled out the tool is inserted all the way down into the return port
Link to tool https://www.agatools.com/tool/merced...iABEgKbnPD_BwE
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 378
Likes: 114
2015 S550, 2017 GLS450
The portion that comes out with the filter can be disassembled and the filter can be replaced with the same one that goes into older models.
The easiest way to do the flush is to get a tool from AGA tools. they have a video explaining the process as well. Once the filter assembly is pulled out the tool is inserted all the way down into the return port
Link to tool https://www.agatools.com/tool/merced...iABEgKbnPD_BwE
The easiest way to do the flush is to get a tool from AGA tools. they have a video explaining the process as well. Once the filter assembly is pulled out the tool is inserted all the way down into the return port
Link to tool https://www.agatools.com/tool/merced...iABEgKbnPD_BwE
Super Member
Joined: Nov 2010
Posts: 681
Likes: 134
Benz
Thanks for the reply. I couldn't find any internet posts or videos on the procedure which applies to the newer suspension fluid reservoir in my W222 S class. I'll give it a try with the AGA tool. The cap that holds the filter in place is secured extremely tightly and I was afraid of breaking something while prying the cap loose.
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 378
Likes: 114
2015 S550, 2017 GLS450
I’m still having trouble opening the ABC reservoir on my W222 2015 S550. Does it open from the top? There appears to be a metal clip which holds down a round lid, but the lid will not budge. It doesn’t rotate, and I’m afraid of breaking something if I pull any harder. Part number 2223200014 seems to be easy to order but this only replaces the entire reservoir. I still want to be able to insert the AGA tool to flush the suspension fluid.
Super Member
Joined: Nov 2010
Posts: 681
Likes: 134
Benz
I’m still having trouble opening the ABC reservoir on my W222 2015 S550. Does it open from the top? There appears to be a metal clip which holds down a round lid, but the lid will not budge. It doesn’t rotate, and I’m afraid of breaking something if I pull any harder. Part number 2223200014 seems to be easy to order but this only replaces the entire reservoir. I still want to be able to insert the AGA tool to flush the suspension fluid.
Trending Topics
Super Member
Joined: Nov 2010
Posts: 681
Likes: 134
Benz
That spring clip has to come out first, take that 10mm out and rotate that top piece
I personally haven't flushed a 222 car so can't confirm that the procedure would be the same using that AGA tool
I personally haven't flushed a 222 car so can't confirm that the procedure would be the same using that AGA tool
Last edited by knowbenz; Jul 21, 2019 at 03:12 PM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Thread Starter
Senior Member
Joined: Dec 2008
Posts: 378
Likes: 114
2015 S550, 2017 GLS450
It was held in only by friction from two O rings. It took some force to twist and then pull. It would be nice to replace the O rings but I’m too lazy to measure them. And I’ve confirmed that the AGA tool will fit the W222. Thanks for your help!
The 10mm is only holding the plastic ring which holds the reservoir in place and does not play a part in opening the container. I just removed the metal clip and then firmly twisted while pulling. The lid was seized up with dry crust at the top O ring so it took some force.
Last edited by bkdc; Jul 21, 2019 at 05:43 PM.
Newbie
Joined: Aug 2022
Posts: 1
Likes: 0
s550 2014
Hi there
my 2014 S550 gets a ABC Malfunction error when i drive on bumpy country roads and then cars suspension gets high and it comes down itself after some rime when i turn the engine off.
does anyone know whats going on ?
Any help will be much appreciated
Thanks
Gill
my 2014 S550 gets a ABC Malfunction error when i drive on bumpy country roads and then cars suspension gets high and it comes down itself after some rime when i turn the engine off.
does anyone know whats going on ?
Any help will be much appreciated
Thanks
Gill
Newbie
Joined: Feb 2023
Posts: 5
Likes: 0
From: Dubeninki
CL55 AMG 2001 / CL55 AMG 2004
Hello,
if this is still valid, then most likely you have one or more pressure accumulators damaged, i.e. those pears with nitrogen, because when the membrane that is supposed to cushion breaks, the ABC fluid enters the accumulator, filling it, and hence such symptoms may occur after driving over a hump.
Watch out for mechanics, because they can start the repair by replacing the most expensive parts, such as pumps, then valve blocks, etc. and pressure accumulators are often overlooked as if they were from the stepmother, and this is a very important element of this system.
Regards
if this is still valid, then most likely you have one or more pressure accumulators damaged, i.e. those pears with nitrogen, because when the membrane that is supposed to cushion breaks, the ABC fluid enters the accumulator, filling it, and hence such symptoms may occur after driving over a hump.
Watch out for mechanics, because they can start the repair by replacing the most expensive parts, such as pumps, then valve blocks, etc. and pressure accumulators are often overlooked as if they were from the stepmother, and this is a very important element of this system.
Regards
