Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

I have a 2012 ml350 with airmatic suspension. My light came…

Customer Question
I have a 2012...

I have a 2012 ml350 with airmatic suspension. My light came on and the repair shop said the hydraulic fluid reservoir is almost empty and they said they needed to replace the fluid and bleed the lines. I am confused regarding I thought the system worked on air not hydraulics. Can you help

Mechanic's Assistant: How has the ride been lately? Have you noticed any fluid under the car?

The ride is fine also when I raise the car up and down with the button that raises and lowers it works fine. It is just the light that keeps coming on. I don't see any liquid outside of the air conditioning

Mechanic's Assistant: Are you fixing your ML350 yourself? What have you tried so far?

No I have It at a repair shop. Just checking to make sure I don't get ripped off. Is there actually hydraulics involved in the armatic system?

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Nope that is it

Submitted: 4 months ago.Category: Mercedes
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 34 minutes by:
3/23/2018
Mercedes Mechanic: Eric, Automotive Repair Shop Manager replied 4 months ago
Eric
Eric, Automotive Repair Shop Manager
Category: Mercedes
Satisfied Customers: 35,167
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified

HI,

It has 2 systems for the suspension - the pneumatic air suspension and the hydraulic active roll stabilization system to eliminate body roll on curves and uneven roads.

They are referring to the active roll stabilization system, so they are being upfront and honest with you on this. See below

2012 Mercedes Benz Truck ML 350 4MATIC (166.057)
V6-3.5L (276.955)
GF32.34-P-0002GR Active Roll Stabilization, Function

Vehicle
Steering and Suspension
Suspension
Suspension Control ( Automatic - Electronic )
Description and Operation
Components
GF32.34-P-0002GR Active Roll Stabilization, Function

GF32.34-P-0002GR Active Roll Stabilization, Function
GF32.34-P-0002GR Active Roll Stabilization, Function

System in general
Active roll stabilization increases and improves ride comfort and vehicle dynamics.
This is achieved by the following system features:
- Improved suspension comfort with transverse movement of the body
- Stabilization of the body in the case of transverse inclination, crosswind and uneven loading
- Increased driving safety through forgiving lane-change behavior up to vehicle maximum speed
- Roll stabilization on bends and active wheel load distribution
- Increased responsiveness with significantly reduced steering angle requirements
- Improved torsional flexibility off-road (degree of axle articulation)
- Improved sensing of individual obstacles

On vehicles with active roll stabilization, the conventional (passive) stabilizer bars on the front and rear axle are replaced by 2 stabilizer bars which allow active intervention. Active intervention is made possible by the use of 2 hydraulic rotary actuators. The active roll stabilization control unit regulates the hydraulic pressure in the respective hydraulic rotary actuator based on a characteristics map. The most important input variable is the lateral acceleration of the vehicle. This is measured, on the one hand, by the active roll stabilization lateral acceleration sensor and, on the other, is computed by the active roll stabilization control unit based on the following input factors

If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT/3 STARS OR HIGHER today. Please reply and let me know why, so I can help more/better. All follow up responses are FREE, after completing the required rating
Please remember to rate service using the separate rating page. Thank you

Ask Your Own Mercedes Question
Customer reply replied 4 months ago
Would the warning light come on for the hydraulic active roll. Or is the warning light just for the air suspension
Mercedes Mechanic: Eric, Automotive Repair Shop Manager replied 4 months ago

HI,

It will come on for either system as both have sensors tied into the control module. Any fault, whether from low fluid, air leak, hydraulic leak, compressor, accumulator, or sensor, detected by the control module will trip the warning light.

If for any reason, you can't rate my answer OKAY, GOOD, or EXCELLENT/3 STARS OR HIGHER today. Please reply and let me know why, so I can help more/better. All follow up responses are FREE, after completing the required rating
Please remember to rate service using the separate rating page. Thank you

Ask Your Own Mercedes Question
Mercedes Mechanic: Eric, Automotive Repair Shop Manager replied 4 months ago

At this time,unless you have a further question on this specific issue, please click the OK SERVICE, GOOD SERVICE OR EXCELLENT SERVICE 3 STARS OR HIGHER to pay for services rendered per your customer agreement as this is a PAYSITE and experts are not paid for their time, services, or knowledge until you do so. Thank you.

Please remember to rate service using the separate rating page. Thank you

Ask Your Own Mercedes Question
Mercedes Mechanic: Eric, Automotive Repair Shop Manager replied 4 months ago

Was there something you still had a question on or did not understand part of the answer? If so, please let me know.

If not, then please use the separate rating page to rate service as I did answer your question correctly and provided you with information from the shop manual explaining the hydraulic part of the suspension system

Ask Your Own Mercedes Question
Mercedes Mechanic: Eric, Automotive Repair Shop Manager replied 4 months ago

I noticed we have not yet resolved your concern you asked about. I would sure appreciate it if you would reply so I can offer my skills and knowledge and repair guide access to help as best I can.

~Do you still need more help?
~Confused by my info request or answer?
~Need more time?
~Confused on how the site works?
~Need more detail or a different explanation?

If the answer is YES to any of these just press reply and lets work on this concern some more.

If you have new questions now or in the future please do not hesitate to ask them. If you would like me to assist you. Just bookmark this page so you can access my profile easy and post a new question from the question box on my profile page.
Please remember to rate service using the separate rating page. Thank you

If you have any other questions on this, feel free to ask for more help by clicking the REPLY TO EXPERT button, otherwise please click the OK SERVICE, GOOD SERVICE OR EXCELLENT SERVICE 3 STARS OR HIGHER to pay for services rendered per your customer agreement as this is a PAYSITE and experts are not paid for their time, services, or knowledge until you do so. Thank you.

Please remember to rate service using the separate rating page. Thank you

Ask Your Own Mercedes Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mercedes mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Eric Your Own Question
Eric
Eric
Eric, Automotive Repair Shop Manager
Category: Mercedes
Satisfied Customers: 35,167
35,167 Satisfied Customers
Experience: 20+ yrs. experience as repair shop manager and technician.

Eric is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

29,460 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

4,460 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
2012 Mercedes ML350 4Matic with 60K miles: "spongey ride
Second opinion] 2012 Mercedes ML350 4Matic with 60K miles: "spongey ride (suspension) will upgrading suspension (H&R springs / Bilstein B6) make much difference ?… read more
Lou P. master tech
Lou P. master tech
Mercedes Technician
Bachelor's Degree
4,460 satisfied customers
Marty, I repaired my '03 Mercedes SL55 AMG R230 ABC
Hi Marty, I repaired my '03 Mercedes SL55 AMG R230 ABC system. Replaced all accumulators and repaired hose. I am about to add the Pentosin oil to the resevoir to fill it. What else do I need to be awa… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
S550: I have 2013 merc S550. The ride over any small bumps
I have 2013 merc S550. The ride over any small bumps cause a very unsettled ride. Passengers are tossed around on a manhole cover size bump that my Lexus would hardly feel. It is not the feeling of a … read more
Euro Specialist
Euro Specialist
Owner/Technician
Vocational, Technical or Trade Scho
504 satisfied customers
I have a 2000 S430 and the airmatic warning came on saying
I have a 2000 S430 and the airmatic warning came on saying take to workshop. They diagnosed the problem and replaced the two front shocks. Problem solved. When I push the button on the dash, it says '… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
MBZ ML 500: We have a 2006 MBZ ML500. We had a leak in one
We have a 2006 MBZ ML500. We had a leak in one of the front air bags. We had them replaced at a shop that works on MBZ. 5 months ago Now they are pumped up tight, the ride is very stiff. We took it ba… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
I replace my front suspension on my car because it wouldnt
I replace my front suspension on my car because it wouldn't raise only a few months ago so now my rear suspension may be gone?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
GL450: On my 2007 GL450, I have an Aurmatic malfunction warning
On my 2007 GL450, I have an Aurmatic malfunction warning and the Airmatic button will not engage (light up). Can Airmatic be reset?… read more
Stan
Stan
Technical support engineer
Bachelor\u0027s Degree
106 satisfied customers
What is the procedure for changing the hydraulic oil for a
What is the procedure for changing the hydraulic oil for a SL 600? Just bought a 2001 and the repair receipts indicated a previous owner added non-MB approved hydraulic oil to the pump resevoir.… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Mercedes-Benz 500SEL: Not sure this is your expertise, but
Not sure this is your expertise, but figured I would try first. The same 1992 500 SEL you got me the radio code for is now back on the road after 3 years dormant. Since driving it, the rear end is now… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
97 S500: hydraulic ride system and it feels..going down..stick
I have a 97 S500 with hydraulic ride system and it feels like a roller coaster going down the road. I found the hydraulic resivoir, and it is vary low not on the stick, do i just fill it and im good t… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
Year 2000..VISIT WORKSHOP..transmission goes into Sport mode, and i
I have a 4 Dr, year 2000. The AIRMATIC VISIT WORKSHOP light has appeared. When it does thr transmission goes into Sport mode, and i cannot see the PW,DW, etc. I cannot shift it manually either. When I… read more
Euro Specialist
Euro Specialist
Owner/Technician
Vocational, Technical or Trade Scho
504 satisfied customers
2000 s500: smooth..bumps, does that mean suspension needs replacement
2000 s500 - My car does not have that solid and smooth "mercedes" drive, specially over bumps, does that mean suspension needs replacement?… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
1993 600sec: with 90k on it it acts..no rear shocks..power steering is
I Have a 1993 600sec with 90k on it it acts like i have no rear shocks - no signs of leaks on the shock itself - There are 2 accumulators with no signs of leaks i have been told that it is dangerous t… read more
Marty
Marty
Mercedes Technician
Associate Degree
29,460 satisfied customers
2006 cls55 amg: my warning light came on that said stop car to low
my warning light came on that said stop car to low, how do I get it to raise up so light will go out? this is a 2006 cls55 amg?… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
2003 Mercedes E500: suspension..the trunk, however no way..leak..hoses
How to refill the hydrolic suspencion fluid on a 2003 Mercedes E500 with airmatic suspension w/o 4 matic? Found the reservour in the trunk, however no way to fill it up. Issue was a little leak in one… read more
MasterTech Dave
MasterTech Dave
Technician
Vocational, Technical or Trade Scho
108 satisfied customers
Ml63 amg: I convert to air suspension (airmatic)..ML350
Can I convert to air suspension (airmatic) on my 2010 ML350 BlueTec? the system is standard on the ML64 AMG I believe.… read more
Stan
Stan
Technical support engineer
Bachelor\u0027s Degree
106 satisfied customers
e320: 2 right tires are flat but they are..it squeaks when i turn
my e320 2004 is leaning to the right. kinda looks like the 2 right tires are flat but they are not. it squeaks when i turn on the car. the noise got louder within the hour and it goes away only if pus… read more
promerc
promerc
mercedes diagnostic technician
Vocational, Technical or Trade Scho
553 satisfied customers
I parked the car in the garage while traveling..front end..air-ride
I parked the car in the garage while traveling for a month last month. When I came back, I noticed the front end is lowered. it looks like the front part of my car can't pump air into the air-ride sus… read more
vwnewton
vwnewton
ASE master with L1, Euro Tech
A.S.E. L1 Master and more
580 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x