Is this normal? lowered ABC suspension after shutdown. - Mercedes-Benz Forum
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post #1 of 17 (permalink) Old 08-04-2016, 06:07 PM Thread Starter
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Is this normal? lowered ABC suspension after shutdown.

2005 W220 S500 with ABC

I have noticed that in the morning before I start my car, the suspension on the front left (driver side) is lowered quite significantly.

When I start the car and press the button to raise the body, the suspensions level out evenly immediately.
There is no problem driving it and ABC itself seems to be working fine considering the pleasant ride quality.

Is this normal?
Could it be a leak? or loss of liquid?
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post #2 of 17 (permalink) Old 08-04-2016, 06:36 PM
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Quote:
Originally Posted by ajunsu View Post
2005 W220 S500 with ABC

I have noticed that in the morning before I start my car, the suspension on the front left (driver side) is lowered quite significantly.

When I start the car and press the button to raise the body, the suspensions level out evenly immediately.
There is no problem driving it and ABC itself seems to be working fine considering the pleasant ride quality.

Is this normal?
Could it be a leak? or loss of liquid?
Not normal, but it happens to many ABC equipped models. It could be a leak or low oil level in the system. Have a look and see if you see any oil on the floor (green oil) or if the oil level on the dipstick shows loss of oil. (Not the dipstick for engine oil)
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post #3 of 17 (permalink) Old 08-05-2016, 03:15 AM
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I can think of a couple of scenarios:

1. Leaky strut or line: in this case you will find some green Pentosin oil under/around the offending strut as calgary pointed out.

2. Malfunctioning valve block: the valve block has a shut-off valve that ensures that the car stays level after turning the engine off (or when pump is not running). The seals of this valve deteriorate over time and it leaks the ABC fluid back into the reservoir through the ABC plumbing. In this case you may not see leaked fluid under the car.

Hope this helps.

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Originally Posted by ajunsu View Post
2005 W220 S500 with ABC

I have noticed that in the morning before I start my car, the suspension on the front left (driver side) is lowered quite significantly.

When I start the car and press the button to raise the body, the suspensions level out evenly immediately.
There is no problem driving it and ABC itself seems to be working fine considering the pleasant ride quality.

Is this normal?
Could it be a leak? or loss of liquid?
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post #4 of 17 (permalink) Old 08-05-2016, 05:43 AM
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Not normal.

It should hold its height for several days. Beyond that period of time, some sag is considered normal.

Generally, it's internal valve block leakage. A rodeo and fluid flush, with new ABC filters, would be the first thing to try. Next is a removal of the valve blocks, disassembly, cleaning, and o-ring replacement. The latter fixed the sag in my ABC car.

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post #5 of 17 (permalink) Old 08-05-2016, 08:21 AM
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Originally Posted by Astro14 View Post
Not normal.

It should hold its height for several days. Beyond that period of time, some sag is considered normal.

Generally, it's internal valve block leakage. A rodeo and fluid flush, with new ABC filters, would be the first thing to try. Next is a removal of the valve blocks, disassembly, cleaning, and o-ring replacement. The latter fixed the sag in my ABC car.
Spot on. If there is no external leak then fluid is bypassing the left side valve in the valve block.

See attached DTB for clarity on the sagging issue. There are also write-ups on doing a fluid & filter change without SDS. I don't think that the original 10 micron filters are still being sold but you want to be sure that you get a 3 micron filter as that is the latest spec.

Good luck,

Bob

(Thanks Astro, I transposed the numbers of course. I have edited to the correct values.)
Attached Files
File Type: pdf DTB PB 32.50-34 Suspension Lowing Issue Causes and Corrections.pdf (147.5 KB, 89 views)
File Type: pdf ABC Oil Reservoir Loacation task design.pdf (37.8 KB, 83 views)
File Type: pdf Filter Active Body Control (ABC) hydraulic fluid.pdf (62.2 KB, 80 views)
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Last edited by mercy-me; 08-06-2016 at 04:17 AM.
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post #6 of 17 (permalink) Old 08-05-2016, 07:06 PM
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I believe that 3 micron (finer) is the most recent filter specification. 10 micron was the previous filter specification. Hard to believe that particles that small will foul the system, but the valves are solenoids, they are electromagnets, and wear particles (steel or iron) will stick to them and cause them to leak when they shouldn't.

Clean fluid is essential to ABC component life.

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post #7 of 17 (permalink) Old 08-06-2016, 04:21 AM
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Thanks again Astro..............................

Some additional reading on the subject here.


Bob
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post #8 of 17 (permalink) Old 08-09-2016, 06:26 PM Thread Starter
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Update on situation.

Thank you for all your advises.
Here is an update. The following are further investigations taken.

1. There seems to be no external leak (what a relief)
2. So value issue is highly thought to be the reason.
3. Does not sag within an hour or two, but is visible after 3~4 hours.
At overnight, tire is even touching the rim, when not in straight position.
4. Returns to normal position when engine is turned on AND "level control" button is pressed. So there is no problem running the vehicle.

However, operating the vehicle or turning steering wheel without once raising the body will probably cause excessive damage to wheel or rims. So need to fix this immediately. Might cause damages in Valet situations.

Actions taken.

First of all, the ABC fluid level was very low.
fluid barely touched the dip stick even when the engine was off (Aus).
Wonder where all the fluid went... (there must be a problem somewhere..)

So I have added about 500ml of ABC fluid to the system, and now is in normal level.
I will observe progress (if it still sags) after 4~6 hours.

If sagging continues, I will have to find time to work on the valves.

Thank you.
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post #9 of 17 (permalink) Old 08-09-2016, 06:34 PM
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If the accumulators, or nitrogen spheres by another name, are failed or failing they can start to fill with the Pentosin fluid.....So you will not see a leak in the closed system, but the fluid is collecting in the spheres.

There is a rubber membrane in the spheres that separate the fluid side from the nitrogen side. This is the component that degrades and fails over time.

P.S. - you are very smart to get on this right away and not let it become a disaster.
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post #10 of 17 (permalink) Old 08-09-2016, 09:44 PM Thread Starter
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Yup, She's still sagging...

Despite the addition of ABC fluid, the sagging is still present.
Looks like I need to take time to work on the valves.

I will update this at a later time.
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