W215 suspension

[911mani]

Trying to find replacement ABC pump for CL55 2001. Can you replace with a unit direct from another vehicle or is there a difference in them depending on the age of the car. Please help.

Kind regards.

 

[m2287]

As long as it's from a w215 or w220 it will fit

 

[lexman8]

The replacement pump for my 2001 CL500 was part number A0024666001 up to chassis 030260, date 28/06/2002.

 

[911mani]

Thanks for the response guys. The part number quoted is a match for mine and I have now bought one thanks for your help
Kind regards
911mani

 

[911mani]

After replacing the ABC pump on my car CL55 it seems like the front suspension top mount is gone. I have been told by Mercedes that I ca either replace it with a new unit or a reconditioned unit. Does anybody know if this is possible and who reconditions the Hydraulic suspensions for the CL55.

Thanks

911mani

 

[Borys]

Arnott

Contact them

 

[AMGeed]

https://www.arnotteurope.com/default.aspx

 

[911mani]

Thanks Borys and AMGeed I will contact Arnott and see much appreciated

911mani

 

[lexman8]

I have been told by Mercedes that I can either replace it with a new unit or a reconditioned unit.

Depends on what they say is gone. A very common problem is wear on the top-mount bush which causes the strut assembly to move vertically. If you can see a gap like the one in the second picture in post #5 in the link below then that's almost certainly the problem.

DIY: How to faulty/failing ABC Strut top rubber mounts - Mercedes-Benz Owners' Forums

If this is the problem, it can be easily fixed for under £10.

At last year's MOT I had an advisory on the top mount. I did the fix as described and this year it wasn't mentioned in the MOT. The fix also improves the ride as the ABC ECU gets more accurate data from the strut travel sensor.

 

[Mr Kripling]

The fix also improves the ride as the ABC ECU gets more accurate data from the strut travel sensor.

I'm not sure that's the case. The two sensors for the suspension are the level sensor, which takes its reading from the control arms, and the plunger position sensor. The latter measures the position of the plunger relative to what is essentially the shock absorber tube so has no point of reference to the car's chassis hence changes to the top mount will have no effect on its readings.

 

[lexman8]

I'm not sure that's the case. The two sensors for the suspension are the level sensor, which takes its reading from the control arms, and the plunger position sensor. The latter measures the position of the plunger relative to what is essentially the shock absorber tube so has no point of reference to the car's chassis hence changes to the top mount will have no effect on its readings.

I think the issue is that the 10mm gap at the top isn't fixed and as the wheel moves vertically the gap constantly varies from 0 to 10mm. As there shouldn't be any gap at all, the wheels actual position relative to the chassis can be 'out' by up to 10mm. But thinking about it, I guess the level sensor would still give correct readings in this situation anyway.

I did the fix to remove the MOT advisory but I did notice an improvement in the ride. Perhaps it wasn't anything to do with the sensor readings but simply the reduction in unwanted vertical displacement.

 

[MikeAMG]

Guys

Where did you get your rubber to make the spacer?

Ta

 

[lexman8]

Where did you get your rubber to make the spacer?

RUBBER SHEET VARIOUS SIZES X 1MM TO 25MM THICKNESS AVAILABLE | eBay

I bought a sheet 200mm x 200mm. Measure your gap to see what thickness you'll need. My gap was ~9mm so bought 8mm. This was perfect on one of the struts but the other gap was slightly bigger so the fit isn't as tight. However, it stays in place okay and does the job.

btw, this fix is very easy on the front struts but difficult/impossible on the rears. As it happens, it tends to be the fronts that give the bigger problem anyway.

 

[MikeAMG]

RUBBER SHEET VARIOUS SIZES X 1MM TO 25MM THICKNESS AVAILABLE | eBay

I bought a sheet 200mm x 200mm. Measure your gap to see what thickness you'll need. My gap was ~9mm so bought 8mm. This was perfect on one of the struts but the other gap was slightly bigger so the fit isn't as tight. However, it stays in place okay and does the job.

btw, this fix is very easy on the front struts but difficult/impossible on the rears. As it happens, it tends to be the fronts that give the bigger problem anyway.

Thank you. Mine haven't completely separated but getting close.

 

[MikeAMG]

The latter measures the position of the plunger relative to what is essentially the shock absorber tube so has no point of reference to the car's chassis hence changes to the top mount will have no effect on its readings.

But the ECU will be getting a signal change from the level sensor so will expect a relative signal change from the plunger. Without, it will be 'confused'.

 

[911mani]

Hi guys I have changed the front suspension on car and the ABC fault lights keep coming on. At present the car is parked up with the passenger side dipped really low and the drivers side front somewhat normal height. This was in reverse the other day. Did a full power reset on the car and it levelled out, but with the fault light still on. I have been advised that this could be one of two possible faults. Both located in the passenger side wheel arch. ABC sphere module with a valve and another valve sensor. Not sure of the correct terminology. Can anyone please advise.


Kind regards

911.

 

[Borys]

Rodeo would be advisable after suspension work to bleed the system properly
If car sinks on one side it means valve block is at fault. 4 solenoids there, two big ones which let the oil to the shock and two small ones letting the oil to go back to reservoir. If one of the small ones is sticky or faulty (seal broken) that will happen

 

[911mani]

Hi Borys

Thanks for your response. Much appreciated

In the process of jacking up the car some air came out of the ABC reservoir. Is that normal or am I to expect the worse.

Thanks in advance

911.

 

[lexman8]

Is the car sitting normally on both sides now?

 

[911mani]

Lexman8

Disconnected the battery for one hour for the system to reset. After reconnecting the battery I had no joy.
Drove the car last night and the ABC reset itself looks all level on both sides and luckily no leaks. ABC switch is working, goes up and down like normal.

Thanks all for your support

911.