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ABC Hydraulic struts not working properly

Tiny
RAMZITH1
  • MEMBER
  • 2001 MERCEDES BENZ S600
  • 0.6L
  • V12
  • 2WD
  • AUTOMATIC
  • 165 MILES
Hi,

One year ago I have changed the ABC hydraulic struts to normal one, nothing else been changed and it was something worse, again I returned back the ABC Hydraulic and checked for any leak but seems everything is okay.

Now the car is raising up in full but when I switch off the hydraulic the car comes down front in full with the warning red light comes on, the back side remains up in full, changed the oil but still the same.

If I drive the car with the switch on for test the car front raise up but for few yards again front comes down while driving and when I stop the car, front raise up itself, this happen while driving repeatedly.

Looking for suggestions from your side please.

Thanking you for your usual support.

Best regards,

RAMZI
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Wednesday, February 5th, 2020 AT 7:04 AM

4 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
You have an internal leak in the system. Basically the circuit to the front struts has a leak somewhere in it that allows pressure to bleed back to the reservoir.

More than likely the issue is the control unit that is part of the pump/compressor. This is what directs the fluid to each strut. The fact that the front goes down evenly and there are no external leaks then that means it is not a single strut or line. It has to be something that both have in common and this is the control unit.

Look over this material and let me know if you have questions. Thanks
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Wednesday, February 5th, 2020 AT 3:56 PM
Tiny
RAMZITH1
  • MEMBER
  • 70 POSTS
Dear KASEKENNY1,

Thanks, will check and report back.

Ramzi
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Thursday, February 6th, 2020 AT 2:54 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Thanks. Please let us know what you find. Thanks
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Friday, February 7th, 2020 AT 2:56 PM
Tiny
RAMZITH1
  • MEMBER
  • 70 POSTS
Hi,

I have replaced the control unit with a used one but the issue is still, rear side is still not coming down and the front still raising up with the switch on, but when driving comes down as I explained in my previous message, I am trying to replace the valves seals now both front and rear.
Will keep you posted.

Thanks
Ramzi
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Saturday, February 8th, 2020 AT 5:18 AM

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