Noisy ABC system, I think.
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Joined: Sep 2016
Posts: 113
Likes: 24
From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
Noisy ABC system, I think.
Hi folks, I had the high pressure expansion hose blow on my car, I was unable to pull over safely and shut down right away. I had my pump rebuilt out of an abundance of caution since it is so difficult to get to. I wound up replacing the HPE hose, the hose to the right front line to the strut and the high pressure line also because of the difficulty of doing this repair. I have it all back together and the system is working fine but there is a loud whirring sound which varies with engine speed. I suspect either air in the system or failed pulsation damper or both. I am wondering if I will do any harm driving it in hopes of working the air out. I have cycled the abc vehicle raise-lower button maybe 10-12 times in hopes of getting the air out. Does anyone have opinions? Thanks!
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Joined: Sep 2016
Posts: 113
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From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
Thanks bobterry99, I have one on order, I just wanted some 2nd opinions. Do you think I will damage anything driving it until the damper comes in?
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SL500-R230
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Joined: Jul 2017
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From: San Juan PR
SL55 CL600 and 335D (rip flood) 325ci
I'm a case study in abuse of abc systems. Run it. Way more robust than you'd think. But it is your money 
btw consider swapping out all the hoses at once. I did one at a time the first three. Then replaced the rest in one shot "while I was in there". Just a piece of mind thing. I got new hoses made from the MB terminals. Cheaper. Working great. What a suspension!
btw consider swapping out all the hoses at once. I did one at a time the first three. Then replaced the rest in one shot "while I was in there". Just a piece of mind thing. I got new hoses made from the MB terminals. Cheaper. Working great. What a suspension!
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Thread Starter
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Joined: Sep 2016
Posts: 113
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From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
Thanks for the reply, I agree with you about the hoses. I had replacements made at a hydraulic shop re-using the MB ends and it worked great, I only did the front ones since they are really hard to get to but I am definitely considering replacing all of the rest at once. After the repair I still had a loud whirring sound so I replaced the Vibration Damper and ran the Rodeo, this greatly reduced the sound but not eliminated it. I never used the bleeder on the right front corner and wonder if I should have. That is the only hose to a strut which was replaced. I figure they put the bleeders there for a reason so that is my next step.
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Joined: Jul 2017
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From: San Juan PR
SL55 CL600 and 335D (rip flood) 325ci
Cool. From what I have read the bleeders are there to reduce the pressure from the system prior to service. I have opened the system a handful of times and just made sure the reservoir had enough fluid. Good luck.
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Joined: Sep 2016
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From: San Diego
2002 CLK 430, 2005 CL600, 2009 Smart Fortwo
It's probably not a bad idea. I had more than one issue. After replacing the hose that burst and getting everything back together I had the loud whirring sound, then I replaced the Vibration damper because they are a service item and only last so long. It helped a lot but I still had noise. After reading many other peoples posts on the subject I thought it may be as simple as a line rubbing the frame, sure enough that's what it was, a metal part of the high pressure line contacting the engine cradle. I had missed a clamp which held it to the block.
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Joined: Feb 2019
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From: Fl
W215
It's probably not a bad idea. I had more than one issue. After replacing the hose that burst and getting everything back together I had the loud whirring sound, then I replaced the Vibration damper because they are a service item and only last so long. It helped a lot but I still had noise. After reading many other peoples posts on the subject I thought it may be as simple as a line rubbing the frame, sure enough that's what it was, a metal part of the high pressure line contacting the engine cradle. I had missed a clamp which held it to the block.
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Joined: Feb 2019
Posts: 97
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From: Fl
W215
The reason is say valve block is because the abc system is closed and in loop when u raise the car the solenoids open and fluid is pushed to the struts. If a solenoid is stuck open while the pump is in operation fluid is being pushed around in the system causing pressure to drop on the lines. Making it seem like the pump is surging - is what I thought was going on - I could be wrong though
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W215
W215 ABC knocking noise
Hi folks, I had the high pressure expansion hose blow on my car, I was unable to pull over safely and shut down right away. I had my pump rebuilt out of an abundance of caution since it is so difficult to get to. I wound up replacing the HPE hose, the hose to the right front line to the strut and the high pressure line also because of the difficulty of doing this repair. I have it all back together and the system is working fine but there is a loud whirring sound which varies with engine speed. I suspect either air in the system or failed pulsation damper or both. I am wondering if I will do any harm driving it in hopes of working the air out. I have cycled the abc vehicle raise-lower button maybe 10-12 times in hopes of getting the air out. Does anyone have opinions? Thanks!
Last edited by Edweirdo310; Mar 23, 2021 at 10:30 PM.
