Quite note when replacing ABC Hoses with custom rebuilds (Thermoplastic Fiber)
Thread Starter
Super Member
Joined: Dec 2007
Posts: 980
Likes: 224
2005 S500 Designo
Quite note when replacing ABC Hoses with custom rebuilds (Thermoplastic Fiber)
I just got done replacing a number of hoses in the ABC system.
The particular hose that broke goes off the pump and into nothing: thus supposedly acting as an accumulator. The hose is NOT a traditional steel braided rubber hose but is instead a fiber hose with a plastic center. I found this unusual as other hoses in the system are traditional steel braided rubber, however upon doing further research I found fiber reinforced hoses with a plastic core can act as accumulators/pulsation dampeners.
Here is a white paper on the subject.
https://www.parker.com/content/dam/P...hite_paper.pdf
And more links:
https://www.powermotiontech.com/hydr...et-things-down
It appears this is exactly what mercedes did for their 2002-2006 iterations of the m275, and know for a fact that's what Mercedes did for the hose that comes off the pump and appears to go nowhere.
Installation of an accumulator might be an alternative solution.
The particular hose that broke goes off the pump and into nothing: thus supposedly acting as an accumulator. The hose is NOT a traditional steel braided rubber hose but is instead a fiber hose with a plastic center. I found this unusual as other hoses in the system are traditional steel braided rubber, however upon doing further research I found fiber reinforced hoses with a plastic core can act as accumulators/pulsation dampeners.
Here is a white paper on the subject.
https://www.parker.com/content/dam/P...hite_paper.pdf
And more links:
https://www.powermotiontech.com/hydr...et-things-down
It appears this is exactly what mercedes did for their 2002-2006 iterations of the m275, and know for a fact that's what Mercedes did for the hose that comes off the pump and appears to go nowhere.
Installation of an accumulator might be an alternative solution.
Last edited by Fried Chicken; Oct 18, 2024 at 03:12 PM.
Thread Starter
Super Member
Joined: Dec 2007
Posts: 980
Likes: 224
2005 S500 Designo
I'd like to provide an addendum to this:
Images of the cut original hose (that exploded), and the new thermoplastic fiber hose my hydraulic shop made for me:
https://postimg.cc/sB0FNVS4
https://postimg.cc/gXX99fHF
Images of the cut original hose (that exploded), and the new thermoplastic fiber hose my hydraulic shop made for me:
https://postimg.cc/sB0FNVS4
https://postimg.cc/gXX99fHF
MBWorld Fanatic!
Joined: Feb 2012
Posts: 2,623
Likes: 1,216
From: Phoenix
222 S-65
Want to make a real improvement? Run a hose to an accumulator. This will quiet down the pump... Though it will need to be one of small volume as all pressurized oil will return to the reservoir once the engine is turned off. Look to what MB did for 221 and 222 cars as a guide.
