SL/R230: Common ABC Problems
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MBWorld Fanatic!
Joined: May 2006
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From: Virginia
W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
Common ABC Problems
Can anyone give me a rundown of the common ABC problems and potential fixes? Is it just the Pump you have to worry about, or do you need to worry about the other components as well? How about the model years, does it matter, are some better than others?
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2017 991.2 Turbo PDK 2017 C63S Coupe Ceramic Brakes 2015 CLS63S AMG Full House
The easiest and cheapest fix, is the expansion hose, yes they do leak at any time, should be checked 1st, before you get a fancy bill from a dealer.
I believe the ABC pump and block valves were changed by 2004.
Member
Joined: Mar 2012
Posts: 119
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2004 SL500 // 2015 S550
Where is the expansion hose located? I thought I had a leak in my valve pressure assembly behind my front left tire. I peeled the wheel well liner back and the assembly was bone dry, and one of the hoses has some oil residue coming down to the bottom of it. It's the hose that goes from the pressure assembly to a fitting just next to the strut. Look fairly straight forward. Did I just get lucky?!
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,108
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From: Dix Hills, New York
2012 C250 Coupe
Where is the expansion hose located? I thought I had a leak in my valve pressure assembly behind my front left tire. I peeled the wheel well liner back and the assembly was bone dry, and one of the hoses has some oil residue coming down to the bottom of it. It's the hose that goes from the pressure assembly to a fitting just next to the strut. Look fairly straight forward. Did I just get lucky?!
Member
Joined: Mar 2012
Posts: 119
Likes: 16
2004 SL500 // 2015 S550
Yes. Had the hose replaced, system flushed and Rodeo test. Local MB parts counter had an exploded view of the system and identified the hose.
