SL/R230: ABC still sagging after valve block rebuild
Thread Starter
Junior Member
Joined: Feb 2020
Posts: 69
Likes: 8
From: Westchester, New York
2004 SL55 AMG, 2019 Range Rover Sport SVR
ABC still sagging after valve block rebuild
Hello,
Recently picked up an 04 SL55 w/ 50k miles. The car would drop overnight after several hours, starting in the front left corner and then the rear left would drop. The right side will stay up altogether no matter how long. I rebuilt the front valve block using the upgraded seals everyone speaks of, but now it seems that the pressure leak is worse. After shutting the car off, the front left corner is completely slammed down after only about an hour and the rear left follows shortly after. Is there something I could have missed while doing the rebuild? Or should I begin to look in other areas for the problem? I’m very confused. Any help would be appreciated. Thank you.
Recently picked up an 04 SL55 w/ 50k miles. The car would drop overnight after several hours, starting in the front left corner and then the rear left would drop. The right side will stay up altogether no matter how long. I rebuilt the front valve block using the upgraded seals everyone speaks of, but now it seems that the pressure leak is worse. After shutting the car off, the front left corner is completely slammed down after only about an hour and the rear left follows shortly after. Is there something I could have missed while doing the rebuild? Or should I begin to look in other areas for the problem? I’m very confused. Any help would be appreciated. Thank you.
Senior Member
Joined: May 2020
Posts: 444
Likes: 55
From: North Carolina, USA
2004 SL500AMG, 2003 SL500 USA
On my 3 SL500s - 2003&4 I had front and rear valves rebuilt, replaced 2 accumulators with new ones, replaced the 2 pulsation dampener air chambers, filter, fluid on all 3. Obviously, I would do all of that on your 22 year old hydraulic system. Replaced 2 hydraulic tandem pumps, 6 or 7 hydraulic hoses. There is a guide to ABC hydraulic systems in Benzbits or at the top of this forum I think that goes into what causes what symptoms.
