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Hotline Archive: ABC suspension leaks down more than 10mm overnight.NO external leaks
Having access to the biggest USA workshop live hotline databases, I will publish them here and might help some.
Customer Concern: ABC suspension leaks down more than 10mm overnight. There is NO external leakage.
Average Reported Mileage: 101260
Diagnostic Codes
C1525
C1526
C1531
Tests/Procedures:
1. Run car and inspect for correct fluid level for hydraulic suspension. With vehicle level at the "Normal" ride height, the fluid should show between the MIN and MAX marks for ENGINE ON UNLADEN.
2. Perform factory operations to flush and filter the suspension hydraulic system. Complete Procedure available by fax but factory scan tool is needed.
a. Clean oil reservoir completely!
b. Filter ABC system. Include 1/2 hour for Rodeo.
c. Raise with scan tool and bleed oil from struts.
d. Repeat steps 3 and 4 three times.
3. If vehicle still leaks down, then replacement of front and or rear valve blocks may be needed.
4. Read service bulletin LI32.50-P-046012 and LI32.50-P-044994. All work operations are labeled in the bulletins. Tech Tips: If a vehicle lowers after being stationary (engine off) within approximately one week, this is likely due to internal leakage in the check valve of the front (Y36/1) or rear (Y36/2) axle valve blocks. The internal leakage is the result of deposits or contamination on the valve seat of the check valve. In order to remove the deposits, filter the ABC system.
Potential Causes
Air In Hydraulics
Hydraulic Suspension System Bleed Procedure
Hydraulic Valve Block
Confirmed Fix Summary
Confirmed Fix
1 - Performed Tests/Procedures/Tech Tips In Hotline Archive
9 - Replaced Front Axle Valve Block Y36/1
7 - Replaced Rear Axle Valve Block Y36/2
4 - Replaced Front Axle Valve Block Y36/1 and Performed Hydraulic Suspension System Bleed Procedure and Replaced Rear Axle Valve Block Y36/2
3 - Replaced Front Axle Valve Block Y36/1 and Replaced Rear Axle Valve Block Y36/2
3 - Replaced Active Body Control (ABC) Suspension Strut
2 - Performed Hydraulic Suspension System Bleed Procedure
1 - Installed Coil Spring Conversion Kit
1 - Replaced Active Body Control Pump
April 27, 2016 2002 Mercedes-Benz SL500, 5.0L, V8, Des 113.961, USA *
Front Axle Valve Block Y36/1
- this is the second mercedes in now with exact same symtom of rising and lowering on its own while sitting at a light with no external leakage.
Replaced Front Axle Valve Block Y36/1
June 15, 2017 2002 Mercedes-Benz CL600, 5.8L, V12, SOHC, USA *
Front Axle Valve Block Y36/1 Replaced Front Axle Valve Block Y36/1
May 3, 2017 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Front Axle Valve Block Y36/1 Replaced Front Axle Valve Block Y36/1
December 17, 2015 2004 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Front Axle Valve Block Y36/1 Replaced Front Axle Valve Block Y36/1
September 28, 2015 2002 Mercedes-Benz CL600, 5.8L, V12, SOHC, USA *
Front Axle Valve Block Y36/1
89,544 miles Replaced Front Axle Valve Block Y36/1
September 22, 2015 2004 Mercedes-Benz CL500, 5.0L, V8, Des 113.960, USA *
Front Axle Valve Block Y36/1
88,000 miles Replaced Front Axle Valve Block Y36/1
April 21, 2015 2002 Mercedes-Benz CL500, 5.0L, V8, Des 113.960, USA *
Front Axle Valve Block Y36/1
160,458 miles Replaced Front Axle Valve Block Y36/1
July 24, 2013 2003 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Front Axle Valve Block Y36/1 Replaced Front Axle Valve Block Y36/1
May 4, 2011 2001 Mercedes-Benz S500, Guard 5.0L, V8, Des 113.960, USA *
Front Axle Valve Block Y36/1
- Had an internal system leak causing the tank to overflow. Did a system flush and replaced the front valve block.
86,500 miles Replaced Front Axle Valve Block Y36/1
March 30, 2017 2000 Mercedes-Benz CL500, 5.0L, V8, USA *
Rear Axle Valve Block Y36/2
- The left rear wheel would be on the wheel arch in the morning. Replaced valve block
Replaced Rear Axle Valve Block Y36/2
November 27, 2019 2001 Mercedes-Benz CL600, 5.8L, V12, SOHC, USA *
Rear Axle Valve Block Y36/2
- Rear of car was leaking down overnight
June 12, 2014 2003 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Rear Axle Valve Block Y36/2
120,000 miles Replaced Rear Axle Valve Block Y36/2
April 29, 2014 2003 Mercedes-Benz S55 AMG, Kompressor 5.5L, V8, USA *
Front Axle Valve Block Y36/1
Hydraulic Suspension System Bleed Procedure
Rear Axle Valve Block Y36/2
- Perform rodeo, check fluid level and condition, found that the front and rear axle valve blocks are leaking. replace and flush system, bleed. System works and holds ride height.
Replaced Front Axle Valve Block Y36/1 and Performed Hydraulic Suspension System Bleed Procedure and Replaced Rear Axle Valve Block Y36/2
May 2, 2016 2002 Mercedes-Benz CL500, 5.0L, V8, Des 113.960, USA *
Front Axle Valve Block Y36/1
Hydraulic Suspension System Bleed Procedure
Rear Axle Valve Block Y36/2 Replaced Front Axle Valve Block Y36/1 and Performed Hydraulic Suspension System Bleed Procedure and Replaced Rear Axle Valve Block Y36/2
August 31, 2010 2002 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Front Axle Valve Block Y36/1
Hydraulic Suspension System Bleed Procedure
Rear Axle Valve Block Y36/2
98,000 miles Replaced Front Axle Valve Block Y36/1 and Performed Hydraulic Suspension System Bleed Procedure and Replaced Rear Axle Valve Block Y36/2
February 4, 2010 2002 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Front Axle Valve Block Y36/1
Hydraulic Suspension System Bleed Procedure
Rear Axle Valve Block Y36/2
96,678 miles Replaced Front Axle Valve Block Y36/1 and Performed Hydraulic Suspension System Bleed Procedure and Replaced Rear Axle Valve Block Y36/2
January 31, 2019 2004 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Active Body Control (ABC) Suspension Strut Replaced Active Body Control (ABC) Suspension Strut
January 13, 2019 2001 Mercedes-Benz CL600, 5.8L, V12, SOHC, USA *
Active Body Control (ABC) Suspension Strut Replaced Active Body Control (ABC) Suspension Strut
February 22, 2016 2005 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Active Body Control (ABC) Suspension Strut Replaced Active Body Control (ABC) Suspension Strut
December 3, 2019 2001 Mercedes-Benz CL600, 5.8L, V12, SOHC, USA *
Front Axle Valve Block Y36/1
Rear Axle Valve Block Y36/2
85,124 miles Replaced Front Axle Valve Block Y36/1 and Replaced Rear Axle Valve Block Y36/2
May 12, 2016 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Front Axle Valve Block Y36/1
Rear Axle Valve Block Y36/2 Replaced Front Axle Valve Block Y36/1 and Replaced Rear Axle Valve Block Y36/2
April 17, 2014 2004 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Front Axle Valve Block Y36/1
Rear Axle Valve Block Y36/2
124,000 miles Replaced Front Axle Valve Block Y36/1 and Replaced Rear Axle Valve Block Y36/2
December 24, 2019 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Hydraulic Suspension System Bleed Procedure Performed Hydraulic Suspension System Bleed Procedure
March 13, 2017 2002 Mercedes-Benz CL500, 5.0L, V8, Des 113.960, USA *
Hydraulic Suspension System Bleed Procedure Performed Hydraulic Suspension System Bleed Procedure
February 25, 2011 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Active Body Control Pump
- found the abc pump to be leaking.
Replaced Active Body Control Pump
October 13, 2016 2003 Mercedes-Benz CL55 AMG, 5.5L, V8, USA *
Coil Spring Conversion Kit
- Customer did not want to spend the money on valve block so we replaced Hydraulics with Strut Masters Coil Spring conversion kit. Rides good but ABC light remains on
Installed Coil Spring Conversion Kit
February 8, 2017 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Tests/Procedures/Tech Tips In Hotline Archive
When the car starts, the height is normal after about 40 seconds Of idle. When driving, the red ABC warning comes across the dash Within about 300 Yards. The car is still at the correct height.
When the car is shut off, the ABC go to max height on all 4 corners. It shoots up pretty quick, so the system has good pressure throughout. The pump is putting between 180 and 190 bar of pressure. There are no leaks.
Going to try a pressure sensor and used ABC controller to see if that fixes it. I’m just going to start throwing parts at the problem unless anyone has any ideas.
The car has all new accumulators (3) and new pulsation damper. Both valve blocks have been completely rebuilt.
The height button inside the car works perfectly.
The struts appear to be strong.
The car will go through the full rodeo test.
What am I missing? This problem is on all 4 points of the car.
05-19-2020, 04:10 AM
Hotline Archive: ABC suspension leaks down more than 10mm overnight.NO external leaks
