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Home >> Mercedes Benz >> 2010 >> SL550 >> Repair and Diagnosis >> Suspension >> Rear Suspension >> Suspension - 230 Chassis >> Testing & Repair >> Remove/install rear axle valve unit - AR32.50-P-0002 >> Remove/install rear axle valve unit - AR32.50-P-0002RX (SL550, SL55AMG 2007-2008, SL63 AMG, SL600 2007-2009, SL65 2006-2011)

Remove/install rear axle valve unit - AR32.50-P-0002RX (SL550, SL55AMG 2007-2008, SL63 AMG, SL600 2007-2009, SL65 2006-2011)

MODEL 230.470 /471 /472 /477 

MODEL 230.479 as of model year 2006 

Fig 1: Removing/Installing Rear Axle Valve Unit
G00544319Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install    
NOTES Notes on fitting hydraulic lines and hoses   AH32.50-P-0001-02A 
    NOTES Before opening the hydraulic system the area surrounding the separation point should be cleaned thoroughly. Even the smallest dirt particles, introduced into the hydraulic components, can lead to malfunctions and a total failure of the hydraulic system.
IMPORTANT Notes on Active Body Control suspension   AH32.50-P-0001-01N 
1 Detach left rear wheel    
Remove/install wheels     AP40.10-P-4050Z
2 Remove fender liner in the rear left fender   AR88.10-P-1400R
3 Relieve pressure in the rear axle ABC system   AR32.50-P-0001-01N 
    TORQUE SPECIFICATION *BA32.50-P-1001-02B 
4 Remove bolts (2) and remove hydraulic lines (2a) Ensure that no dirt gets into the opened hydraulic lines (2a) as this can lead to the failure of the ABC system.  
    TORQUE SPECIFICATION *BA32.50-P-1022-01A 
5 Separate hydraulic lines (8) using release tool on quick-release couplings (7) Ensure that no dirt gets into the open quick-release couplings (7) as this can lead to the failure of the ABC system.  
    SPECIAL TOOL Fig 3
    SPECIAL TOOL Fig 2
    Observe different cross-sections of the quick-release couplings (7).
Installation:  Ensure that the quick-release couplings (7) latch completely.
Installation:  The hydraulic lines (8) and quick-release couplings (7) are color coded and must not be transposed.
 
6 Detach retaining clamp (6) and separate cable ties (5)    
7 Slacken nut (1)    
8 Pull rear axle ABC valve unit (Y36/2) backwards slightly and detach electrical connectors (4) Only pull the rear axle ABC valve unit (Y36/2) back until the electrical connectors (4) are accessible
Before detaching the electrical connectors (4), check whether the color coding on the rear axle ABC valve unit (Y36/2) and the electrical connectors (4) are present. Otherwise, if incorrectly mounted, the rear axle ABC valve unit (Y36/2) may be destroyed or malfunction.
Warning: Risk of accident! 
Installation:  The electrical plugs and connections on the rear axle ABC valve unit (Y36/2) are color coded relative to each other, and they must not be mixed up.
 
9 Remove rear axle ABC valve unit (Y36/2) to the rear    
10 Detach hydraulic lines (8) from rear axle ABC valve unit (Y36/2) When replacing rear axle ABC valve unit (Y36/2)
Installation:  Check sealing rings for damage and replace if necessary. Check support rings for damage and replace the complete hydraulic line (8) if necessary.
 
    TORQUE SPECIFICATION *BA32.50-P-1022-01A 
11 Install in the reverse order    
12 Fill and bleed ABC system   AR32.50-P-0021N 
13 Carry out plunger travel calibration using STAR DIAGNOSIS When replacing rear axle ABC valve unit (Y36/2)  
ACTIVE BODY CONTROL, LINES

Number Designation Model 230
BA32.50-P-1001-02B Bleed screw on soldered fitting in hydraulic line M10x1 Nm 20
ACTIVE BODY CONTROL SUSPENSION

Number Designation Model 230
BA32.50-P-1022-01A Bolt, line to rear axle valve unit M8x25 Nm 20
Fig 2: Identifying Detaching Tool (230 589 01 33 00)
G07510559Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Detaching Tool (221 589 01 33 00)
G07510537Courtesy of MERCEDES-BENZ USA