Originally Posted by BWhitmore

Tom Hanson, Parts Manager at the Mercedes Classic Center in Irvine, told me years ago that the SLS shocks hardly ever fail or leak. The test for a bad accumulator is to remove the metal tubing and using the eraser end of a pencil insert the eraser end into the accumulator gently. You should feel light resistance. If no resistance, the diaphragm inside the accumulator is torn or ruptured. The SLS height control valve can leak both internally and externally. Kits (consisting of O rings) are available to rebuild the height control valve. The bleeder valve on the height control valve is normally capped with a black rubber cap to prevent dirt from entering.