Mercedes-Benz W211 power steering fluid and pressure line
What fluid does the W211 power steering need and how is it changed?
The fluid specification must be MB 345.0. For the change, the return hose is disconnected and the engine is run until the old fluid has drained out, while topping up new fluid into the reservoir evenly. The pump must not run dry. About 1.5 litres of fluid was used.
Does the power steering need bleeding after replacing a hose?
Instructions vary. According to one instruction, the front is lifted into the air and the steering wheel is turned from lock to lock 20-30 times with the engine off, and the fluid level is checked with the dipstick in the reservoir cap. According to another experience, bleeding was not needed. Steering is safety-critical, so have a specialist workshop check the result.
How is a leaking power steering pressure line replaced on a W211?
The lower end of the line is hidden in a tight spot, and the underbody shields are removed so that the line can be fitted. The joint at the upper end has a 17 mm nut. The original part number for the S211 OM648 is A 211 466 08 81. The line A 211 466 06 81 for the OM646 engine is different and does not fit.