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The self-leveling rear suspension on some W123 models can seem like a bit of a dark art to those who have not had the chance to learn it. Once you know the system, it is not all that difficult to understand or work on. Please see our article on understanding the self-leveling suspension to give you more information on the different components.
One of the main problems with the leveling valve on the rear of the vehicle is that it will over time start to leak and eventually affect the performance of the system. If your leveling valve is leaking or not functioning correctly you do not need to take the car to a dealership that will charge you a fortune to replace or rebuild it. Thanks to Peach Parts member Biodiesel300TD you can follow these step by step instructions to overhaul your own valve.
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Time: 4 hours
Tab: $10
Tools: 17mm, 10mm wrench:www.pelicanpar..., 11mm flared nut wrench:www.pelicanpar..., pick:www.pelicanpar...
Applicable Models: Mercedes-Benz W123 (1977-85):www.pelicanpar...
Parts Required: O-rings:www.pelicanpar..., hydraulic fluid:www.pelicanpar...
Hot Tip: Keep everything really clean
Performance Gain: Working self-leveling suspension
Complementary Modification: Check your CV joints: www.pelicanpar...