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Rear Rearward Upper Link Replacement
 
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Pelican Technical Article:

Rear Rearward Upper Link Replacement

Kerry Jonsson

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

12mm twelve point socket bit, T55 internal Torx socket, 18mm wrench and/or socket with ratchet

Applicable Models:

Mercedes-Benz W211 (2003-09)

Parts Required:

Rear rearward upper link

Hot Tip:

Spray the fasteners with penetrating oil before removing

Performance Gain:

Improve handling and uneven tire wear

Complementary Modification:

Replace the tires if you have uneven tire wear

Mercedes Benz uses a multiple link suspension on their W211 chassis. Using multiple links to suspend the spindle from the frame of the car helps control the relative position of the spindle to the road as the suspension moves through its travel. Controlling the angle of the spindle to the road is what gives Mercedes Benz the stable high speed handling they are known for. The rear rearward upper link controls the position of the top of the spindle as the suspension moves up and down. Unlike the front suspension that needs ball joints for flexibility during steering and suspension movement the rear suspension only has to deal with suspension movement. Mercedes Benz uses rubber bushings in all of their rear suspension links. As with any rubber part, over time it may dry out and crack as the bushings are exposed to road salts and the environment. When the bushings in the rear rearward upper link are worn they allow the top of the spindle to move around while the car is cornering. This causes unusual handling characteristics and uneven tire wear. In this tech article we will go over all the steps to replace the rear rearward upper link.

Before you work under your car, make sure to wear safety glasses. Getting rust particles in your eyes is no fun. Lift and support the rear axle of the vehicle. You have to remove the tires to perform this job and it does make access much easier since you may not have access to an automotive lift. See our tech article on jacking and supporting your vehicle and removing the rear tires.

The procedure to replace the rear rearward upper link is the same for both the left and right side. In these pictures we are working on the right side. Keep in mind all the steps apply to both sides. It is recommended you replace both sides at the same time to keep your handling neutral.

Remember your car may have been serviced before and had parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches

This picture illustrates a top view of the spindle mounted in the right side rear wheel well.
Figure 1

This picture illustrates a top view of the spindle mounted in the right side rear wheel well. Remove the 18mm fastener (green arrow) and the T55 external Torx fastener (red arrow). You do not need to remove the brake caliper and rotor as we have done here. We have done so to enable you to better see what weÂ're doing.

These fasteners are tight so use a breaker bar to get leverage on the fasteners.
Figure 2

These fasteners are tight so use a breaker bar to get leverage on the fasteners.

Remove the fastener from the rear rearward upper link spindle mount by moving it in the direction of the blue arrow.
Figure 3

Remove the fastener from the rear rearward upper link spindle mount by moving it in the direction of the blue arrow.

Using a 12mm twelve point socket hold one side of the fastener (green arrow) and loosen the other side of the fastener with a 18mm wrench (red arrow).
Figure 4

Using a 12mm twelve point socket hold one side of the fastener (green arrow) and loosen the other side of the fastener with a 18mm wrench (red arrow).

Pull out the fastener by moving it in the direction of the blue arrow.
Figure 5

Pull out the fastener by moving it in the direction of the blue arrow.

Pull the arm out of the sub frame mount and remove it from the car.
Figure 6

Pull the arm out of the sub frame mount and remove it from the car. Installation is the reverse of the removal procedures. Install the link in the sub frame mount, install the fastener and leave it a little loose. Line up the rear rearward upper link spindle mount with the spindle and install the fasteners. Tighten down all fasteners and install the wheel.

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