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Pelican Technical Article:

Rear Shock Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$150 to $500

Talent:

**

Tools:

E14 Torx socket, 16mm, 13mm wrench

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Shocks

Hot Tip:

Loosen your wheels before lifting the car

Performance Gain:

Better handling

Complementary Modification:

New front struts

Your shocks are a very important part of your car's suspension system and see a lot of wear and tear over the years. If your car is starting to handle poorly, it may be the shocks going bad. I recommend that you replace your shocks every five to seven years - 50,000 miles or so, or when they start to feel weak or worn out. Different driving patterns may also affect the life of struts and shock absorbers. Cars that are raced or driven hard on windy roads may need to have their shocks replaced more often than typical street cars. It is important to remember if you install performance springs on your car that raise or lower it from its stock level, you will need to have the car realigned and install shocks and struts that are designed to work with the shorter springs. Changing the height of the suspension changes the values of the suspension settings. Look under the car and see if the shocks are leaking or the bushings are wearing out. Both are signs that the shocks need to, or are going to need to be replaced soon. Remember to always replace your shocks in pairs.

Changing the shocks on a W204 is easy. First safely raise and support the rear of the car and remove the rear wheels; please see our article on this procedures for additional assistance.

Begin by removing all of the fasteners for the rear wheel well liner and remove the liner; please see our article on wheel well liner removal for additional assistance.
Figure 1

Begin by removing all of the fasteners for the rear wheel well liner and remove the liner; please see our article on wheel well liner removal for additional assistance.

There are two nuts and bolts sticking out from the end of the swing control arm, DO NOT remove these, they are for the wheel carrier (yellow arrow) and the sway bar drop link (red arrow).
Figure 2

There are two nuts and bolts sticking out from the end of the swing control arm, DO NOT remove these, they are for the wheel carrier (yellow arrow) and the sway bar drop link (red arrow). The shock mount is under the plastic protective piece on the arm (blue arrow).

Squeeze in the four plastic tabs (red arrows) and remove the plastic cover from below.
Figure 3

Squeeze in the four plastic tabs (red arrows) and remove the plastic cover from below.

Support the arm by placing a floor jack under the wheel carrier (red arrow).
Figure 4

Support the arm by placing a floor jack under the wheel carrier (red arrow). The spring is still under pressure and you do not want to take any risks. You can now use an E14 socket and a 16mm wrench to loosen and remove the nut and bolt holding the shock top the control arm (yellow arrow).

Open the trunk, remove the lower carpet and then remove the fasteners on the side panels.
Figure 5

Open the trunk, remove the lower carpet and then remove the fasteners on the side panels. Please see our article on trunk trim removal for further assistance.

Fold the trim piece back and remove the two 13mm nuts from the top of the shock mount (red arrows).
Figure 6

Fold the trim piece back and remove the two 13mm nuts from the top of the shock mount (red arrows).

Go back to the wheel area and compress the shock downward (red arrow) until the top of the mount clears the metal and then remove the shock from the vehicle.
Figure 7

Go back to the wheel area and compress the shock downward (red arrow) until the top of the mount clears the metal and then remove the shock from the vehicle. Installation is the reverse of removal and try compressing the shock a few times before installing it to get the fluid moving and make compressing it in the vehicle easier.


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