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Power Steering Fill and Bleed
 
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Pelican Technical Article:

Power Steering Fill and Bleed

Steve Vernon

Time:

1 hour1 hr

Tab:

$15 to $40

Talent:

*

Tools:

An assistant

Applicable Models:

Mercedes-Benz C300 (2013-14)
Mercedes-Benz C350 (2006-15)
Mercedes-Benz CLK350 (2006-09)
Mercedes-Benz E350 (2006-15)
Mercedes-Benz E400 (2013-15)
Mercedes-Benz GLK350 (2010-15)
Mercedes-Benz ML350 (2006-15)
Mercedes-Benz ML450 (2010-11)
Mercedes-Benz R350 (2006-12)
Mercedes-Benz S400 (2010-13)
Mercedes-Benz SLK350 (2005-16)

Parts Required:

Power steering fluid

Hot Tip:

Keep everything really clean

Performance Gain:

Proper steering

Complementary Modification:

Change cabin air filter

Along with dirt, air can be a big problem in your Mercedes power steering system. Getting air into the system can cause foaming, and getting air into the rack can lead to it not functioning correctly, failure and an eventual replacement or rebuild. Therefore it is critical that when you are filling the system you follow the proper procedures to avoid any problems.

These procedures are only for filling the system after the installation of a new reservoir or pump. These steps also need to be followed if you have let the fluid get below the level of the hoses and potentially introduced air into the system. You do not need to follow these procedures if you are just topping up the reservoir.

Begin by working on a cool depressurized system. Do not start the engine until instructed. Starting the engine too soon runs the risk of introducing air into the system.

The power steering pump and reservoir are located at the left front of the motor (red arrow).
Figure 1

The power steering pump and reservoir are located at the left front of the motor (red arrow). Chances are if you are reading this article you have replaced the pump or reservoir and have already removed most of these components. While you do not need to remove anything to just top up the fluid it is easier to get a few simple things out of the way when filling and bleeding. Remove the front engine cover (yellow arrow) by pulling it straight up and off from the center of the piece. Remove the left air duct by compressing it off the air filter housing and then slipping it off the duct (green arrow).

Make sure to carefully clean around the cap and reservoir (red arrow).
Figure 2

Make sure to carefully clean around the cap and reservoir (red arrow). Introducing dirt into the system is as bad as getting air in.

Always use the correct fluid for your system.
Figure 3

Always use the correct fluid for your system.

Fill the reservoir until the level is approximately 10mm below the upper edge (red arrow).
Figure 4

Fill the reservoir until the level is approximately 10mm below the upper edge (red arrow).

Do NOT start the engine yet.
Figure 5

Do NOT start the engine yet. Starting the engine has the potential to introduce air into the system, and you do not want that!

Turn the steering wheel slowly from steering stop to steering stop until no bubbles appear in the reservoir.
Figure 6

Turn the steering wheel slowly from steering stop to steering stop until no bubbles appear in the reservoir. As the fluid works its way into the hoses and rack have your assistant continue to add power steering fluid. Do not let the level get low. Turn the wheel slowly at least thirty times in each direction from stop to stop (red and yellow arrows).

Remember to keep checking the level (red arrow)! When you first start turning the wheel your assistant should be continuously pouring fluid in as the fluid moves from the reservoir to the hoses and rack.
Figure 7

Remember to keep checking the level (red arrow)! When you first start turning the wheel your assistant should be continuously pouring fluid in as the fluid moves from the reservoir to the hoses and rack.

Start the motor but do not touch the steering wheel.
Figure 8

Start the motor but do not touch the steering wheel. You should have your assistant watching the level as the motor is starting and adding fluid to make sure the reservoir does not get low.

With the engine running slowly turn the steering wheel several times from stop to stop while your assistant adds fluid as needed.
Figure 9

With the engine running slowly turn the steering wheel several times from stop to stop while your assistant adds fluid as needed. Repeat this procedure until the level in the reservoir remains constant and no bubbles are visible.

Check for leaks then then top up the reservoir until it is at the proper fill level on the dipstick in the cap (red arrow).
Figure 10

Check for leaks then then top up the reservoir until it is at the proper fill level on the dipstick in the cap (red arrow).


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Comments and Suggestions:
mithsme Comments: Does the car has to be lifted and the front wheels away from the ground ?
June 21, 2016
  Followup from the Pelican Staff: No. - Nick at Pelican Parts  

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