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How to Check or Add Brake Fluid Mercedes-Benz 2006-2013 S-Class

Step-by-step procedure on how to check and add brake fluid on a 2006-2013 Mercedes-Benz S550 W221.

ESTIMATED TIME 10 mins
DIY COST $ 7 - 15
DIFFICULTY Very Easy

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What you will need

Procedure

  1. Pull the hood release under the dashboard. Locate the hood latch on the vehicle's front and slide it to the right to unlock it. Open the engine hood and hook it to the engine hood stand. Open the engine hood
  2. Pull the hood up until the hood struts are in hold position.

 

Opened hood of the 2010 Mercedes Benz S550 W221.

 

3. Locate the brake fluid reservoir on the driver side of the engine compartment near the firewall.

The brake fluid reservoir of the 2010 Mercedes Benz S550.

 

4. Check the fluid level on the reservoir; there’s a minimum and max label. Use a light or shake the reservoir a little to determine the fluid level easier. It is important to check the brake fluid level to prevent air bubbles from the brake lines and poor braking performance. Bleeding the brakes also eliminates air bubbles.

Checking the brake fluid level of the vehicle.

 

5. If the brake fluid is at the minimum level, open the cap by turning it counterclockwise.

Removing the brake fluid cap.

 

6. Pour in the Brake Fluid (DOT 4+)Make sure that the brake fluid is from a sealed and unopened container. 

Pouring the brake fluid in.

 

7. Close the cap by turning it clockwise. After the top-up of brake fluid, observe if it reaches the minimum level again in the brake fluid reservoir; If this occurs, there could be a possible brake leak. Inspect brake lines and hoses condition, inspect the condition of brake caliper seals kit, and replace the old ones if needed. 

Closing the brake fluid cap.

 

Notes

  • The recommended brake fluid type is also listed in your owner's manual. 
  • The recommended brake fluid type is also noted on the top of the cap for the brake fluid reservoir.
  • Do not allow the brake fluid to spill on the paint of the vehicle. If brake fluid gets on the paint, wash it off with water. Brake fluid can damage the paint. 
  • Note that a brake light staying on at startup can indicate a problem with the brake system, but it can be an issue with the charging system or battery in some cases.
  • You should not lose brake fluid regularly. If you are losing brake fluid, have the brake system checked by a mechanic immediately. 
  • If your brake warning light (or ABS light) comes on or is flashing while driving or at startup, stop and check the brake fluid level.
  • Driving with the brake light on can put you, your passenger, and others at risk.
How to Check or Add Brake Fluid Mercedes-Benz 2006-2013 S-Class Step-by-step procedure on how to check and add brake fluid on a 2006-2013 Mercedes-Benz S550 W221.