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Brake Light Switch Replacement
 
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Pelican Technical Article:

Brake Light Switch Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$15 to $20

Talent:

**

Tools:

T20 Torx, Philips and flathead screwdriver

Applicable Models:

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

Parts Required:

Brake light switch

Hot Tip:

Get comfortable, it's a tight fit

Performance Gain:

Working brake lights

Complementary Modification:

Check your brake light bulbs

If your brake lights are failing to come on when you depress the brake pedal there is a good chance the brake light switch has failed. The switch is located underneath the driver side dash just in front of the brake pedal arm. It is a very tight fit under the dash so before you begin do yourself a favor and move the driver seat all the way to the rear.

To change the brake light switch you must first remove the under dash panel or kick panel.
Figure 1

To change the brake light switch you must first remove the under dash panel or kick panel. In the older Mercedes you did not need to fully remove the kick panel, on the W204 you need too. Begin by using a T20 Torx and remove the three screws along the front of the kick panel (red arrows). You will also need to remove the hood release from the panel (yellow arrow).

While holding the handle for the hood release in the open position use a small Philips head screwdriver and remove the single screw under the handle (yellow arrow).
Figure 2

While holding the handle for the hood release in the open position use a small Philips head screwdriver and remove the single screw under the handle (yellow arrow).

Lower the panel down and pull the clip forward on the OBD2 connection (red arrow) and then separate the connection (yellow arrow) from the housing in the lick panel.
Figure 3

Lower the panel down and pull the clip forward on the OBD2 connection (red arrow) and then separate the connection (yellow arrow) from the housing in the lick panel.

Dropping the panel further down you can separate the two other wiring connections (green arrows) and push the handle for the hood release (yellow arrow) up and out of the port in the panel (red arrow).
Figure 4

Dropping the panel further down you can separate the two other wiring connections (green arrows) and push the handle for the hood release (yellow arrow) up and out of the port in the panel (red arrow).

The switch is located up under the dash (red arrow) just in front of the brake pedal.
Figure 5

The switch is located up under the dash (red arrow) just in front of the brake pedal.

Pull the wiring connection out from the bottom of the switch (red arrow) and then pull the grey section of the switch straight back and out (yellow arrow).
Figure 6

Pull the wiring connection out from the bottom of the switch (red arrow) and then pull the grey section of the switch straight back and out (yellow arrow).

There is a cover over the switch and brake pedal assembly that you need to remove to access the tabs on the back of the switch.
Figure 7

There is a cover over the switch and brake pedal assembly that you need to remove to access the tabs on the back of the switch. There are four plastic tabs that hold the cover in place (red arrows). You can use a flathead screwdriver to release the clips.

With the cover off you can see the area where you need to release the four clips (red arrows).
Figure 8

With the cover off you can see the area where you need to release the four clips (red arrows).

This is what the switch looks like out of the assembly.
Figure 9

This is what the switch looks like out of the assembly. With the gray section removed you reach around the back of the switch and squeeze in the tabs on the top and bottom of the white section (red arrows). When installing the new switch depress the brake pedal and insert the switch into the bracket. Press the switch all the way in. Release the brake pedal and slightly pull back on it. Installation of the rest of the components is the reverse of removal.


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Comments and Suggestions:
Shawn Comments: Thank you for this post ... Very helpful!!
October 14, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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