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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:

$50

Talent:

*

Tools:

Philips head screwdriver

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New brake light switch

Hot Tip:

Remove switch before disconnecting wires

Performance Gain:

Working brake lights

Complementary Modification:

Bleed brakes

If you find you have no brake lights one of the most common solutions to the problem is the brake light switch. These switches fail often and after your fuses should be the first place you check. The switch is quick and easy to replace and can solve a myriad of problems.

You will need to remove the kick panel on the driver side.
Figure 1

You will need to remove the kick panel on the driver side. Begin by removing any carpets including the big heavy foam floor piece (red arrow). Remove the single Philips head screw that holds the kick panel in place (yellow arrow). With the screw removed slide the kick panel towards the pedals and slip the retaining clips out from the lower dash (green arrows).

There is a large plastic screw where the panel meets the floor right under the steering shaft.
Figure 2

There is a large plastic screw where the panel meets the floor right under the steering shaft. Use a Philips head screwdriver and remove this screw (red arrow).

You can now remove the kick panel from the vehicle (red arrow).
Figure 3

You can now remove the kick panel from the vehicle (red arrow).

The brake light switch is located on the brake pedal mounting bracket.
Figure 4

The brake light switch is located on the brake pedal mounting bracket. Squeeze in the tab on the switch (red arrow) and rotate it clockwise 45 degrees. Then pull it straight back and out from the bracket.

It is much easier to disconnect the wires with the switch out of the bracket.
Figure 5

It is much easier to disconnect the wires with the switch out of the bracket. One of the connections pulls straight off (red arrow). The other you have to squeeze in the tabs then pull (yellow arrow).

When installing the new switch attach the wiring before installing the switch in the mount.
Figure 6

When installing the new switch attach the wiring before installing the switch in the mount. When you are ready to install it pull the plunger all the way out (red arrow) before installing. Installation of the kick panel is the reverse of removal.

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Comments and Suggestions:
Gary Comments: Could the brake light switch be bad even if my
Third brake light in window works ?
October 6, 2017
  Followup from the Pelican Staff: What year and model vehicle? - Nick at Pelican Parts  
khensik Comments: thanks,as i have already replaced the switch,ill try to make adjustments and see if there's changes, kind regards
August 5, 2016
  Followup from the Pelican Staff: Let us know what you find. Thanks. - Nick at Pelican Parts  
khensik Comments: hi,i meant the light does not go off unless i pull the lever back with my foot,i hav changed the switch but still the lights dont go off when brake off,
August 1, 2016
  Followup from the Pelican Staff: You may need to adjust or replace the switch. - Nick at Pelican Parts  
khensik Comments: What about when the break light doesnt go off ?
July 16, 2016
  Followup from the Pelican Staff: The switch may be stuck on. - Nick at Pelican Parts  
RAY POWELL Comments: HOW DO I KNOW WHEN THE BRAKE LIGHT SWITCH IS BAD
December 8, 2015
  Followup from the Pelican Staff: It doesn't send the signal to activate the brake lights. - Nick at Pelican Parts  

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Page last updated: Sun 11/19/2017 02:37:30 AM