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Audi A4 Brake Light Switch Replacement
 
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Pelican Technical Article:

Audi A4 Brake Light Switch Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$10 to $25

Talent:

**

Tools:

10mm socket

Applicable Models:

Audi A4 (2002-05)
Audi A4 Cabriolet (2003-06)

Parts Required:

New brake light switch

Hot Tip:

Put a dab of grease on the end plunger

Performance Gain:

Working brake lights

Complementary Modification:

Detail the interior

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. There were two types of brake switches over the years. You should only install the new type which can be determined by the light colored end on the push rod head. The switch is mounted to the pedal cluster and is replaced by working inside the car, below the dash on the driver side.

To get access to under the dash on the driver side you will need to first remove the driver lower storage compartment. Please see our article on this procedure for further assistance.

Access to the brake pedal switch is blocked by a kick panel under the dash (red arrow).
Figure 1

Access to the brake pedal switch is blocked by a kick panel under the dash (red arrow).

This kick panel is part of the driver lower storage compartment or lower dash board and must be removed to replace the brake light switch.
Figure 2

This kick panel is part of the driver lower storage compartment or lower dash board and must be removed to replace the brake light switch. Please see our article on driver lower storage compartment removal for additional instruction.

With the lower dash removed you can get easy access to the brake pedal switch.
Figure 3

With the lower dash removed you can get easy access to the brake pedal switch. It is attached to the pedal mount in front of the brake pedal. The switch needs to be turned 45 degrees counter clockwise in its mount (yellow arrow) and then pulled out. I like to remove the electrical harness connection (red arrows) after I remove the switch from the mount as the plastic tabs that hold it in place can be fragile and break easily from the pressure of trying to wiggle the harness connection off.

You can tell this is the new style of switch from the light color on the end of the plunger (red arrow).
Figure 4

You can tell this is the new style of switch from the light color on the end of the plunger (red arrow). Place a little grease on the end of the plunger to help lubricate its contact point on the brake pedal.

Install the wiring connection, push the brake pedal in and insert the plunger end into the mount (red arrow) and turn 45 degrees clockwise.
Figure 5

Install the wiring connection, push the brake pedal in and insert the plunger end into the mount (red arrow) and turn 45 degrees clockwise. Use care when installing so as not to break the plastic clips that lock it in place (yellow arrow). Check brake light function and reinstall the driver lower storage compartment.

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June 29, 2016
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