As you can see on the image the EPC light was on, at the same time the brake lights remained on without depressing the brake pedal.
To gain access to the brake light switch it is necessary to remove the driver's side lower cover panel, to do so, remove the clips that keep it in place and remove it from the vehicle as shown on the image.
Make sure that the ignition is off and the key is removed, disconnect the connector from the brake light switch by pressing on the plastic tabs with your fingers and pulling it away from the switch at the same time.
Remove the old brake light switch by turning it counterclockwise 45 grados and pulling it out of the mounting hole as shown in the image.
As you can see on the image, the brake light switch on the left is the new upgraded design, its design is slightly different from the original but the electrical connector remains the same.
Before installing the new switch on the vehicle, lubricate the plunger with a light coat of lubricant ( G 052 142 A2 or equivalent ) as shown on the image.
Install the new sitch inserting it fully into the mounting hole pressing the plunger against the brake pedal to adjust plunger position, make sure that the brake pedal is in the resting position DO NOT depress NOR hold the pedal up as you install the new brake light switch, secure switch and plunger position by turning the switch slowly fully to the right ( clockwise) aprox. 45 degrees to its stop.
IMPORTANT: a click should be heard when the switch is turned to the correct position. This action locks the plunger adjustment.
Once the new switch has been installed correctly, connect the electrical connector back on and start the vehicle, the EPC light should come on for a few seconds only indicating that the system is working, but it shouldn't stay on.
Verify that the brake lights are not on and ask an assistant to depress the brake pedal to verify that they are working properly, if everything is working ok., proceed to install the lower cover panel back on the vehicle.