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The Stop Light Switch for the Tiptronic is PN# 996.613.110.01.
It's located in a bayonet mount in the Pedal Block - disconnect the electrical connector and turn the switch body 90°.
A common problem is that if the switch is 'overpressed' the switch travel or pedal travel up to the switching point is lost.
This results in the brake lights being always on or flickering when travelling over bumps.
In vehicles with cruise control, the cruise control can be accidentally deactivated from vibrations.
From the Factory Repair Manual:
The switches must be readjusted after any work in which the brake pedal is moved out of its "normal" position (for example, work on the pedals or on the brake unit).
Checking stop light switch adjustment:
The pedal must be felt to travel approx. 5 to 10 mm before the brake light lights up. At the same time, check (make sure) that the brake light lights up before the pedal meets perceptible resistance or before brake pressure builds up.
Adjusting switch in the event of insufficient pedal travel:
There are two possible ways of adjusting the switch if the pedal travel to the operating point is too small.
1: Press brake pedal and pull out plunger of the switch.
Release pedal. Check adjustment.
2: Release switch by turning it 90°, and pull it out of its installation opening.
Pull switch plunger out of the switch as far as it will go.
Reinstall switch.
When fitting the switch for the first time, it is important to press vertically against the bearing surface. It will otherwise not be possible to lock the switch (90° turn), even using a lot of force.
Note:
The switch might not fit in its seat without play after it has been installed and removed several times.
As soon as the switch perceptibly "wobbles" in its receiver, it must be replaced by a new switch.
Adjusting the switch if the pedal travel is too large:
Press the pedal; press the plunger into the switch by one notch (audible click). This decreases the pedal travel to the operating point by approx. 3 ... 4 mm. Then recheck the adjustment.
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