Technical Service Bulletin # 941156
Lighting - Brake Light Switch Adj. And Removal
94 Brake light sensor (switch) adjustment and removal information
94 11 56
2026388/1
November 7, 2011.
Date: 111107Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 150
Affected Vehicles
Condition
Replaced brake light sensors are sometimes damaged during adjustment or removal, preventing proper analysis for quality purposes.
Technical Background
It is not necessary to remove the brake light sensor to perform an adjustment. Special tool T40168A is required to properly remove the
brake light sensor.
Production Solution
Not applicable.
Service
Adjustment procedure for the brake light sensor:
1. Switch ignition off.
2. Remove the driver's side instrument panel lower close out panel to gain access to the brake light sensor.
3. Push the brake light sensor plunger all the way in and hold. (Figure 1, arrow A).Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 151
4. Turn the magenta colored positioner counter-clockwise, approximately 60? to the stop. (Figure 2, arrow A). The brake light sensor is
ready for adjustment.
5. Ensure the brake pedal is in its rest position and must not be moved.
6. Fully release the plunger. (Figure 3, arrow A).
7. Turn the magenta colored positioner clockwise, approximately 600 to the stop. (Figure 4, arrow B). The brake light sensor is now
correctly adjusted.
Removal of the brake light sensor:
1. Switch ignition off.Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 152
2. Remove the driver's side instrument panel lower close out panel to gain access to the brake light switch.
3. Push the brake light sensor plunger all the way in and hold. (Figure 5, arrow A).
4. Turn the magenta colored positioner counter-clockwise, approximately 60? to the stop. (Figure 6, arrow A). The brake light sensor is
ready for removal.
5. Release the plunger. (Figure 7, arrow A).
6. Install special tool T40168A between the brake light sensor plunger and the brake pedal.Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 153
(Figure 8, special tool T40168A).
(Figure 9, T40148A installed).
Tip: The cone on the tool must face in the direction of the driver seat. The opening on the tool must align with the projection on the brake
light sensor.
7. Press tool T40168A against the brake light sensor. The three tabs on the brake light sensor unlock at the same time.
8. Remove the brake light sensor and remove the tool from the sensor.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Required parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and
service manuals for the latest information.
Lighting - Brake Light Switch Adj. And Removal
94 Brake light sensor (switch) adjustment and removal information
94 11 56
2026388/1
November 7, 2011.
Date: 111107Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 150
Affected Vehicles
Condition
Replaced brake light sensors are sometimes damaged during adjustment or removal, preventing proper analysis for quality purposes.
Technical Background
It is not necessary to remove the brake light sensor to perform an adjustment. Special tool T40168A is required to properly remove the
brake light sensor.
Production Solution
Not applicable.
Service
Adjustment procedure for the brake light sensor:
1. Switch ignition off.
2. Remove the driver's side instrument panel lower close out panel to gain access to the brake light sensor.
3. Push the brake light sensor plunger all the way in and hold. (Figure 1, arrow A).Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 151
4. Turn the magenta colored positioner counter-clockwise, approximately 60? to the stop. (Figure 2, arrow A). The brake light sensor is
ready for adjustment.
5. Ensure the brake pedal is in its rest position and must not be moved.
6. Fully release the plunger. (Figure 3, arrow A).
7. Turn the magenta colored positioner clockwise, approximately 600 to the stop. (Figure 4, arrow B). The brake light sensor is now
correctly adjusted.
Removal of the brake light sensor:
1. Switch ignition off.Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 152
2. Remove the driver's side instrument panel lower close out panel to gain access to the brake light switch.
3. Push the brake light sensor plunger all the way in and hold. (Figure 5, arrow A).
4. Turn the magenta colored positioner counter-clockwise, approximately 60? to the stop. (Figure 6, arrow A). The brake light sensor is
ready for removal.
5. Release the plunger. (Figure 7, arrow A).
6. Install special tool T40168A between the brake light sensor plunger and the brake pedal.Audi A8L Quattro Sedan (4E8) V8-4.2L (BVJ)
Page 153
(Figure 8, special tool T40168A).
(Figure 9, T40148A installed).
Tip: The cone on the tool must face in the direction of the driver seat. The opening on the tool must align with the projection on the brake
light sensor.
7. Press tool T40168A against the brake light sensor. The three tabs on the brake light sensor unlock at the same time.
8. Remove the brake light sensor and remove the tool from the sensor.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Required parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and
service manuals for the latest information.
