Antilock Brakes / Traction Control Systems: Locations

Anti-Lock Brake System

ABS/Electronic Stabilization Program Bosch 8.1 Component Overview












1 Right Rear ABS Wheel Speed Sensor -G44-
• Location view: => [ Rear ABS Wheel Speed Sensors ] See Image Below.
2 Left Rear ABS Wheel Speed Sensor -G46-
• Location view: => [ Rear ABS Wheel Speed Sensors ] See Image Below.
3 ESP Sensor Unit -G419-
• Combined Transverse Acceleration Sensor -G200- , Rotation Rate Sensor -G202- , and Longitudinal Acceleration Sensor -G251-
• Component location: Under the left front seat => [ Electronic Stabilization Program Sensor Unit ] See Image Below.
4 Brake Lamp Sensor
• Component location: On the brake pedal => [ Brake Light Switch ] See Image Below.
5 Brake Pedal
• With bracket for the brake lamp sensor => [ Brake Light Switch ] See Image Below.
6 Electromechanical Parking Brake Indicator Lamp
• Located in the tachometer
7 Brake System Warning Lamp -K118-
• Located in the tachometer
8 ABS Warning Lamp -K47-
The indicator lamp monitors the ABS and the Electronic Differential
Lock (EDL). The EDL and ABS work together. The ABS indicator light lights
up when the EDL malfunctions.
• Located in the tachometer
9 ASR/ESP Control Lamp -K155-
• Located in the tachometer
10 Left Front ABS Wheel Speed Sensor -G47-
• Location view: => [ Front ABS Wheel Speed Sensors ] See Image Below.
ABS/Electronic Stabilization Program Bosch 8.1 Component
Overview continued





11 - ABS Hydraulic Unit -N55- with ABS Control Module -J104-
• With Brake Pressure Sensor 1 -G201-
• The ABS hydraulic unit with ABS control module, is located in the left front of the engine compartment => [ ABS Hydraulic Unit with Control Module Assembly Overview ] See Image Below.

12 - Return Ring

13 - Steering Angle Sensor -G85-
• Component location: Installed in the coil ring with slip ring on the steering column => [ Steering Angle Sensor ] See Image Below.

14 - Right Front ABS Wheel Speed Sensor -G45-
• Location view: => [ Front ABS Wheel Speed Sensors ] See Image Below.

15 - ASR/ESP Button -E256-
• Located in the center console

16 - Audi Hold Assist Switch
• Located in the center console

17 - Parking Brake Pressure Switch -F234-
• Located in the center console

18 - Diagnostic Connection
• Component location: Under the cover in the driver footwell


Rear ABS Wheel Speed Sensors






1 - Left Rear ABS Wheel Speed Sensor -G46- and Right Rear ABS Wheel Speed Sensor -G44-
- Left rear sensor shown, right rear similar

Electronic Stabilization Program
Sensor Unit






1 - ESP Sensor Unit -G419-
3 - ESP Sensor Unit 2 -G536-
- The ESP sensor unit -G419- and -G536- are installed under the left front seat on all models

Front ABS Wheel Speed Sensors






1 - Left Front ABS Wheel Speed Sensor -G47- and Right Front ABS Wheel Speed Sensor -G45-
- Right front shown, left front similar

ABS Hydraulic Unit with Control
Module Assembly Overview






1 - ABS Hydraulic Unit -N55-
3 - Connector for ABS Control Module -J104-
- The hydraulic control unit is comprised of the ABS hydraulic unit with brake pressure sensor -G201- and the ABS control module

Steering Angle Sensor






2 - Airbag Spiral Spring/Return Spring With Slip Ring -F138- with Steering Angle Sensor -G85-
- The airbag spiral spring/return spring with slip ring -F138- and the steering angle sensor -G85- are integrated in the steering column electronic systems control module -J527-.

Brake Light Switch






1 - Brake Light Switch -F- and Brake Pedal Switch -F47-

Brake Booster/Brake Master Cylinder Assembly Overview






1 - Brake fluid reservoir
3 - Sealing cap with Brake Fluid Level Warning Switch -F34-

Vacuum Pump Assembly Overview






1 - Vacuum line
2 - Electrical connector
3 - Brake System Vacuum Pump -V192-