Antilock Brakes / Traction Control Systems: Locations

Component Locations: Anti-Lock Brake Systems

Bosch 8.1 ABS/Electronic Stabilization Program 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 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 => [ Electronic Parking Brake Assembly Overview ] Locations
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.
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






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

Electronic Stabilization Program
Sensor Unit






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

Front ABS Wheel Speed Sensors






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

Note:
• The sensor ring/rotor is installed in the respective wheel bearing
unit and cannot be replaced.


ABS Hydraulic Unit with Control Module
Assembly Overview






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

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-

Vacuum Pump Assembly Overview, with 3.0L and 4.2L Engines






3 - Brake System Vacuum Pump -V192-

Brake Booster Pressure Sensor






Located in the plenum chamber near the brake booster.
1 - Connector for Brake Booster Pressure Sensor -G294-