ABS/ESP system, component overview

WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: ABS/ESP System, Component Overview

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Bracket for hydraulic control unit

Removing and installing → Hydraulic control unit, removing and installing

2 - Brake booster vacuum pump

Only on gasoline engines with automatic transmission

3 - ABS control module J104

The ABS hydraulic unit N55 and ABS control module J104 together make up the hydraulic control unit.
Removing and installing → Hydraulic control unit, removing and installing

4 - ABS hydraulic unit N55 with ABS control module J104

The ABS hydraulic unit N55 and ABS control module J104 together make up hydraulic control unit.
Removing and installing → Hydraulic control unit, removing and installing

5 - Brake pressure sensor 1 G201

Screws onto hydraulic unit

6 - ABS hydraulic unit N55 with ABS control module J104

7 - Rotor for right front speed sensor

Checking/removing and installing Front axle rotor, checking or removing and installing

8 - Right Front ABS Wheel Speed Sensor G45

Removing and installing → Front axle speed sensor, removing and installing

9 - Brake fluid level warning switch F34

10 - Instrument cluster

11 - Anti-slip control switch E132

Location: on center console

12 - Steering angle sensor G85

Location: Incorporated in return spring with slip ring on steering column →
- 69 - PASSENGER PROTECTION - AIRBAGS, SEAT BELTS
- 69 - PASSENGER PROTECTION - AIRBAGS, SEAT BELTS for BODY EXTERIOR - CABRIOLET
Performing zero compensation VAS 5051 vehicle diagnostic, testing and information system

13 - Transverse Acceleration Sensor G200 and Rotation Rate Sensor G202