Antilock Brakes / Traction Control Systems: Service and Repair

ABS/ESP system, component overview
1. Bracket for hydraulic control unit
2. Vacuum pump for brake servo
^ Only on gasoline engines in conjunction with an automatic transmission
3. ABS Control Module (w/EDL)-J104
4. Hydraulic control unit -N55- with ABS Control Module (w/EDL -J104)
^ Hydraulic unit -N55- and ABS Control Module (w/EDL)
5. Sender 1 for brake booster -G201
^ bolted onto hydraulic control unit
6. Hydraulic control unit -N55-with ABS Control Module (w/EDL -J104)
7. Rotor for front right speed sensor
8. Front right speed sensor -G45
9. Warning contact for brake fluid level -F34
10. Instrument cluster
11. Switch for traction control system -E132
^ Location: on the center console
12. Steering angle sender -G85- for ESP
^ Location: Installed on the steering column
^ Performing zero position compensation.
Refer to Guided Fault Finding in VAS 5051
13. Sensor for transverse acceleration -G200 and sender for rotation Rate -G202
14. Parking brake warning switch -F9
^ Location: on the parking brake lever assembly
15. Rotor for rear right speed sensor
16. Rear right speed sensor -G44
17. Rear left speed sensor -G46
18. Rotor for rear left speed sensor
19. TCS/ESP warning lamp -K86
20. ABS warning lamp -K47
21. Brake warning symbol -K118
22. Brake light switch -F
23. Rotor for front left speed sensor
24. Front left speed sensor -G47