Control Module And Hydraulic Unit Overview

Anti-lock Brake System (ABS)/Electronic Differential Lock (EDL)/Anti-Slip Regulation (ASR)/Electronic Stabilization Program (ESP), TRW

Fig 1: Identifying Control Module And Hydraulic Unit Assembly Overview

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

1. Brake Booster
   • Removing and installing, refer to BRAKE BOOSTER
2. Brake Line
   • Master brake cylinder/primary piston circuit to hydraulic control unit
   • Identification: diameter 6.5 mm and tube fitting with longer thread M12 x 1
   • Marked on hydraulic unit with HZ1
3. Brake Line
   • Master brake cylinder/secondary piston circuit to hydraulic unit
   • Identification: diameter 6.5 mm and tube fitting with longer thread M12 x 1
   • Marked on hydraulic unit with HZ2
4. Brake Line
   • To right front brake caliper
   • Identification: diameter 5.25 mm and tube fitting with thread M 10 x 1
   • Marked on hydraulic unit with VR
5. Brake Line
   • To left rear brake caliper
   • Identification: diameter 5.25 mm and tube fitting with shorter thread M12 x 1
   • Marked on hydraulic unit with HL
6. Brake Line
   • To right rear brake caliper
   • Identification: diameter 5.25 mm and tube fitting with thread M 10 x 1
   • Marked on hydraulic unit with HR
7. Brake Line
   • To left front brake caliper
   • Identification: diameter 5.25 mm and tube fitting with shorter thread M12 x 1
   • Marked on hydraulic unit with VL
8. ABS Control Module -J104-

   It is not possible to separate the control module and hydraulic unit.

   • Removing and installing. Refer to ABS CONTROL MODULE AND HYDRAULIC UNIT .
9. ABS Hydraulic Unit -N55-

   It is not possible to separate the control module and hydraulic unit.

   • Removing and installing. Refer to ABS CONTROL MODULE AND HYDRAULIC UNIT .
10. Bracket
11. Inner TORX® Bolt
    • 8 Nm
12. Rubber Insulation