Hydraulic Unit Control and Brake Lines

ABS hydraulic control unit and brake lines
The tightening torque for all brake lines on the Audi A4 is 15 Nm (11 ft. lbs.).
1. Brake master cylinder and brake servo
2. Brake line
- Brake master cylinder/primary piston circuit to hydraulic control unit
3. Brake line
- Brake master cylinder/secondary piston circuit to hydraulic control unit
4. Brake line
- Hydraulic control unit to left front brake caliper
5. Brake line
- Hydraulic control unit to right front brake caliper
6. Suction dampers
- Designed to improve pressure build-up during operation of EDL
- Discontinued; phased in integration into hydraulic control unit
7. Brake line
- Hydraulic control unit to left rear brake caliper
8. Brake line
- Hydraulic control unit to right rear brake caliper
9. Nut
- 10 Nm (7 ft. lbs.)
10. Bolt
- 10 Nm (7 ft. lbs.)
11. Bracket