Service

Electronic Stability Program (ESP) Hydraulic Unit, Servicing
The tightening torque for all brake lines on the Audi A4 is 15 Nm (11 ft. lbs.).





1. ESP hydraulic unit
- Always replace complete unit
2. Nut
- 12 Nm (9 ft. lbs.)
3. Bolt and washer assembly
- 9 Nm (80 inch lbs.)
- 3x
4. Resilient bushing
- 2x
5. ESP hydraulic pump -V156-
- Assembly includes brake pressure sensor
6. Resilient pad
- Pad stud mount to hydraulic pump: 2 Nm (18 inch lbs.)
7. Vehicle body
8. Nut
- 9 Nm (80 inch lbs.)
9. Bracket





1. Left-front brake line
2. Right-front brake line
3. Brake line
- ESP hydraulic pump to brake master cylinder primary piston circuit
4. Fixture
5. Connection fitting
6. Hose clamp
7. Hose
8. Hose clamp
9. Suction line
10. Brake line
- To ESP hydraulic pump
11. Brake line
- To brake master cylinder secondary piston circuit