ESP Hydraulic Pump Replacement

Electronic Stability Program (ESP) Hydraulic Pump, Removing And Installing
Special tools and equipment
- Sealing plugs from repair kit Part No. 1H0 698 31 1A
- VAG 1551 or VAG 1552 scan tool
- US1 116 brake bleeder

CAUTION: Part numbers are listed here for reference only, Always check with your Parts department for the latest information.





Component location
The ESP hydraulic pump is located on the left side of the engine compartment below the hydraulic control unit.

Removing
- Place vehicle on lift.

Note: Switch off ignition before removal or installation work. If the vehicle is equipped with a coded radio determine the correct coding before disconnecting the battery.

- Raise vehicle.
- Remove left-front wheel.
- Remove left-front wheelhouse liner.





- Disconnect electrical harness connectors (arrows).
- Remove cover on hydraulic reservoir.





- Unclip attachment strip at bracket.





- Remove mounting screws (arrows) and swing coolant expansion tank to side.
Tightening torque: 6 Nm (53 inch lbs.)





- Remove bolts -1- for hydraulic fluid reservoir and swing to side.
Tightening torque: 10 Nm (7 ft. lbs.)
Pay attention to bottom mounting (rubber grommet) when installing.

Note: Protect the engine compartment from brake fluid which flows out.

CAUTION: Brake fluid must not be allowed to come into contact with paint work because of its caustic effect.





- Loosen hose clamp on suction hose -1- and detach.
- Disconnect brake lines -3- and -4-.
- Seal brake lines and threaded holes with plugs from repair kit Part No. 1H0 698 311A.
- Unclip brake lines from fixture.
- Remove nut -2-.
- Remove bolts for mounting bracket refer to item 3.
- Working from engine compartment, lift bracket together with hydraulic pump approx. 30 mm (1 3/16 inch) and remove.

Installing

Note: When installing, pay particular attention to the following points.
- Only remove the sealing plugs on the new hydraulic control unit when the corresponding brake line is about to be installed.
- If the sealing plugs are removed too early the brake fluid can escape.

- Bleed brake system. Refer to Brake hydraulic system, bleeding and changing brake fluid.

Bleeding Brake System Using US1116 Brake Bleeder
- Connect US1116 brake bleeder.
- Open bleeder screws in the following sequence and bleed brake calipers (assist with pedal pressure, if necessary).

Bleeding sequence
2. Left-rear brake caliper
3. Right-front brake caliper
1. Right-rear brake caliper
4. Left-front brake caliper