Power steering system, checking for leaks

WARNING: This page is about a different car, the 2004 Audi S4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The steering system must be checked for leaks after assembly operations and in case of a lack of hydraulic fluid level in reservoir.

Start engine.
Turn steering wheel from lock to lock in both directions and hold briefly.
This builds up maximum possible pressure.

NOTE:

To avoid pump damage, the steering wheel must not be held at the end stop for longer than 10 seconds during this check.

Check the following components for leaks in this position:

Steering pinion oil seal on valve housing of steering gear.
All line connections.
Rack oil seals

This check can only be carried out with boots pushed back.

Open spring clip and hose clamp on boot.
Push boot back.

Steering gear must be replaced if fluid is visible in steering gear housing and/or in boot.