Checking the power steering system for leaks |
Check the power steering system for tightness after assembly work and in the event of hydraulic oil loss in the reservoir. |
Special tools and workshop equipment required |
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| Vehicle system tester -V.A.G 1552- or vehicle diagnosis, measurement and information system -VAS 5051- |
Note Because of the different dimensions of the battery the screw cap of the hydraulic oil reservoir on certain vehicle versions is concealed by the battery tray and battery. If this is the case remove the air filter, the battery and the battery tray → Electrical System → Rep. gr.27. |
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| Remove front left wheel. |
Caution Observe the applicable safety instructions for disconnecting the battery with jumper cables! |
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| If necessary connect battery to jumper cables. |
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| Start engine and run in idle. |
Note A 2nd mechanic is required to check the tightness of the pressure line, return line and the connections. |
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| Turn the steering wheel in both directions up to the stop and hold for maximum 5 to 10 seconds. |
| This will build up the highest possible pressure. |
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| Check the pressure line (expansion hose) and return line (return hose) for tightness. |
| If there are leaks replace the relevant line or hose. |
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| Check all line and hose connections for correct position and tightness. |
| In the event of leaks tighten the line or hose connections to the allowed tightening torques or replace the seal or line. |
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| Checking the engine pump aggregate for tightness. |
| If there are leaks replace the engine pump aggregate. |
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| Check the hydraulic oil reservoir for tightness. |
| If there are leaks replace the engine pump aggregate. |
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| Check the level of hydraulic oil, top up with oil if necessary → Chapter |
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| If there is a repeated loss of hydraulic oil from the engine pump aggregate reservoir, and if the line or hose and its connections as well as the engine pump aggregate and its reservoir have been repeatedly thoroughly inspected, remove and inspect the power steering gear. |
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| The checking of the power-steering gear is identical to the steering gears of TRW and KOYO. The figure shows the power-steering gear of TRW. |
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| Removing the power-assisted steering drive → Chapter |
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