A8L V8-4.2L (BFM) (2004)
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Turn steering wheel approximately 10 times from stop to stop.
Test requirements:
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Ribbed V-belt ribbed V-belt tension OK
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No system leakage
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Hoses/lines neither kinked nor trapped
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Now check pumping pressure
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Close cut-off valve (Item -1-) with engine idling and take pressure reading.
Note: To avoid damaging the pump, note the following:
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The pressure gauge's cut-off valve must not remain closed for more than 10 seconds when carrying out this test.
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Start the engine without pressing the accelerator and let it run at idling speed.
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Read off the pump pressure at idling speed immediately after starting the engine (if necessary, have a second mechanic read off the pressure).
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The pressure will drop during the test; take the highest pressure reading as the test value
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Start engine and top off fluid level in reservoir if necessary.
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Take pressure reading from pressure gauge at idling speed (measurement not longer than 10 seconds).
Specified value of delivery pressure: 125 - 130 bar
Note: Replace vane pump if specified value is not attained
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Stop engine.
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Remove pressure gauge.
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Connect pressure line to power steering pump with banjo bolt.