Take a look at the steering rack you may notice that the power steering hose connected to it as rusted and it as pins holes, yes also changed the power steering reservoir, after you have changed the hose that as failed, I had to change main hose from power steering pump, as well as connecting pipe work, few photo below for you, only use the proper powering fluid which is green by the way.
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Remove the front drivers wheel, and the arch liner.
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Parts you will need if you find I am right.
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I had trouble with my fixing bolt the allen key had round a little so would not budge.
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I ended up knocking a socket onto it to get it moving took me about 45 minutes just to remove the bolt, that was after removing the power steering main hose from the rack.
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I tagged the power steering hose pipe with a cable tie as I need to cut through it with some cutters, you maybe ok and not need to.
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part I removed you can see its rusted quiet badly.
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The new part was take to pieces as I only need the one part of it, and it made the job easier for me, your situation maybe different you will know as you go.
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New and old main power steering hose as mine had also rusted yours may not have and you may get away with the one part. (LR029185)
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I also replaced the Allen key bolt with a normal six side bolt.
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New reservoir.
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All finished and tidy
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You will need at least two litres of power steering fluid and you will need to bleed the system, clear first then after top up and purge the steering by turning the steering lock to lock while the car is on good axle stands.
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Check the expiry date on the fluid too.
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LR003401
https://rimmerbros.coLR003401m/Item...CJHiO1ovCnR3DVZ79LMde6KdEjc5HV4RoCkjkQAvD_BwE
https://www.britishparts.co.uk/land...service-parts-c140/power-steering-fluid-p3345