BMWs are German automobiles renowned for their performance and high-quality engineering. But like any vehicle, BMWs need to be properly maintained in order for them to run reliably. One area that can have problems is the power steering system, which can suffer from leaks in the power steering hoses. Though it can be a messy job, power steering hoses can be replaced in a couple of hours or less by a home mechanic.
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Things you need
- Floor jack
- Jack stands
- Socket set and ratchet
- New power steering hose or hoses
- New crush washers
Raise the front of the vehicle with the floor jack and lower it onto a pair of jack stands. Refer to your owner’s manual for the location of the jacking points as they vary depending on the model of BMW.
Remove the splash guard that protects the bottom of the motor if your model of BMW is equipped with one. The splash guard is held on with a series of bolts or screws that run around its perimeter. Use the appropriately sized socket and a ratchet to remove the splash guard. Put the bolts somewhere where they won’t be misplaced and set the splash guard aside.
Locate the power steering pump and the hydraulic hoses that are routed to it. Most models will have two lines going to the pump. Determine which one is leaking by cleaning the hoses and then seeing which one is producing hydraulic fluid. Often the hoses will leak where they are bolted on because of a worn crush washer.
Remove the hose by removing the banjo bolts that holds the hose in place on either end. Use a socket or an open-ended wrench. Wipe up any spilt power steering fluid with a rag. Wipe the bolts down so that they are clean and then bolt on the new pump, being sure to install a new copper crush washer to seal the bolt.
Top up the power steering reservoir with power steering fluid to the full mark. Turn the car on and turn the steering from side to side as far as it will go several times until the power steering pump stops whining. This should purge the system of air bubbles. Check the reservoir and top up with fluid if necessary.
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