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Join Date: Aug 2019
Posts: 26
Power steering flush

Im rebuillding my steering rack and ive noticed a lot of stuff in the fluid and i would like to flush out the system and was wondering if it would be safe to just put a water hose in the reservoir or what i could use
Old 09-18-2019, 07:13 PM
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Join Date: Sep 2011
Location: Florida
Posts: 1,668
God no don’t do that, there is a filter in that reservoir and you will dislodge all the crud in there back into your rack if you use a hose, plus water is not the correct fluid to use in a hydraulic system we try to keep water out of hydraulics at all cost.

You always flush it with the fluid you use in the system and replace the reservoir before filling with clean fluid so the filter is clean. The filter inside the reservoir is not replaceable so just buy a new reservoir.

1. Raise the front wheels off the ground and securely support the car;
3. Disconnect the return line at the reservoir and place it in a suitable container;
4. Disconnect the supply line at the reservoir and drain the hydraulic fluid from both the reservoir and line into a suitable container;
5. Replace the reservoir with a new item, connect the supply line and cap-off the return port;
6. Fill the reservoir with an ATF compatible with Dexron II (I use Febi 08971) and leave the cap off;
7. Start the engine and have an assistant monitor the reservoir level;
8. Turn the steering wheel lock to lock at normal turning speed for a few cycles ensuring you achieve full lock at each extreme;
9. As the reservoir level drops your assistant show replenish the fluid in the reservoir;
10. Repeat 7&8 until the fluid draining from the rack is clean and sludge free. Note: the fluid will never be absolutely clean as it is impossible to remove all the sludge and contaminants in the rack without disassembling or replacing it.
11. Remove the cap and reconnect the return line to the reservoir.
12. Ensure the fluid in the reservoir is at the full mark.
13. Lower the car to the ground and test drive.
Mike A
1986 944 (Street); 1986 944 (Track); 1986 951; 1989 951 (3.0L 8V); 2000 996 Cab.
Old 09-19-2019, 05:54 AM
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Thanks for the help man!
Old 09-19-2019, 12:03 PM
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Another way if you just want to change the fluid is with a suction bulb. With engine off suck out fluid in reservoir. Start engine for a minute and shut off. Again suck out fluid. Pour in a little bit of fresh fluid and start up again for another minute. Suck out fluid again. Repeat a few times and top off, and you will have a nice clean system with fresh fluid. Use high quality fluid like synthetic mobile 1 or valvoline, one quart is enough to do this.

Last edited by djnolan; 09-19-2019 at 03:48 PM..
Old 09-19-2019, 03:46 PM
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