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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Power Steering Flush DIY E90



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  Power Steering Flush DIY E90
the optimum way
allmotorh22
12-31-2010
Did alot of searching on how to flush the power steering for the e90,
the best I could find is this:
http://www.dvatp.com/bmw/diy/power_steering_flush/

Doug was specific on e36/46, and...
  #66  
By ska///235i on 05-18-2013, 09:44 PM
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man you guys are crazy doing all that work for steering fluid...just suck out fluid from reservior with a fluid extractor and refill, then start the car and turn steering left-right...repeat (3 times) until you use the entire bottle of ch11s. Do this every 30k-40k miles and you're golden. I also replaced the reservor cap with a new one that has a o-ring. My 2006 e90 stock cap didnt have the o-ring and it had alot residual on the cap...highly recommend if your cap do not have o-ring.

I use this oil suction gun...works like a charm. One pull and all the fluid was out of the reservior

http://www.harborfreight.com/oil-suction-gun-95468.html
Last edited by ska///235i; 05-18-2013 at 09:52 PM.
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  #67  
By Zero_09 on 07-12-2013, 10:33 AM
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Quote:
Originally Posted by mthomas View Post
I modified the original approach as I could not envision how to do it without making a complete mess of the vehicle and garage floor. I think this is actually the e46 method referenced by the OP in his posting.

Less messy technique:

Lift front of vehicle. Please do this safely.

Remove plastic underbody, air box, and air intake duct from in front of engine to aid access.

Release the tension on the serpentine belt, and move it out of the way to improve access and prevent getting any oil on to it. This is a great time to do maintenance in this area as well.

Completely drain the reservoir with your suction device of choice. Get down behind the filter to minimize mess in the next step. I got about 250 ml out, it was a little bit low to start.

Remove the banjo bolt at the bottom of the PS pump. I removed by reaching in from above. This allowed me to place some aluminum foil, prior to opening the bolt, below and channel the fluid forward and into a container with a funnel on top, with minimal mess. It is also an easy bolt to access, and retighten.

Turning the steering wheel repeatedly from stop to stop for about five or ten minutes will pump fluid up to the reservoir, which will then drain down to the pump and out the bottom. I also used a small syringe to again fully empty the reservoir. I was able to get another 450 ml of fluid out.

Replace the banjo bolt and line, use new crush washers.

Degrease any pulleys that might have been contaminated, then replaced serpentine belt.

I refilled with 700 ml of fluid. This takes a little while, turn the steering wheel, start and stop the engine, etc. Ignored the horrible noises, got the air out and ran the engine for a while, then emptied the reservoir again and refilled with the remaining 300 ml in the can.

Assuming a 1 liter capacity (complete guess), this means the first flush left 30% old fluid, and the second, reservoir only, flush got it down to about 22% old fluid. Looks much better, but I wish there was a way to get all the fluid out. Using the easier drain reservoir and refill method, five cycles should get you to the same place, but would require 1.25 liters of fluid.Hope this helps someone. Sorry no pics, there are plenty of them above. The PS pump is right above the rack and to the front. Just trace the lines.
This is one of the reason I'd rather not drained it this way. If I have to take out the air box, air intake duct, and serpentine belt to prevent from making a mess than I think I'd go the turkey baster route.
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