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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, 10:44 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 10:52 PM.
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  #67  
By Zero_09 on 07-12-2013, 11:33 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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  #68  
By Ghos7N54 on 08-17-2015, 01:02 PM
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I wanted to revive this thread for one, it has been very informative and helpful. Secondly my cap says use ATF only, so I planned on picking up Castrol ATF, but how can I be sure that ATF is whats currently in the system and not CHF? Just cautious of this since CHF and ATF CANNOT be mixed.
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  #69  
By duaux on 08-17-2015, 04:27 PM
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Quote:
Originally Posted by Ghos7N54 View Post
I wanted to revive this thread for one, it has been very informative and helpful. Secondly my cap says use ATF only, so I planned on picking up Castrol ATF, but how can I be sure that ATF is whats currently in the system and not CHF? Just cautious of this since CHF and ATF CANNOT be mixed.
Unfortunately, you can not be "certain".

My mechanic based it on "his experience", looking at the colour and smelling it. He basically also told me that "he is 100% certain" that all E90 came with CHF for power steering and that my car just "lost the green sticker".

***WARNING*** I am not telling you to following me... experience may differ!

For me, I trusted him and he flushed it with CHF (full drain and fill). It has been 2 years and my car is fine.
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  #70  
By Ghos7N54 on 08-17-2015, 08:04 PM
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Quote:
Originally Posted by duaux View Post
Unfortunately, you can not be "certain".

My mechanic based it on "his experience", looking at the colour and smelling it. He basically also told me that "he is 100% certain" that all E90 came with CHF for power steering and that my car just "lost the green sticker".

***WARNING*** I am not telling you to following me... experience may differ!

For me, I trusted him and he flushed it with CHF (full drain and fill). It has been 2 years and my car is fine.
You just happened to be right anyways

Just talked to an old buddy that works at BMW of San Antonio and he looked it up and did confirm that my 2007 E90 335i does require CHF 11. Thanks!
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  #71  
By mweisdorfer on 08-18-2015, 07:25 PM
Quote:
Originally Posted by Sexyjen
My car needs power steering fluid. 2007 335i. I've heard 2 separate brands to try but not sure which one. Anyone know which i am supposed to use?
I just used a brake vac and had a buddy of mine turn on the car with the front end on Jack stands. He turned the car on and turned the wheel several times while I sucked out the old chs11.

I put AMSOIL ATF back in. We poured the new AMSOIL in while the car was still on and turned the wheel several times to make the pump suck the new ATF in. We did this until the pump stopped whining and the level of the fluid remained constant in the reservoir.

We then used the brake vac to suck out the new ATF out, in the same manner described above, which was not a nice red color due to it mixing with the residual CHS11 remaining in the system.

We then put more AMSOIL ATF back in the system in the same manner described above.

Presto - bright red fluid.

You should change out the power steering fluid every 50k or your probability of changing out a new power steering pump after 100k gets greater.

Last time I checked that part is not cheap.
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