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



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      02-10-2015, 01:09 AM   #1
btc
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DIY-Power Steering Reservoir Mod

How to keep the reservoir cap clean from the droopy & sticky fluid.
No tool need to do this addition, just need a can of brake cleaner & old cotton t-shirt (I have all this from previous brake work). Instead of using a sock, bought a set of black wristbands (many color selection) in the sport section at Walmart over $5 with tax. It contain 2 in a pack, keep the extra one for spare or give it to a friend. Clean the power steering reservoir & cap. I spray brake cleaner onto an old t-shirt then wipe away, DO NOT spray brake cleaner into your engine bay or near paint surface. Install the wrist band onto the reservoir just like in the picture.
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      02-10-2015, 01:46 AM   #2
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Cool little DIY! Motorcycle guys have been doing the same exact thing for years. Never thought about doing it to my car. .
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      02-10-2015, 12:31 PM   #3
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You can also replace the o-ring in the reservoir cap, and that will fix the seeping.
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      02-10-2015, 01:30 PM   #4
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no it won't i've done that twice, still leaks, new res, still leaks, all oem parts.

Its not a good design the new cars have a better res.
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      02-10-2015, 03:15 PM   #5
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Quote:
Originally Posted by Meeni View Post
You can also replace the o-ring in the reservoir cap, and that will fix the seeping.
the cap has a weep hole in it to keep from building up pressure inside. That's where it can come out.
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      02-10-2015, 07:17 PM   #6
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Here a picture of the weep hole on the cap.

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Originally Posted by davidwarren View Post
the cap has a weep hole in it to keep from building up pressure inside. That's where it can come out.
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      02-10-2015, 08:49 PM   #7
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The sipping and dirty grime stopped when I replaced the o-ring. Worth a try for less than the cost of the sock.
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      02-11-2015, 01:09 PM   #8
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Though this sounds like a good idea, I have one serious concern.

What happens when the fluid breaks down the elastic in the wristband and now you have a nice piece of cloth that can become an object flying around your engine bay at 70 mph on the interstate.

Last edited by Greyfox; 02-12-2015 at 12:36 PM.
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      02-12-2015, 12:07 AM   #9
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This is new for me, but I will report back in 3 months for an update.

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Though this sounds like a good idea, I have one serious concern.

What happens when the break fluid breaks down the elastic in the wristband and now you have a nice piece of cloth that can become an object flying around your engine bay at 70 mph on the interstate.
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      02-12-2015, 12:42 AM   #10
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It's not brake fluid, it's oil, it should not harm the elastic band in any foreseeable future.
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      02-12-2015, 01:35 AM   #11
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great mod
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      02-12-2015, 12:48 PM   #12
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Quote:
Originally Posted by Meeni View Post
It's not brake fluid, it's oil, it should not harm the elastic band in any foreseeable future.
I miss typed the sentence and was not refering to "brake fluid" but fluid breaking down the wrist bands.

Most power steering fluids are petroleum based and the elastic in wrist bands are no where near "industrial" or "automotive" grade rubber or other polymer.

But, it's your car you will be doing it to... thank goodness not mine.
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