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  #1  
Old 11-07-2020, 08:41 AM
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Interesting find about OEM struts / shocks difference between 4.6is and 3.0

When I did full suspension refresh on 4.6is 6 years ago:
https://xoutpost.com/bmw-sav-forums/...gs-delete.html
I found the OEM Delphi struts and shocks to be somewhat worn at 106k miles.
I guess nothing surprising there as the weight of the X5 and the 20" wheels are not exactly friends to the suspension.
Well, I just finished replacing the caliper guide bolts and rubber groomets on the rear of the 3.0 and and to my surprise I've realized that OEM struts and shocks are made by Bilstein.
Now, I don't know if Bilstein only came on 3.0 Sport Package but I'm big fan of Bilstein so I'm pleased.

Side note:

I've always argued that you're not suppose to lubricate guide pins and here is the proof:
I've had left rear brake sticking lately on 3.0 and when checked with digital thermometer it was 520 F at some point while others were in low 100 F +.
I've removed the caliper last night and found guide pin stuck in bunch of grease inside the boot. Sure, coroded pin didn't help and maybe less grease would be fine but I never use any and never had this issue before.
I've checked everything because i though wheel bearing would be shot with that kind of temperature but it seems it was only for short period of time.
New guide bolts and rubber groomets and no more sticking brake:

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  #2  
Old 11-07-2020, 09:17 AM
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Better proof is BMW TIS says to not grease; only clean.

34 21 812 Overhauling left or right rear brake caliper (brake caliper removed)

Special tools required:

34 1 132
Note:
Use repair kit,

refer to BMW Parts Service.


Take off plastic caps (1).

Unscrew guide screws (2).

Installation:
Only clean guide screws; do not grease. Check guide bolts, replace if necessary.

Tightening torque: 34 21 5AZ
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  #3  
Old 11-07-2020, 09:23 AM
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Quote:
Originally Posted by jbfrancis3 View Post
Better proof is BMW TIS says to not grease; only clean.

34 21 812 Overhauling left or right rear brake caliper (brake caliper removed)

Special tools required:

34 1 132
Note:
Use repair kit,

refer to BMW Parts Service.


Take off plastic caps (1).

Unscrew guide screws (2).

Installation:
Only clean guide screws; do not grease. Check guide bolts, replace if necessary.

Tightening torque: 34 21 5AZ
Correct, I forgot about TIS being additional proof.
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  #4  
Old 11-07-2020, 11:41 AM
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Good to know. Almost never grease the pins doing a brake job on other makes and never on a BMW so it's nice confirmation. Thanks.
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  #5  
Old 11-07-2020, 11:52 AM
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Quote:
Originally Posted by crystalworks View Post
Good to know. Almost never grease the pins doing a brake job on other makes and never on a BMW so it's nice confirmation. Thanks.
No problem.
TIS is not without its faults but it's nice to have official confirmation as well.
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  #6  
Old 11-07-2020, 12:29 PM
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Interesting, I've always been a greaser and never had any issues.
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  #7  
Old 11-07-2020, 01:08 PM
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I've been very familiar what is advised in TIS but I've still always used a thin layer of brake cylinder paste (silicone based) on guide pins. The main thin is that petroleum based greases are not used because the guide rubbers may swell.

Regarding original shocks I've always thought they are made by Sachs or Delphi depending on manufacturing time.
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  #8  
Old 11-07-2020, 05:03 PM
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I’ve always known not to use petroleum on rubber, but with that said, I have also always been a LIGHT greaser myself and never in 40+ vehicles have I had an issue. I guess I can add that up to always being a very light coating and always using full synthetic high temp grease... dunno, but I can say I’m sure I’ve done thousands of sets of brakes, mine and others, and never had an issue.

That said I can see how someone may use bearing grease or something petroleum based or cheap and have it “gum up”, you know what I’m talking about, when it gets thick and chunky, I can see that boogering up a caliper slide for sure.


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  #9  
Old 11-10-2020, 02:11 PM
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Replace the boots on brake pad replacement time and you can't go wrong on either approach. They are so cheap.
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