F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > Rear Shock Question
ARMA SPEED
Post Reply
 
Thread Tools Search this Thread
      10-16-2021, 05:53 PM   #1
Randy Johnson
BM3
171
Rep
566
Posts

Drives: BMW 435i GC M-Sport
Join Date: Sep 2019
Location: Miami FL

iTrader: (0)

Garage List
2015 BMW  [0.00]
Rear Shock Question

I noticed on my 435i that the rear shock bump stops have disintegrated. The bump stop is so far gone it no longer holds the plastic cover over the shock shaft. I was checking to see how hard removing the shocks are to replace the bump stops and noticed the shocks do not go back up when compressed. Is this normal on bmw? I've change a few suspensions in my time and the shock always would expand once compressed. Not sure if I should also replace the shocks. I have 61k miles. Car rides fine with no bounce.
__________________
435i GC M-Sport
Appreciate 0
      10-16-2021, 07:54 PM   #2
Orion4
Major
United_States
361
Rep
1,365
Posts

Drives: 2013 335i Sport Line Sedan
Join Date: Aug 2009
Location: Melbourne, FL

iTrader: (0)

61K miles on your suspension is in the range of starting to wear out. Depends on driving style and roads. The shocks not rebounding is a clear sign of failing/failed shocks. If your rears are going, there's a good bet the front struts are dead, too. I recently replaced my front struts and rear shocks with Bilstein B-4s from FCP Eur at 165K, but they were totally dead. Retains original ride height.
Appreciate 0
      10-16-2021, 09:09 PM   #3
Randy Johnson
BM3
171
Rep
566
Posts

Drives: BMW 435i GC M-Sport
Join Date: Sep 2019
Location: Miami FL

iTrader: (0)

Garage List
2015 BMW  [0.00]
Never had shock go bad so fast. Not sure if these are gas filled which would rebound faster than non gas. Shocks should not alter ride height unless the wrong ones where installed.
__________________
435i GC M-Sport
Appreciate 0
      10-17-2021, 11:50 AM   #4
Orion4
Major
United_States
361
Rep
1,365
Posts

Drives: 2013 335i Sport Line Sedan
Join Date: Aug 2009
Location: Melbourne, FL

iTrader: (0)

There are a number of shocks that will change ride height for the model. matching with the correct springs is required. As an example, Bilstein makes several.
Appreciate 0
      10-17-2021, 05:35 PM   #5
Orion4
Major
United_States
361
Rep
1,365
Posts

Drives: 2013 335i Sport Line Sedan
Join Date: Aug 2009
Location: Melbourne, FL

iTrader: (0)

BTW: all the BMW Struts/Shocks and related aftermarket are gas. Which are really a hybrid Hydraulic/gas (usually N2) for more responsive performance. The OEM struts/shocks on my 13 3335i were Sach. I think only vintage/classics cars may still use pure hydraulic for softer/smoother ride.
Appreciate 0
      10-17-2021, 10:23 PM   #6
johnung
Brigadier General
United_States
2375
Rep
3,219
Posts

Drives: 2015 BMW 335i x-Drive Auto
Join Date: Oct 2017
Location: New Jersey

iTrader: (0)

Garage List
Quote:
Originally Posted by Randy Johnson View Post
I noticed on my 435i that the rear shock bump stops have disintegrated. The bump stop is so far gone it no longer holds the plastic cover over the shock shaft. I was checking to see how hard removing the shocks are to replace the bump stops and noticed the shocks do not go back up when compressed. Is this normal on bmw? I've change a few suspensions in my time and the shock always would expand once compressed. Not sure if I should also replace the shocks. I have 61k miles. Car rides fine with no bounce.
The original shocks are really crap so not surprising at your mileage. IMO replace them with Koni Special Actives. Huge difference for a daily driver in comfort and sportiness
Appreciate 1
cfm56d7b3565.00
      10-18-2021, 12:06 PM   #7
cfm56d7b
Major General
United_States
3565
Rep
7,807
Posts

Drives: 2017 440i Gran Coupe & 2015 X5
Join Date: Nov 2012
Location: Orange County, CA

iTrader: (2)

OP, is the shock in question M Adaptive or regular?
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:08 PM.




f30post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST