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Suspension & Braking Forum by BimmerWorld
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Old 05-22-2014, 12:13 PM   #1
DMahoney
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Join Date: Oct 2010
Location: Boston
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My Ride: 2001 325ci
Help: Compare these two RSM's

Is the rubber difference weird to anyone else? I'm trying to diagnose a knocking noise and I recently replaced almost every bushing & arm in the suspension for preventative maintenance but now I have this noise. It was checked out and deemed safe but an "annoyance". I have a future appointment somewhere else. But Do these shock mounts look weird to anyone else:

Left RSM:
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Right RSM:
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ID:	559374


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Old 05-23-2014, 04:12 PM   #2
Minnoe07
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Looks like both your rear shock mounts are broken. Try moving around the top of the shock. If it moves and makes a knocking noise when you hit the side of the shock mount tower, there is your problem.

Also, you either need to replace with upgraded ones or are missing a washer that prevents that from happening.
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Old 05-23-2014, 04:15 PM   #3
DMahoney
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I purchased new hd rear shock mounts with reinforcement plates. As well as all the hardware. As for my braking noise that stops when I hit the brake, or begins when I let off the brake, does this picture look funny to anyone

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Old 05-23-2014, 10:35 PM   #4
DMahoney
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I can't tell if there is a knocking noise coming from it when I try to push it with my hand. If I grab the back of the trunk when it is open above the bumper, and push the car up and down I hear the noise only when I push vigorously. At the same time, I noticed that the shock mount moves up and down. Not drastically like the shock is popping up and down but the rubber and washer at least move up and down. I'm not a mechanic but I am under the impression that these shock mounts I'm not supposed to move it all. Correct?


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Old 05-23-2014, 10:41 PM   #5
DMahoney
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My Ride: 2001 325ci
Help: Compare these two RSM's

Any thoughts:

Now I did take my wheel off and I put my hands on the wishbone, upper control arm, and jiggled it back-and-forth and I got a noise that was like a creek type knock. I can't pinpoint it but I put mobil one synthetic grease on the outer upper control arm bushing and swaybar link bushings. It seems to have decreased the sound a little bit. I'm going to drive tomorrow morning and check it out. All these bushings are brand-new and I don't see a crack on any of them but I'm thinking the rear sway bar could've been installed incorrectly or it could be too tight on that bracket that connects to the rear upper control arm. ??

I loosened the bolts a little but couldn't tell much. I am under the impression that there is a special way to install these rather than just bolting and un bolting. But it certainly seems like it could be a combination of the rear shock mount and this odd noise coming from the jiggling of the upper control arm in the rear..

If I jiggle the rear sway bar link it doesn't make the noise. Only when I grab the upper control on it it's sides and wiggle...?

Any thought.??


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Last edited by DMahoney; 05-23-2014 at 10:42 PM.
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Old 05-25-2014, 08:28 AM   #6
DMahoney
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My other issue ^ pleAse help


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Old 05-27-2014, 09:15 PM   #7
Minnoe07
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Please review a DIY on how to replace rear shock mounts and replace with the ones you just purchased. They are damaged and you need replacement. Shock mount and top of shock should not move when the suspension is being loaded and unloaded.

Get that done first and see if that solves all of your problems first.


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2004 330Ci 6 Speed; UUC Sway Bars; Powerflex RTAB's and FCAB's; KW V2 Coilovers; 3.38 OS Giken LSD
Z4 Finned Diff Cover; Headers; M-Tech II Rear Bumper and CF Diffusor; CF Trunk; CSL Front Bumper
M3 CF Hood; DICE I-Pod Kit; JTD Rear Shock Mounts; UUC Front Strut Bar; O2 Simulators
ESS TS2 Twin Screw Supercharger

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