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Rear Suspension Sway going over bumps
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citroenroen1   
Sun Jun 08 2025, 04:46am
Joined: Apr 18 2024
Member No: #5495
Location: Los Angeles
 I notice a "sway" from the rear end of my 2006 C6 when I drive over bumps.
I got under the C6 / jacked it up , checked rear wheel bearings and rear bushes for play , checked the long right and left dog bones which have rubber bushes at both ends and nothing seems worn or out of place.

Whatever can be worn in the rear suspension that causes the rear end to sway (when going over bumps) ?

I have no suspension noises going over bumps.

Is there a parts drawing showing all the possible bushings that may be worn? What should I be looking at ?
Hattershaun   
Wed Jun 11 2025, 08:34am

Joined: Dec 19 2010
Member No: #320
Location: Bedfordshire, UK
 I’d be checking the gas pressure in all the suspension spheres, if all the suspension hardware checks out OK.
Overtime the pressures reduce, which affects the spring rate, different spring rates will mean each corner of the car absorbs bumps differently, leading to a sway.
citroenroen1   
Sat Jun 14 2025, 10:27pm
Joined: Apr 18 2024
Member No: #5495
Location: Los Angeles
 Thanks for your reply Hattershaun : SPHERES were replaced in 2023 (but that doesn't guarantee anything !)

What are rear suspension sphere pressures supposed to be ?

Other than depressurizing suspension , is there anything you can suggest to safely / easily remove rear suspension spheres ?
Hattershaun   
Sun Jun 15 2025, 05:13am

Joined: Dec 19 2010
Member No: #320
Location: Bedfordshire, UK
 I believe your C6 has 2.7HDi engine.
In which case Sphere pressures should be;
Front outer 50bar
Front centre 70b
Rear centre & outer 40b.

Check all the pressures, not just the rear.
None of the spheres have a damper valve built into the unit. Same pressures in all V6 engined C6.

2.2HDi four cylinder engine has a different Hydractive system, without the variable damping, so spheres & pressures are different.

There’s either a technical document on how to remove spheres or I’d search previous posts here or look for videos on You Tube.
 

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