Rear Left Suspension Bucking

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FlyMike_88
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Rear Left Suspension Bucking

Unread post by FlyMike_88 »

Evening all,

I'll try and describe this as best I can!

My C5 X7 Exclusive Tourer (83k miles 59 plate) rides very well on the motorway and over slowly undulating roads, soaks them up like no other car I have owned. When I slow down and go over a speed bump or similar bump in the road, I can feel the rear left of the car almost buck. That side goes completely firm and I can feel it in the car. I'm going to get it up on the jack tomorrow but any initial thoughts on where to be looking?

The car raises and lowers seemly okay when operated with the buttons.

I've read a little about checking the height correction adjuster and possibly changing the sphere on that side?

Thanks for all the help so far by the way, very useful resource this forum!

Mike

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xantia_v6
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Re: Rear Left Suspension Bucking

Unread post by xantia_v6 »

It sounds like a failed corner sphere. You could try swapping the left and right spheres to see if the fault moves.

FlyMike_88
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Re: Rear Left Suspension Bucking

Unread post by FlyMike_88 »

Thanks! I’ve ordered a new rear sphere and tool. I’ll replace the offending side and report back if it solves the problem.

Mike

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Re: Rear Left Suspension Bucking

Unread post by Hell Razor5543 »

It could be worth considering replacing ALL of the spheres if changing the suspect one resolves the issue.

FlyMike_88
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Re: Rear Left Suspension Bucking

Unread post by FlyMike_88 »

So I have purchased a sphere removal tool and 2 rear spheres.

Can this be done DIY or does it require a garage to do the work?

I have a jack and axle stands. My understanding is:

Lower car to lowest setting
Cap off of LHD (leave for 10/15 mins)
Slowly loosen sphere (leave for 5 mins)
Remove sphere, watch for spillage
Relube new seal with fluid
Replace new sphere
Lower car and cycle system.

Is this correct?

Thanks,

Mike

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GiveMeABreak
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Re: Rear Left Suspension Bucking

Unread post by GiveMeABreak »

No Mike.

The system needs depressurising first all or it will be the fastest way you have travelled to the next County!

You have several options, depending on whether you have a Lexia / Diagbox diagnostic kit or not.

A) If you have such a kit, you can depressurise the whole suspension system using this method:
  • Start the engine.
  • Set the height control to the "LOW" position.
  • Wait for the vehicle height to be in the required position.
  • Stop the engine.
  • Connect diagnostic tool to the vehicle’s diagnostic socket.
  • Switch on the ignition.
  • Carry out an global test.
  • Go into the menu:
  • Suspension
  • Depressurising the system
Follow the instructions displayed on the screen. Wait for the vehicle’s suspension to sink completely - This can take at least 3 minutes.
Switch off the ignition & Disconnect the battery. This is essential, as the suspension system is active with the ignition off and if a door is opened it will trigger the system to operate!

B) If you don't have a kit, you can manually depressurise the front or rear axles independently, depending on the spheres you are replacing.

Disconnect the battery.
Raise the vehicle and support on axle stands, wheels free.
Depressurising the front axle
Kenny Front.PNG
Depressurising the rear axle
Kenny Rear.PNG
  • Place a hose on the pressure release screw (1).
  • Gradually unscrew the pressure release screw (1).
  • Wait for the pressure in the hydraulic circuit to fall fully.
  • Place a hose on the pressure release screw (2).
  • Gradually unscrew the pressure release screw (2).
  • Wait for the pressure in the hydraulic circuit to fall fully.
You will loose fluid, so don't re-use any reclaimed LDS that comes out, so make sure you have sufficient new LDS fluid to hand.

BSI Reset / Battery Disconnect / Reconnect Procedure

FlyMike_88
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Re: Rear Left Suspension Bucking

Unread post by FlyMike_88 »

Thanks Marc, don’t want to be traveling to the next county haha.

If I was to buy, where is the best place to buy Lexia and DiagBox software? I’ve seen a thread about forum member discount at EasyDiagnostic?

Thanks, Mike

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GiveMeABreak
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Re: Rear Left Suspension Bucking

Unread post by GiveMeABreak »

Yes indeed, here is the link:

viewtopic.php?f=51&t=60112

Follow the guide and I will be able to sort that for you if required.