Lowered suspension

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Stuart123456789
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Lowered suspension

Post by Stuart123456789 » Wed Dec 19, 2018 7:41 pm

Just wondering if there is one common reason why my 2016 caddy has developed a knocking noise from the rear after lowering it on v max . Makes a noise as if the ply in the back is bouncing but it isn’t that any help would be appreciated Van has only done 17k so I’d like to think it isn’t any kind of suspension bush etc

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Re: Lowered suspension

Post by R29GAM » Thu Dec 20, 2018 7:16 am

Have you checked underneath? I’ve heard stories of the exhaust catching on the axle when lowered? It could just ‘sound’ like its coming from the panels?
Hope you find it.

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Barbel330
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Re: Lowered suspension

Post by Barbel330 » Thu Dec 20, 2018 6:12 pm

Check exhaust as mentioned, also check that the bump stops have been cut down or it could knock when you hit a bump. Some vmaxx rear shocks have had a knock in the past so could be a shock absorber.
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Stuart123456789
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Re: Lowered suspension

Post by Stuart123456789 » Sun Dec 23, 2018 6:40 pm

Thanks will be getting it up in the air over the festive period to check

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Re: Lowered suspension

Post by Stuart123456789 » Fri Jan 11, 2019 10:03 pm

Had my van up on a ramp today no play anywhere plenty on clearance with regards the exhaust is it possible it’s the shocks even tho it’s not visually evident ?

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Doc
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Re: Lowered suspension

Post by Doc » Fri Jan 11, 2019 10:15 pm

The KW V1 and GAZ rear shocks used to be supplied with the wrong size top bush.
The shock top bolts are M14 and the hole in the bush is made with just a little bit too much clearance, leaving a rattling/tapping/banging sound from the rear as the shock movement pushes/pulls the bush about the bolt. The forces and distances involved are very difficult to reenact by hand when trying to find the knock source.
Maybe your V-Maxx have the same problem.
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Re: Lowered suspension

Post by Stuart123456789 » Fri Jan 11, 2019 10:31 pm

Any suggestions or maybe a link to what shocks I should be replacing them with ? Do they need to be short shocks ? Thanks in advance

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Doc
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Re: Lowered suspension

Post by Doc » Fri Jan 11, 2019 10:44 pm

Prove that my suggestion is the case by dropping both shocks off and go for a drive.
My Gaz rears have been good, I've not had banging ever since I fitted them 18 months ago.
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Re: Lowered suspension

Post by Drew2k » Sun Jan 13, 2019 5:52 pm

Would you need to replace the shocks if this is found to be the source of the noise or is there any top mount bush that would stop it?! If it is just that the bush is the wrong size? Polybush?

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Re: Lowered suspension

Post by Doc » Sun Jan 13, 2019 6:08 pm

The V-Maxx shocks have a rubber bush but I guess you could get a polymer bush made if you deemed them worth that effort.

I'd first off try your V-Maxx supplier on their 2 year warranty but definitely don't hold your breath as most will fob you off with the fact that V-Maxx don't entertain warranty claims. Your warranty is with the supplier, not the manufacturer.
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Re: Lowered suspension

Post by Drew2k » Sun Jan 13, 2019 6:45 pm

Or could a larger bolt be used? To fill it out or would this obviously mean drilling out to accommodate or am I talking pap?

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Re: Lowered suspension

Post by Doc » Sun Jan 13, 2019 6:53 pm

The shock top bolt screws into a captive insert in the chassis rail.
You could remove the metal sleeve from the bush and have a replacement made to fit snug on the bolt, but that's more work than those V-Maxx shocks deserve.
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Re: Lowered suspension

Post by 92rivage » Tue Jan 15, 2019 8:29 pm

Could you not fit a shouldered bolt to the mount if that is the knocking? Much like you would fitting Vauxhall’s brake calipers to Mk2 Golfs etc.

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Re: Lowered suspension

Post by Doc » Tue Jan 15, 2019 8:38 pm

The problem is the 14mm bolt in a 14.3mm (At a guess) hole where the loading is a sheer force on the bolt and constantly applying a motion across the bolts axis.
It may only be something small like 0.3mm but it is still gonna make a hell of a racket when it's acting directly onto your chassis rail.
From memory, the original bolt doe shave a shoulder anyway but that is to prevent the shock slipping off if the bush fails.
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I have genuine VCDS Hex V2, VagCAN Pro, KESS, K-Tag for any of your programming needs.

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