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DISCO3.CO.UK > Technical (D3)

rapid knocking from the front

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Endeavour

Member Since: 03 Feb 2019
Location: Toronto
Posts: 132

rapid knocking from the front

the driving over potholes I get a rapid knocking sound, like a machine gun

bit annoying as its only just passed it's safety check earlier in the week

whats the most likely cause? ball joints?

10th Feb 2019 2:59 am

PROFSR G

Member Since: 06 Mar 2017
Location: Lost
Posts: 4628

2009 Discovery 3 TDV6 Commercial XS Auto Stornoway Grey

Does it happen under braking or all the time? yµ (idµ - eAµ) ψ=mψ

10th Feb 2019 3:32 am

Endeavour

Member Since: 03 Feb 2019
Location: Toronto
Posts: 132

happens if going over bumps/potholes - when both braking and not

not happening at other times

10th Feb 2019 1:11 pm

kajtzu

Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6568

2005 Discovery 3 4.4 V8 HSE Auto Cairns Blue

Drop link bushes are tired or/and lower front suspension bushes are shot.

10th Feb 2019 1:35 pm

Gareth
Site Moderator

Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26700

Mines doing the same under braking. Like a machine gun!

Accompanied by brake judder. Got MOT on 21st so will see what happens then.

I suspect it will need at least a front wishbone, possibly more because I took it along a rough track the other day and the steering felt very loose.

10th Feb 2019 3:21 pm

Endeavour

Member Since: 03 Feb 2019
Location: Toronto
Posts: 132

sway bar has some lateral movement in it

11th Feb 2019 8:07 pm

kajtzu

Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6568

Time to replace ARB bushes then.

11th Feb 2019 8:13 pm

Endeavour

Member Since: 03 Feb 2019
Location: Toronto
Posts: 132

will do.

I should go for the square shims as well right?

11th Feb 2019 8:18 pm

kajtzu

Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6568

Hmmm... I don’t have those and I replaced the ARB bushes front and rear 1 - 1 1/2 years ago. TBH I didn’t think the extra shims were needed anymore? Somehow I assumed that those were a stopgap measure at the time and the bushings were slightly different from some date forward. Mine are genuine.

11th Feb 2019 8:22 pm

Endeavour

Member Since: 03 Feb 2019
Location: Toronto
Posts: 132

i've ordered them anyway; they are $5 for the 4
as well as new bushings, brackets and bolts. So hope it warms up enough for me to fit them (working on a car outside in -20oC condition is not fun when your fingers stick to the chassis)

11th Feb 2019 8:42 pm

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