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E85 / E86 Z4 (2003-2008)
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Old 04-20-2017, 12:16 AM
BMWz4e85 BMWz4e85 is offline
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Mein Auto: Z4
Front Control Arm Setup - e85 3.0si

Hi all,

I am experiencing issues, and I believe it related to the control arms. At random times when turning I do hear a squealing noise, and upon breaking the steering wheel does vibrate/shake.

Would this indicate an issue with the lower control arm/caster arm? And does the z4 come with an upper control arm as I couldn't see anything on this.

I am thinking to replace the entire arm as it comes with the bushes and ball joints.
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Old 04-20-2017, 03:57 AM
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BostonB6 BostonB6 is offline
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Mein Auto: 2005 E85 Z4 3.0
Not saying your LCAB's don't need replacing but vibration when braking is usually a signed of warped brake rotors and squealing when turning could be wheel bearings. Might want to get a proper diagnosis before throwing $$$ at the wrong problem.
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Old 04-20-2017, 05:05 AM
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dc_wright dc_wright is offline
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Mein Auto: '06 Z4 3.0si, '11 128CiC
Definitely sounds like a brake issue to me. As B6 indicated likely some rotor warpage.

With respect to wheel bearings and squeal, the bearings on BMWs are relatively large and they give off a rumble or roaring noise that varies with vehicle speed. The only time I've seen where a squeal came due to a bearing issue was on a car that had a bad rear wheel bearing that was so bad that it was allowing the rotor to contact the caliper bracket. That metal to metal contact was causing a squeal.

There's no upper control arm since it's a McPherson strut suspension in the front. When/if you do need to replace the control arms that's a nice setup you found with the bushings already pressed in place, assuming they're oriented to the position they'd be in when the car isn't on a lift. Also you have to replace the whole arm as the ball joints aren't replaceable by themselves in the factory or equivalent control arms. Meyle claims to make a control arm with heavy duty ball joints that are replaceable, but I've seen a fair amount of complaints about them having short life on E36s.
2006 Z4 3.0si Sport Package (But I'll still hang with my "homies" in the E36 forum)

Last edited by dc_wright; 04-20-2017 at 05:14 AM.
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Old 04-22-2017, 02:46 AM
BMWz4e85 BMWz4e85 is offline
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Location: Australia
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Mein Auto: Z4
- Driver side rotor is more worn than the passenger
- LCA bushing seems abit worn??
- Bump stop on the driver side seems to bottom out
- The squealing sound is coming from the driver side

I have checked the rotor, LCA, and suspension parts and here is what I have found.

Passenger side: 27mm
Driver side: 24mm

There was abit of play when I tried to lift the wheel up and down. Which I think is normal? I did hear squeaking sounds when I was taking the nut off the car though (likely to be LCA). Condition abit worn.

Springs/bump stop
I notice on the driver side that the bump stop has been bottoming out? Probably because its the driver side (I don't usually have passengers). I have tried bouncing the car from the driver corner and the car is quite stable, which would suggest the shocks are still ok.

Any suggestions on where to look next? To be honest, the car has performed 140k and it probably best to change the rotor and possible the entire LCA from the way I see it.

Last edited by BMWz4e85; 04-22-2017 at 02:49 AM.
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