steering wobble

[melbs]

If you have replaced the various bushes and had the geometry set up and the tyres balanced on more than one ocassion then you have to be looking elsewhere.

Have you checked for play in the wheel bearings?

Brakes and calipers are typically at fault if it occurs while braking, but you indicate while driving too? Have you checked to see if one is getting warm to indicate perhaps binding at a single high point.

Perhaps new rotors/discs, but I hate advocating such spend without reason. So much easier to diagnose 'real' than keyboard

have yet to check the wheel bearings and tie rods again. actually haven't been able to have my car checked again.

yes i indicated there's wobble while driving too initially, however after my initial repairs and work done, it now only occurs while braking.

i actually replaced my rotors and pads before I had my control arm bushings replaced, less than 4k kilometers so far for the rotors, so it shouldn't be too thin to be machined and refaced hopefully.

have yet to check for binding as i haven't been using the car as often, when my break from work arrives, will have time for the zed

 

[melbs]

Have you tried turning DSC/DTC off when braking!? I'd not trust anything 100% to be not interfering with the brakes all the time... that potentially is.

Sounds like warped discs but unless the pads are in contact with the disc then you shouldn't feel it, hence wondering if it's the dsc stuff.

Didn't a member a few months since have issues with his car wobbling and the dealer said they had tried different wheels, but it didn't solve it, however, upon a SECOND wheel swap (ie, the first one, and the dealer lied about doing the first) the issue went away. Ie, his wheels were bent and even with balancing were still wobbly!

Dave

yup tried dsc off, dtc on, dsc and dtc off all produced the wobble

tried a total of 3 sets of rims and all had wobbles, but not a good problem eliminator since they're all older than my 107s and wasn't able to check at the tire shop if the older sets were round and balanced. hard for me to get a hold of a new rims and tires to test understandably, hehehehe

 

[melbs]

I'm sure it's possible to balance out a slightly 'bent' wheel but it will still shake/vibrate under general driving conditions. Any local Z4 owners that could swap wheels with?

not that many zeds here unfortunately

 

[melbs]

I have a question though,

If I have a warped rotor, won't I feel the wobble/pulse/shake more in the brake pedal than steering wheel?

I drove another vehicle recently and it was obvious and apparent that the vehicle has warped rotors since the brake pedal was pulsating (pls note car has no abs so its not the abs, and pulsating feel is at any speed as long as brakes are applied) and as I assumed, the vehicle's rotors were refaced and new pads placed and the pedal pulsating feel and wobble were gone after.

The vehicle however is an SUV and has large tires, is it possible that the large tires offset the pulsating/wobble/shake feel of the steering that i could not feel it in the steering wheel?

And in the zed its the other way around, 18s with thin sidewalls + minor warped discs translate to magnified wobbly steering but not as evident in the pedal?

Or they really should be hand in hand? Warped rotors = wobbly/pulsating steering wheel and brake pedal during braking?

 

[melbs]

Just an update, had my front rotors and pads changed last month to EBC 3GD and greenstuff and the effect was no more wobbly steering while braking. I guess i warped my recently replaced oem rotors during my track runs past year.