Vibration over 100 KMPH

[vikki2sharp]

Dears,

I am feeling very strange issues these days. Whenever the Car speed exceeds 100 KPH, the vehicle starts to vibrate vigorously. Up to 80KPH, things are cool.

Any pointers, I have already checked the alignment ans tires and they are OK.

Thanks

[Verynice]

re-balance the front wheels

[sweefu]

Checked your front rotors for warping or uneven wear? Front suspension, castor bushes? Steering rack?

[Kernal]

Before you spend any money check your tyres. Alternate your spare between all 4 and take it for a drive.

This happened to me once. I found out which tyre it was and replaced it.

[danieLOL]

this happened to me too, turned out to be warped rotors..

[vikki2sharp]

Thanks for the valuable comments. Can I swap the tires i.e., swap front and back tires on alternate position ?

[VYMAD]

Thanks for the valuable comments. Can I swap the tires i.e., swap front and back tires on alternate position ?

If they're directional then you'll have to keep them on the same side, as in driver's side front to driver's side back.
If not directional, then you can rotate them, as in driver's side front to pasenger's side rear. This is the best option, if they're not directional tyres.

[vikki2sharp]

Well I had to change one tire, all tire balancing and final alignment and things are great .. Thanks for the comments

Though I do feel steering vibration when I apply brakes, specially at high speeds

[Sean880]

Well I had to change one tire, all tire balancing and final alignment and things are great .. Thanks for the comments

Though I do feel steering vibration when I apply brakes, specially at high speeds

The vibration on braking is brake shudder which is frequently caused by brake disc thickness variation. A pretty common issue. Next time you replace the brake pads ensure the brake discs are machined or preferably replace them with new items. New discs for Commodores are not expensive but will be necessary if machining the old discs would result in less than minimum disc thickness being retained. (Given the minor difference in price between machining and replacing a disc here you might just as well fit new ones.) Fitting of the brake disc must be perfect otherwise the brake shudder problem will recur eventually as the brake pad contact area on the disc surface wears.

There is much technical information available on this subject. Here is just one you may like to read as a guide.

Common Brake Disc Information TB 01