stevebez

So been having a bit of an issue with my car and vibration under braking from 'speed' and generally vibration at ~70-90mph range.

The vibration at 80mph was resolved with road force wheel balancing of the FRONT tyres despite no shimmy in steering wheel felt at all. In the end all 4 were road force balanced - but the fronts were the culprits.

The braking issue was first thought to be warped rotors or poorly fitted rotors. I checked all that and looked all fine and re-seated the rotors for good measure. I then discovered some play in the front bearing. Test by holding the wheel at 12 and 6 and simultaneously pulling and pushing both points into and away from the car. RHS was a definite but light clicking, the wheel almost not even seen to visibly move. The left similar but less so (almost undetectable but was still there) - curiously there was no clicking detected when doing the same procedure from position 3 & 9 on the wheels. Recalibrated the front bearings (a few videos on this out there), and car is back to silky smooth at speed and braking. I had to rotate the rhs bearing retainer maybe 1/4 turn to recalibrate it and the lhs about 1/8 of a turn as a guide.

I was quite surprised at the bearing wear as the car only has 26k miles on it - but in the end was a super easy fix. Can't tell you how smooth the car feels now - thrilled to bits.

So just a heads up if you are facing similar vibrations ... road force balancing and be sure to check bearings before you tear into replacing bushings.

Plutoe

Bad rotors!

stevebez

Well, I thought so too, but in this case it was the bearings.

Exotic-metal55

Glad you found the problem. Did you change both inner and outer bearings or exactly what bearing was it?