Vibration above 70

[joe1145]

sunbeam alpine said:

You may be able to check for sticky brakes - feel the wheels after you've driven - if one side is noticeably hotter than the other.

I have tried this but one wheel never seems any hotter, however this is usually after driving at lower speeds. I think i need to find a stretch of road that I can do 70 on and pull over from that speed and then check the temperatures.

[joe1145]

Ok so update to this. I have now stopped from 70+ into a layby on a dual carriageway and neither brake was obviously hotter than the other, neither seemed to be overly hot.

This does seem like a balancing issue as its worst around 80, above that it starts to disappear, and below 60 its gone completely.

However, I've never had an out of balance wheel cause shaking when braking, when driving along it is like an imbalance, but when braking the shaking is so much worse.

I'll see if I can borrow some wheels off someone and see if this makes a difference

[sunbeam alpine]

joe1145 said:

Ok so update to this. I have now stopped from 70+ into a layby on a dual carriageway and neither brake was obviously hotter than the other, neither seemed to be overly hot.

This does seem like a balancing issue as its worst around 80, above that it starts to disappear, and below 60 its gone completely.

However, I've never had an out of balance wheel cause shaking when braking, when driving along it is like an imbalance, but when braking the shaking is so much worse.

I'll see if I can borrow some wheels off someone and see if this makes a difference

Could it be a damaged/warped brake disc?

[joe1145]

I've considered this, perhaps its catching the brake hence the vibration at higher speeds, however i'd expect the brake to heat up. I managed to practically coast from 70 to 0 and I could touch both brake disks with my hand, neither were hot.

[E-bmw]

100% this is tyre/wheel related.

If you haven't got anything suitable find someone who has, you either need to swap wheels until you find which it is or spin them up on a balancer while watching the tyre/rim & you will find the issue.

You have been told this several times already, until you do this you WILL have the issue.

[Auntieroll]

Sounds like the carcass and the tread of one or both tyres has become delaminated .

Had similar symptoms years ago , totally flummoxed for a while , only found it when wheel balance was checked at another garage using an on car (Repco IIRC ) wheel balancer.

The modern wheel balancers don't spin fast enough to cause the bulge , perhaps if you can't find a garage using/with an old Repco or similar you could jack up the rear and spin the front tyres to speed up that way ?
HTH

[loggo]

If I recall correctly don't out of balance wheels cause of vibration around 40 as well as 70?

[RSTurboPaul]

loggo said:

If I recall correctly don't out of balance wheels cause of vibration around 40 as well as 70?

The speed where vibration present itself would surely be entirely dependent on the amount the wheel was out of balance?

[ninepoint2]

Damaged/Buckled wheel/s

[joe1145]

Im sure this is some kind of balance issue as it comes around 65-80 then goes, even if brakes were warped and touching the pad there would be some heat, only other thing perhaps the brake disk is out of balance but that seems highly unlikely to me.

The front tyres are quite worn on the inside so I can justify replacing them