BMW E32 vibration while driving
Why does the E32 vibrate at 70-100 km/h?
The most common causes are wheel imbalance, incorrect wheel centring, loose suspension bushings and a worn propshaft. Check the tyres and wheels first, as that is the cheapest. Sand collected inside the rim can unbalance the wheel.
Can the wheel centre bore cause vibration?
Yes. If the wheel's centre bore is larger than the hub, the wheel does not centre and the car shakes at about 80-90 km/h. The E32 centre bore is 72.5 mm. The solution is centring rings, and it is worth checking that the tyres are round.
Which suspension parts cause vibration?
A loose lower ball joint or worn lower control arms shake the front end. The front axle radius arm bushings soften without looking broken and cause shaking. A loose rear joint on the propshaft vibrates from the rear. Sticking brake caliper pistons and broken gearbox mounts can also cause vibration.