Vibration in the cabin at high speed

[Mirko98]

I recently bought a bmw 123d and the previous owner fitted it with a cat less down pipe and has had the back box of the exhaust removed the cars runs fine but sometimes after parked up for a few days it will give off a very loud drone sound and vibration in the cabin when on motorway at 70mph+ speeds once I come off the throttle to around 60 it stops does anyone know what it could be I've just had the wheels balanced but it's not solved the issue

[Crackie]

My money is on it being a sticking rear brake caliper.

Have a look at the comments on this PH thread. https://www.pistonheads.com/gassing/topic.asp?t=16...

I had the same symptoms as you describe on my E92 335i............it was also a corroded and sticking ear brake caliper.

HTH.

[bodhi]

If the car is vibrating but the steering is fine it's a sticking caliper as mentioned, I had exactly the same on my 125i.