I think it ate too many brakes.
I have my lovely 2001 E46 325i auto car with doors and everything. Saturday I come to use it after a week or so of no use and it didn't roll backwards in R for reverse. So I added a small amount of throttle and it unstuck and went. I hadn't left handbrake on so I thought "oh."
Then as I trundled down my road with trees and everything I could hear a clunk clunk in time with wheel revolution (it has wheels too). And when I depressed the brake pedal it pulsed back at me and wobbled to a halt.
As I was insistent upon using the car that day I decided it might be pad stuck on disc and left deposits or whatnot. So I did some gradually higher speed braking in a safe environment (padded cell) and it got a lot better.
Anyway I then went about my business of helping people and rescuing them from wells. When I returned home my rear nearside wheel was toasty.
My diagnosis murder is a binding caliper (I think it had that problem on other side before I got it), and I'm edging towards investigating it myself, however as I need car soon for a trip I'm taking it to my local bmw specialists on the morrow. If they say it just needs a caliper refurb and the disc is OK then I may do it myself... but as I used it for a while I'm thinking the disc is probably pooped too if there have been deposits. And i'm less eager to start hammering at corroded discs.
Anyway yeah it's a whine as I managed to also have my bike temporarily off the road as I await my MOT appointment! And now I'm waiting for my brother to pick me up and his driving I put it to you is... aggressive. And off we will go north to the grey middle lands for a day of despair.