It is easy to replace the brakes if you know what you are doing. Even on cars like BMW's and Nissan's, the brakes are easily replaced.
You didn't even post which BMW you are working on. It is hard to know your level of mechanical competence, but from the way you asked the question the best thing is to take the car to a mechanic and pay them to do it. If you insist on doing it yourself, buy the correct Bentley manual for your BMW. You can see the list of books here: http://www.bentleypublishers.com/bmw Buy it from Amazon or your local bookstore. BMW brakes are much like the disc brakes on any modern car. The biggest difference is the parking brakes are inside the rear disks.
Your brakes are getting low and you need to replace them.
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The average cost to replace brakes on your 2004 Subaru is $70 per wheel. The cost to replace brakes will vary depending on several factors.
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Have to replace the brake sensors once you change the brakes and the computer will reset itself after a few minutes.
£170 As i can presume
To replace your brakes it could cost you anywhere from less than one hundred dollars to a little over three hundred dollars. The price to replace your brakes will vary depending on the make and model of your car.
about 20 to 40$ depends if u find somewhere that does it or the BMW dealership
There is no need to spend the money if it doesn't need done. Typically your rotors last longer than your brakes do anyway, so you should be fine for a while.
much did it end up costing?