I am replacing my brake pads and rotors this weekend on my E36 and I'm just curious if it is good to have the new rotors turned before I install them? Or do they come from the factory full ready and good to install? :help

I don't want to have an uneven breaking in period on my new brakes and need to get the rotors turned a couple weeks later, so I wanted to check before I actually do it.

Thanks in advance. :thumbup:

There's no reason to have OE or other high quality rotors turned before intalling them. And given that the allowable wear on BMW rotors is only 1mm/side, turning them only reduced their life.

Bedding the pads is pretty easy. For OE or low-dut pads about four repititions of full force (just short of ABS intervention) decelerations from 60 to 20mph followed by 10-15 minutes of driving at 50mph or better with no use of the brakes will properly bed in the pads.

There's no reason to have OE or other high quality rotors turned before intalling them. And given that the allowable wear on BMW rotors is only 1mm/side, turning them only reduced their life.

Bedding the pads is pretty easy. For OE or low-dut pads about four repititions of full force (just short of ABS intervention) decelerations from 60 to 20mph followed by 10-15 minutes of driving at 50mph or better with no use of the brakes will properly bed in the pads.
Thanks for the information.:thumbup: Is there any other write-ups on the bedding anywhere? I've never done this. Where can I do something like this? Find an empty street or...? :confused

Edit - i was searching for bedding.. came across these links. I figured I should quote them in this thread just for future searchers on this topic. :)
"bedding" your brake pads - here are some links:

http://www.tirerack.com/brakes/tech/techpage.jsp?techid=85

http://www.pagidusa.com/bedding_in_procedure.htm

http://www.zeckhausen.com/bedding_in_brakes.htm is a good write up on the process. It a bit more geared to high performance brakes, but the process is the same for ordinary pads. You just need a few less repititions.

^^^^^^^^^^^^^^^^^

That is a very good write up, bedding is more important than people think.

Very true! And re-bedding pads can cure what appears to the uninitiated to be warped rotors.

Hard use of the brakes followed by insufficient cool down driving before stopping the car can result in pad imprints being left on the rotors. This will cause a vibration in the brake pedal (and steering wheel) that is frequently mistaken for warped rotors. Re-bedding will even out that imprint and reduce the vibration.

Wow.. great info. I have never done this before.. :eek:

Then again, Ive only changed brake pads once in my life and it was on my 97 Chevy Z-71 truck. I never had any problems with that thing.

I will be doing this on my car now. Thanks for the info. :thumbup: