[Artemis]

Originally Posted by dsforman13

If we're talking about the same thing, I get the same noise "pop" only after washing the car and letting it sit over night. I put the car in drive and it doesn't move. Give it a little more gas and it "pops" free. almost like something was locked. Thought i broke the cars. Everything is fine afterwards. no dash lights or strange noises while driving.

Originally Posted by dsforman13

For me, its not when im driving. this is starting the car for the first time after being washed. not while im driving. if my car sit over night after being washed, when i start the car in the morning, put it in drive, the car rev's but doesnt move. when i apply more power, it pops and seems to break free. i read the link posted above and seem to understand what it is. Seems like something BMW should have addressed. I'm sure they experienced it while either driving in the rain or cold weather testing snow. Seems like im not the only one. Not that worried about it guess.

Affirmative. The 'pop' only happens when I take my car for a drive after a couple of days or weeks after having parked my car with wet brakes (after washing or a drive in the rain/drizzle/snow). As I said before, the 'pop' (or 'bang') is the sound of 'ending the kiss' between brake pads and rotors.

The cringy part is when you feel that, after firing up the engine, the car does not move despite the gentle tick on the throttle for triggering the 'Low Speed Assistant' (activating 'creep mode' with an M-DCT) in reverse. You give a bit more gas and you know that the 'pop' is about to happen, setting you free (release). As if you're breaking something. But there is no alternative.

Originally Posted by AlpsRider

I think that the rough dragging noise is corrosion on the disks. It wears off after a few seconds.

Affirmative.

You'll notice folks around you with the facial expression "oops, that ain't sounding right", while that initial dragging noise is nothing to worry about. It rubs off after some regular braking - doesn't take long before things get back to normal and no aggressive braking required. It's more outspoken with the 2NH brakes than with the regular OG M2 and standard M2C brakes.

To get you an idea about the size difference between 2NH brakes (standard on M2 CS - optional on M2C) and standard brakes on the OG M2/M2C (all made by Brembo):

Originally Posted by Artemis

I guess your M2C featured standard brakes (blue) ?

OG M2 brakes and standard M2C brakes are identical (blue).

M2 CS 2NH brakes (standard) and M2C 2NH brakes (optional) are identical, except for the caliper color (red versus grey).

BMW/Brembo 2NH front brake calipers (optional on M2C - standard on M2 CS)


Size difference of the 2NH front brake pads (made by Brembo & Pagid for BMW):


Rear:


Differences (video):