[Moewron]

Originally Posted by Crazy1323

I don’t know if BMW also does this, but on my Audi if the car detects rain (using the sensor for the windshield wipers) it will automatically apply the brakes to “wipe” them about every 30 seconds. It is so slight you cannot even feel it, but I notice zero difference in braking performance wet vs. dry when driving. Obviously in the dry stopping performance will be better because the tires are dry, but I do not notice any difference in the braking.

Now after a car wash is a different story. Whenever I wash my car I always have to remember “the brakes are wet” when pulling the garage. It still stops, but takes more pedal than you are expecting, so it gives you one of those “heart attack moments” for a split second.

I was told by my coach/driver at the PCD in 2020 that BMWs do, in fact, do this.

Also, as far as brake dust goes- my 2014 3 series and 2017 m550 created a HELLISH amount of brake dust (at least to me, it seemed bad) with just normal commuter driving. Since those two cars, I have had an X5 45e and an iX M60. Having read this threat it caused me to realize that I had completely forgotten about break dust. There's very, VERY little on either of those cars. Based on that and what XM owners have posted here, I think the hybrid drive likely largely mitigates the brake dust factor.

[Crazy1323]

Originally Posted by Moewron

I was told by my coach/driver at the PCD in 2020 that BMWs do, in fact, do this.

Also, as far as brake dust goes- my 2014 3 series and 2017 m550 created a HELLISH amount of brake dust (at least to me, it seemed bad) with just normal commuter driving. Since those two cars, I have had an X5 45e and an iX M60. Having read this threat it caused me to realize that I had completely forgotten about break dust. There's very, VERY little on either of those cars. Based on that and what XM owners have posted here, I think the hybrid drive likely largely mitigates the brake dust factor.

That is exactly what I was looking for. I would imagine with the regen that the mechanical brakes won’t be used too often, so little brake dust and wear.

However, the two most important masses to reduce are unsprung and rotating masses. CCB’s are a chance to remove 50-ish pounds of rotating AND unsprung mass. That makes a vehicle handle, ride, accelerate, and brake better.

For me, losing that much unsprung rotating mass is worth it, plus gold looks really good

[evanevery]

IMHO: CCB's are a must for ANY street car where you want to keep the wheels clean...

[iifymbro]

Originally Posted by evanevery

IMHO: CCB's are a must for ANY street car where you want to keep the wheels clean...

just gotta swap pads to a ceramic set, was one of the first things I did on my g87. I would 100% get CCB on the G90 though, go big or go home.

[evanevery]

Originally Posted by iifymbro

just gotta swap pads to a ceramic set, was one of the first things I did on my g87. I would 100% get CCB on the G90 though, go big or go home.

"Ceramic" pads don't get the job done. You still have iron rotors and friction still generates iron brake dust.

[iifymbro]

Originally Posted by evanevery

"Ceramic" pads don't get the job done. You still have iron rotors and friction still generates iron brake dust.

it's way better, I'd say like 80-90% improved. I kept the stock rears on for awhile and the difference between front and rear wheels is hilarious after a few hundred miles, even though the rears are much smaller pads.

[Alan l.]

"Dustless" pads help a ton but I would be lying if i said they still don't generate a lot of dust. I had the isweep and now EBC Reds and they help alot but i still find myself cleaning the wheels almost daily because OCD. They also help with noise. My oem pads sounded like a old school bus where as the aftermarket pads are silent 99% of the time.

I'm only considering ticking off the CCB option for two reasons 1) less brake dust and 2) they look awesome.

I can't stand dirty wheels so i tend to wipe my wheels down almost every day in my garage. Not having to do that is a game changer for me.