[hunter8793]

I've got 4k miles on my 2022 with the steel rotors.

I've noticed and it is repeatable, while braking 55mph+ I can feel it in the brake peddle a nice shimmy/pulsating thing going on. I don't ever remember overheating the brakes to cause warping. I've never tracked the car. I've probably slowed down a few times from 130-85, but nothing really noteworthy.

Could it be my wheels need balancing again?
Do I just take it to the dealer? I've got new brake pads for it, for reduced brake dust ready to put on.

I really just hope its not the rotors, because if so, they are weak as crap.

I also had a 2019 M5 and put about 14k miles on it with no issues.

[pbonsalb]

Your rotors aren’t warped from the limited, gentle driving you do. Could be pad deposits on the rotors from that gentle driving. You could try removing them by going for a highway drive in a place and at a time when no one is around and stand on the brakes a few times from 120 mph down to 60 mph. I find that helps when my brakes squeak but it is really hard to remove pad deposits on rotors with modern factory street brake pads that lack metal compounds. The squeak during gentle low speed braking returns pretty quickly. I have not tried removing the rotors to resurface them but that would almost certainly help.

Wheel imbalance would show up all the time in the speed range at which it occurs, not just when braking.

Front tension strut bushings can cause shimmy when braking but it highly unlikely your bushings have deteriorated on a 22 with only 4K miles. Maybe 40k miles.

[hunter8793]

Thanks for the reply. I had a Dodge charger 392 with the 6 piston Brembo brakes. I had pad transfer on those rotors a few times. It was just visual. No shimmy.

I will try to brake harder and see if it goes away. Thanks

[hunter8793]

Well I went fast, now I have pad transfer on the rotors. Still shimmys. I'm going to schedule an appointment.

[hunter8793]

The dealer thinks it’s the rear rotors. They ordered new rotors and pads. I think it’s the fronts. They said that the rears always wear out before the fronts. My car has 4400 miles on it. This isn’t a wearing out issue. But the tech drove the car and said he felt it in the rear. So much for measuring the rotors or something to see if they are straight and true and not warped…

Hopefully they are right, but I feel like they are guessing.

[pbonsalb]

Interesting they say the rears wear out before the fronts. Must be a traction control thing. TC is very good so maybe it is acting much more than I thought. In the old days, meaning until a few years ago, the general consensus on brakes seemed to be that rears lasted about twice as long as fronts.

[hunter8793]

New rear rotors and pads seems to have solved my issue. I wonder what was wrong for them to do that within 4k miles.

Breaking them in now.

[shawnhayes]

Originally Posted by pbonsalb

Interesting they say the rears wear out before the fronts. Must be a traction control thing. TC is very good so maybe it is acting much more than I thought. In the old days, meaning until a few years ago, the general consensus on brakes seemed to be that rears lasted about twice as long as fronts.

On the Pre-LCI cars, this was ABSOLUTELY the case, even track driven in M Performance Mode. The car used the rear brakes to correct EVERYTHING. And that pad is very very small.

I replaced those stupid pads 2 times for every time I replaced the fronts on the 2018.

Shawn