Vibration under mild braking at 80 mph

[over5teer46]

Gentlemen, I got a 2018 M3 with 16000 miles. Like the title says it is very noticeable at that condition, especially mild/gentle braking at or above 80 mph. Doesn’t happen at around 60ish or below.

Anyone knows a fix for this? And I am still on stock MPSS.

Thanks!

[mbudz]

Measure the rotor run-out and see if they are warped. That's where I would start.

Mike

[LVI]

Originally Posted by mbudz

Measure the rotor run-out and see if they are warped. That's where I would start.

Mike

+1

That would be my guess as well.

[idrg2016]

Do you have spacers on?

[Ropes]

Most likely not warped but uneven pad deposits which will feel like they are warped

[over5teer46]

No spacers. Thank you everyone!

[BzsBimmer]

Originally Posted by Ropes

Most likely not warped but uneven pad deposits which will feel like they are warped

^ this
Most people think that rotor wobble is warpage.
1. Check balance on wheels. Could be wheel weight or bent wheel
2. Remove wheels and check for proper seating against wheel hubs
3. Check rotor thickness against the MIN stamped on rotor
4. Try swapping out with some track pads and do a bed in procedure

Those are just a few that come into mind

[FlyingLow78]

I had a similar issue due to pad deposits on the rear rotors. The compound that BMW spec’d from Brembo has a tendency to smear on the rotor face, especially when exposed to road anti-icing liquids. Switching to a little more aggressive pad cleared that up.