This wound up being temporary, but I wanted to get the car checked out. I took the car to my Porsche dealer and played this video to the service advisor.

He listened to it, looked at me, and with a perfect deadpan said: "That's normal."

At which point I burst out laughing (and so did he).

I'll post an update with the rest of the story tomorrow.

In the meantime, post your diagnosis!

 

Hard to tell from the video but it almost sounds like you flipped a small stone into one of the brake rotor/caliper and it was dragging.

 

I live on some gravely back roads and get this once in a while...... I even got this on the highway after driving through a repaving zone.

The 1st time it ever happened it scared the crap put of me..... thought I was dragging the exhaust or something it's so loud.

The pebble usually pops out by itself and/or pull off and and find a place to reverse for a short distance..... the pebble will come out.

One time I used a stick and just pushed lightly on the shield behind the rotor the pebble was stuck... to help to dislodge it.

 

reverse backwards and apply the brakes hard - that usually dislodges a pebble

 

Yup, those ---^

 

Pebble in the rotor, had this myself once and had the same response you did!

 

Agree with everyone else on the pebble. Happened to me as well. I just hit the brakes pretty hard and it went away.

 

Mine picked up a stone on way home one day, same sound as the OP video. I did the above and stone came out.

 

Wow. You guys know everything.

I never found the pebble; it was dislodged when I rolled in reverse.

There's very little clearance between the wheel and the calipers - and the PCCBs are massive. You can also see where the inside of the wheel has been scored by whatever got wedged in there.

Yes, I remembered to remove the penny.

 

A better view:

 

time to change rotors?

 

Happened to me on my GT3 and freaked me out too.

 

Me to in a Cayman S

 

I'am 100% sure that it is little stone between rotor and rotor metal cover, i agree that it is normal because my pzero's are like magnet for little stones

:-)

 

This happened to me DAILY in my M4. Very annoying. Like a tin can was dragging behind the car. Design issue.