I asked about this a while ago but not much response....
I find that if I hold the brake at a stop light, rather than using the "brake hold" that I feel the pedal sinking...
Service advisor found no leaks Anyone else have this

WOW I have the only MACAN that has this problem

What year and model? Do you think it might be color related? My Sapphire blue being the fastest color takes extra effort to reign it in to a stop.

Maybe rubber brake hoses expanding.

It's a 2019 S 17,000 miles and its Night (dark) Blue Metallic with dark windows ... (nasty)
I seriously doubt that the 3 year old brake lines are expanding...and it has not lost any fluid

Time for a brake fluid flush? What is the recommended interval for this service? It couldn’t hurt.

I believe the interval is every 2 years or every 20K mi, whichever comes first.

+1 for the fluid change.

I boiled the fluid in my 911TT doing some very spirited driving up and down Mt Palomar CA.

Pedal sank to the floor but recovered. Changed fluid when I got home. Problem gone.

Start with the fluid change, but could also be the master cylinder failing and leaking internally at the piston so you won't see any fluid on the ground.

It is more practically master cylinder oriented from my many years of motorcycle experience. Just changing it out usually did the job, plus bleeding, etc. Honing it out and new O-rings works, too but more labor intensive.

Yes, my opinion as well.

You're due for a brake fluid flush - 2 yr. limit reached.

Also, a sinking pedal sounds as though the pressure is not being held and that relates to master cylinder seal(s).

I'd go with brake fluid flush first and see if that fixes things.


Good luck!

I believe that the fluid was flushed at the 2 year service....

My Cayenne brake pedal will sink as I continue pressure, it is the hold feature sensor kicking on. Dunno if it is related, but that's how mine works. It holds when you lift your foot and will hold the spot until you touch the gas. For stop and go traffic and hill stops.