These issues have to be anomalies. Otherwise everybody would be posting about something every day. Obviously some cars have problems. I guess it all comes down to how the dealership and Porsche handle these problems. As I stated the post on another thread I had three other porsches beside the one I have now. I have never had to replace brakes on any of them. I track my 997 multiple times and never had any issues. My 996 was sold to my friend who also tracked his car without issue. I never tracked my cayman but again never had any issues.

I guess when a company producing thousands of cars there are bound to be some bad ones. People with problems with their vehicles tend to complain quite a bit and this makes it seem like there are lots of cars with lots of problems. My hope is that this is not the case.

 

What??? why do all of this...is it a Porsche or from some 3rd world start up?

 

Yea, it's a Kia
It might sound excessive, to someone who does not understand braking systems.
However, it is just basic non abuse practice.
It's all 2nd nature to me.
Just like warming up your engine, before you run it at high revs and not shutting it down, with out an ample cool down period.

There is always PCCB, for those who want brakes that will take more thermal abuse.

My GF warps rotors like crazy, on her car, and she is the easiest driver ever.
I think its just driving style and being oblivious to the physics at play.
She must drag her brakes and keep her foot planted hard, in the pedal, when stopped. It only takes a light pedal or even no pedal to keep a car still at a light.
After a hard stop to a light, just rotate the disk for even cooling.
It only takes a few feet of space to roll the car forward a bit.

In my GF case it was pointless trying to explain any of this, so I bought her StopTech CryoTreated Rotors and Performance Friction "Z" pads (after replacing multiple OEM rotors/pads).
Problem has gone away.

The 911 has great OEM brakes, but some kind of unintentional abuse is happening, for this problem to keep repeating.
People track these cars, on stock brakes, and depending on driving style the brakes live or die.
It's all in how you treat the equipment, everything has a limit.

 

Agree with ignoring the nonsense to listen to people you would believe that what is a rather robust braking system is as fragile as a china doll.

But it isn't necessarily parts. Like some else mentioned, the OP may need to look back at himself.. especially after multiple failures.

There is a wide variety of ways people drive during everyday. Some people always hammer on the brakes and stop hard during normal stop and go, some people grew up driving crappy GM cars and learned to conserve their brakes and out of habit take it easy on them.. No one ever seems to want to admit they are at fault..

Strangely enough my wife seems to eat brakes and one ride with her explains why. Although I always tell her it must be the car

 

OP, sounds to me like something mechanically not functioning properly as part of the traction control system. There's likely a more technical term but I'm proposing the electronics that help control the handling may be improperly applying pressure that is wearing the rears to the point they overheat and wear prematurely. Of course the dealer should see this but my two cents. Good luck in the future.

 

So driving with traction control off for a control test .

 

OP - do you have PTV? First time, all 4 rotors, and 2nd time only rear. So, both times, rears warped. Just thinking through what might be special about the rears.

 

Rolling out after a hard stop is standard procedure...and just basic physics.

 

warped rotors are usually the drivers fault, caused by excessive heat or getting the rotors wet while they're hot. driving through a puddle after a few hard stops will cause rotors to warp due to rapid cooling.

 

Update: Dealer called, new rotors on but still shaking on hard brake. Service taking deeper dive, looking at "hub" and bearings.

Many thx to all for your input and interest... I will keep you posted.

 

Update #2 - Car remains at dealer, Day 6, very little progress. New rear rotors installed but car still shudders when breaking. Informed by dealer today that front rotor measurements also showing out and that PCNA won't authorize rear hubs until new front rotors are installed and all four tires are Road Force balanced. Rotors arriving Monday so no play time this weekend! Stay tuned for more updates!

 

Thanks for the update..

 

New hubs four ways around and rotors too. If they don't fix hit them with the lemon law and ask for another car with similar features and mileage.

 

They sure it was not pad deposits?
To wrap the rotors they would have to get extremely hot.

Is your pvt or stability control working properly and not engaging the brakes??

 

^^^+1
Another thing to look at. I have had pad deposits on an M3 that caused nearly identical symptoms as warped rotors.