Guys,

Whilst not ideal, do you think if you watched the condition of this rotor as it wore it would still be ok given the cost to replace?

for my understanding this brakedisc is to replace for a new

you must replace it, or you can have a bigger problem....

Cars that have the PCCB brakes have 2 alignment dowels that screw into the hub that guide the wheel safely home without contacting the rotors. Sorry if you know this. If you don't they should always be used to R&R a wheel, always. Hope this may help avoid another costly disaster. From your pic it looks like a replacement is in order. I've seen ones with much smaller looking chips that have been considered junk. I'm no expert though.

Porsche say,

"The following criteria applies to edge damage assessment:
· Max. permissible width/depth = 2 mm!
· Max. permissible length = 10 mm!
· Max. 3 damaged edge areas permissible!"

If there is no fracturing or delamination I would run it but monitor the chip, rotor health and pads.

Find out if you can flip it over; or stick on the side you don't see when you get get up. Or just after you turn out the lights..

You'd probably want just the opposite, not good to have damage that could increase where you can't see it. Just when you stop, inspect it first and then roll the car forward where the caliper is blocking view of it.

Run it

Thats a pretty big chunk missing... ever seen a PCCB disc fail? Corvette at sebring comes to mind when disc exploded.. which leads to pistons coming out ,no pedal and free trip to tire barrier.

Don't track them!

Hmmm brakes are one place I'd rather not have to worry about.

i will definitely used them.... c'mon

there is no way that can be safe.
picture that rotor spinning really slowly in your head...
now.. imagine the edge of a brake pad as the piston pushes it against that chip...


the chip will be like a pot hole for the edge of the brake pad and will get lodged in there...
need i say more ?


note:
i JUST finished smoking a joint..
and this has to be one of my better technical explanations i must admit.

Guys, this is the spec from the Porsche service manual