PCCB equipped approved used purchase

[Singh911]

Hi all
I'm buying an approved used car from an opc.
They have measured the pccbs for me and come back with the following. I have no experience with ceramics but it seems from their info that they need to be replaced immediately.
Am I reading this right or us there more to it - grateful for any suggestions

Their email:

All measurements taken at 3 different points on each disc as per Porsche guidelines

Porsche spec Front Min Thickness- 33.62mm
Measured-
o/s/f- 34.08mm, 34.22mm, 33.98mm
n/s/f- 33.81mm, 33.92mm, 33.93mm
 
Porsche spec Rear disc Min Thickness- 27.83mm
Measured-
o/s/r- 27.95mm, 28.01mm, 28.00mm
n/s/r- 27.94mm, 27.95mm, 28.06mm
 

Thanks

[Porsche911R]

they are not done this way any more.

[Singh911]

I thought i'd read about measuring density etc - i asked the opc to do that and their head tech came back with the measurements above!

[tedblog]

You dont say what mileage the car has done? I would ask what the thickness of the discs are from is new and the thickness of the pads at present, new pads are 12mm. They can be good for 100k so they actually dont wear very quickly.

[Singh911]

its on 22k miles, pads are 9mm and 7mm.

they say porsche doesnt quote what the thickness of the discs is when new so they cant tell me. They have said that the minimum thickness they quoted is stamped on the disc chamber.

cheers

[Porsche911R]

https://youtu.be/asnGXOmQsYU

[Singh911]

thanks for the link very useful info

[Cheib]

I’m just imagining being a salesman selling a car to R

Never heard of that, very useful!

[Twinfan]

Funny how they keep showing a Cup car, which all run on steels - even the Supercup cars do now!

Interesting stuff though, but it just confirms my own thoughts that PCCBs are just way to much hassle to own.

[Porsche911R]

Cheib said:

I’m just imagining being a salesman selling a car to R

Never heard of that, very useful!

I am pretty simple to deal with, Redline said I was refreshing, straight forward and did what I said I would.
I know the value of cars, I know what people want to make, i'll push those margins a tad but there is always a deal.

[Far Cough]

"Ambitious driving" .... LOL

[Porsche911R]

Twinfan said:

Funny how they keep showing a Cup car, which all run on steels - even the Supercup cars do now!

Interesting stuff though, but it just confirms my own thoughts that PCCBs are just way to much hassle to own.

why hassle to own ? most people buy on finance, so they don't own the car anyway :-)

you tick the PCCB box, you reap the many pro's you get with CCB and then you sell the car having never had to touch them.
If anything you might even save money long term as the disks will last 100k miles if not tracked.

[993rsr]

Singh911 said:

Hi all
I'm buying an approved used car from an opc.
They have measured the pccbs for me and come back with the following. I have no experience with ceramics but it seems from their info that they need to be replaced immediately.
Am I reading this right or us there more to it - grateful for any suggestions

Their email:

All measurements taken at 3 different points on each disc as per Porsche guidelines

Porsche spec Front Min Thickness- 33.62mm
Measured-
o/s/f- 34.08mm, 34.22mm, 33.98mm
n/s/f- 33.81mm, 33.92mm, 33.93mm
 
Porsche spec Rear disc Min Thickness- 27.83mm
Measured-
o/s/r- 27.95mm, 28.01mm, 28.00mm
n/s/r- 27.94mm, 27.95mm, 28.06mm
 

Thanks

What model are you looking at, I take it prior to 991?

[Singh911]

Its a 981 spyder

[Twinfan]

Porsche911R said:

why hassle to own ? most people buy on finance, so they don't own the car anyway :-)

you tick the PCCB box, you reap the many pro's you get with CCB and then you sell the car having never had to touch them.
If anything you might even save money long term as the disks will last 100k miles if not tracked.

We have very different thoughts on PCCBs so I'm not dragging the debate up again here

[993rsr]

Singh911 said:

Its a 981 spyder

In which case the method they are using is correct. The Carboteq method is not applicable to pre-991 variants.


For perforated brake discs, the minimum thickness -x- must always be measured on the inner or outer
friction surface track -arrows- .
·
Wear limit: The brake disc minimum thickness is stamped on the brake disc chamber (example: Min.
Th. 33.7 mm).
·
– Measure the brake thickness -x- with a suitable micrometre screw or a brake disc gauge around the
inner or outer friction surface tracks -arrows- .


Evaluating surface roughness (Sr) (max. 80 micrometre permitted)

[Singh911]

Thanks for that.

Do you know what the thickness is brand new? - i am trying to guage whether the 0.2mm etc left before the minimum thickness level is reached is acceptable/enough for a few years road mileage. I dont plan to track the car.

Thanks

[boxsey]

Singh911 said:

Hi all
I'm buying an approved used car from an opc.
They have measured the pccbs for me and come back with the following. I have no experience with ceramics but it seems from their info that they need to be replaced immediately.
Am I reading this right or us there more to it - grateful for any suggestions

Their email:

All measurements taken at 3 different points on each disc as per Porsche guidelines

Porsche spec Front Min Thickness- 33.62mm
Measured-
o/s/f- 34.08mm, 34.22mm, 33.98mm
n/s/f- 33.81mm, 33.92mm, 33.93mm
 
Porsche spec Rear disc Min Thickness- 27.83mm
Measured-
o/s/r- 27.95mm, 28.01mm, 28.00mm
n/s/r- 27.94mm, 27.95mm, 28.06mm
 

Thanks

So, have you had the conversation with them that discs are nearly worn out and asked if they are going to replace them before you take delivery? If they say they will, you buy it. If they won't you walk away. Surely it's that simple?

[Singh911]

I emailed them along those lines last night. Waiting to hear back.
Cheers

[Porsche911R]

993rsr said:

In which case the method they are using is correct. The Carboteq method is not applicable to pre-991 variants.

the 981 Spyder is a newer model than a 991 ?

you can tell if it has the Carboteq printouts on the disk.

on pccb if you rub your finger on the disk and it's very black they are worn out. if it's clean they are new, if just a slight bit of dust they are 1/2 worn ;-)
take a look at the small circle and see if that has degraded. that's the wear marker.

you cannot really do it by thickness imo as they don't wear away like that and I doubt they will weigh them for you.

Edited by Porsche911R on Friday 3rd January 10:06