PSCB: Slight scraping sound from front left wheel when in motion

[whitex]

I recall a Car and Driver comparison that showed no real difference between the stopping distance of PSCB and standard brakes. Since they do also not necessarily last longer I then concluded that they’re a cosmetic option, similar to PTS.

C&D and you forgot the endurance test. Bigger brakes will last longer before they fade and require a cooldown to continue on.

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[prj]

C&D and you forgot the endurance test. Bigger brakes will last longer before they fade and require a cooldown to continue on.

In case of a GTS the PSCB are not really bigger. There's like a 20mm difference, which is not going to change much (410mm vs 390mm), which means the surface area is just 10% larger, not sure that is going to be a quantifiable difference, especially since we don't know how well the coating transmits/radiates heat compared to cast iron.

In case of 4S and below where the rotors are 360mm the difference is larger.

 

[DerekS]

My experience with premature PSCB disc failure is here:
https://www.taycanforum.com/forum/threads/pscb-service-life-and-replacement-cost.5432/post-416366

My car stood at the dealer for 10 weeks while I wrangled with Porsche about whether delamination of 1 of the 8 coatings was a manufacturing defect rather than normal wear and tear (only the inside of one of the rear disc surfaces had delaminated). The Tungsten coating is only 0.1mm thick. That makes me doubt whether manufacturing is always reliable enough to achieve the claims of additional durability.
When I collected the car after that experience there was a new rubbing noise from the previously unaffected front discs. The dealer diagnosed this as a hot spot and recommended also replacing the front discs and pads.
Assuming this was somehow due to the car standing for a while I declined their advice and said I’d try a bedding in process. That cured the problem, saving me about £2.5k.

@DerekS - as your discs and pads are now new you could see if bedding them in helps cure the problem.
This TSB may also be relevant:

https://www.taycanforum.com/forum/t...from-the-front-axle-area-august-6-2024.21075/

I recall a Car and Driver comparison that showed no real difference between the stopping distance of PSCB and standard brakes. Since they do also not necessarily last longer I then concluded that they’re a cosmetic option, similar to PTS. I decided I’d never again have PSCB. I’ve since extended that to Porsche in general. After buying 4 cars in 8 years (and loving them all) I’ve had too many bad experiences.

As replacing pads is part of the 6 year service, interesting that you said above that pads and PSCB discs must be replaced together. Given PSCB durability claims that also sounds ‘off’.

My current status is that replacing the front pads/rotors did cure the “scraping” sound.
I now have what I’d call a “metallic wind hiss” that I hear > 60mph, and my assumption is this is wind in the new rotors.

I did go ahead and order a set of rear rotors/pads from Suncoast, as I’d like all of it to be new as it should be on a new car.

I’m with you on PSCBs, I think they are honestly kind of a dumb option and not worth the cost.
If these fail while I still own the car, I will probably buy red calipers and iron rotors rather than buy 11K in parts for the “shiny.”

In your case where only one side of one rotor failed, it seems like a very obvious manufacturing defect.

 

[DerekS]

I’ve been driving the new ones very gently, no hard stops yet.
Around 1K miles so far.

 

[prj]

If these fail while I still own the car, I will probably buy red calipers and iron rotors rather than buy 11K in parts for the “shiny.”

I think it might be possible to get iron rotors in the same size off of a Panamera.

 

[DerekS]

I think it might be possible to get iron rotors in the same size off of a Panamera.

My previous GTS had iron rotors and red calipers.
My wife commented the other day that the white calipers are ugly and I should get them painted.

I had to explain that rotor color is linked to brake type, and that it’s probably not a good idea to change it.

 

[SoccerMan94043]

My previous GTS had iron rotors and red calipers.
My wife commented the other day that the white calipers are ugly and I should get them painted.

I had to explain that rotor color is linked to brake type, and that it’s probably not a good idea to change it.

My car was optioned to paint the calipers black... I would have liked them to remain standard red.

 

[prj]

My previous GTS had iron rotors and red calipers.
My wife commented the other day that the white calipers are ugly and I should get them painted.

I had to explain that rotor color is linked to brake type, and that it’s probably not a good idea to change it.

You can paint them in any color you like and you can order it painted into any color when you are buying the car new.

 

[mystermykee]

Sorry to thread jack. Are the 10pot PSCB Akebonos the exact same as the PCCB Akebonos? With the exception of different brake pads--obviously.

 

[prj]

Sorry to thread jack. Are the 10pot PSCB Akebonos the exact same as the PCCB Akebonos? With the exception of different brake pads--obviously.

I doubt it as the PCCB are 10mm larger.

 

[ct14garage]

Sorry to thread jack. Are the 10pot PSCB Akebonos the exact same as the PCCB Akebonos? With the exception of different brake pads--obviously.

10 pot PSCB caliper and 10 pot PCCB caliper are exactly the same caliper. Akebono 10n caliper.

The rotors though are different as PCCB are 10mm larger but it doesn't really matter. Caliper can be paired with an almost infinite selection of different rotor sizes!

 

[CrazyINP]

10 pot PSCB caliper and 10 pot PCCB caliper are exactly the same caliper. Akebono 10n caliper.

The rotors though are different as PCCB are 10mm larger but it doesn't really matter. Caliper can be paired with an almost infinite selection of different rotor sizes!

Are you sure”? Physically they don‘t look the same. I have looked at pictures above and my PCCB calipers are much bigger than what @DerekS posted

 

[ct14garage]

Are you sure”? Physically they don‘t look the same. I have looked at pictures above and my PCCB calipers are much bigger than what @DerekS posted

Of course it's different, because what @DerekS posted is not 10 pot at all.

Here is a pic of 10 pot PSCB caliper

 

[CrazyINP]

Of course it's different, because what @DerekS posted is not 10 pot at all.

Here is a pic of 10 pot PSCB caliper

I see the confusion thanks for clearing this up. Yeah those do look the same just different color. This is probably turbo or turbo s as those came with bigger brakes.

 

[ct14garage]

I see the confusion thanks for clearing this up. Yeah those do look the same just different color. This is probably turbo or turbo s as those came with bigger brakes.

And this one from Mercedes-Benz AMG is still the exact same caliper, but AMG uses completely different size disks both in diameter and in width. Many different brands use the Akebono 10n caliper

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