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

[DerekS]

Time to go for a long drive to enjoy your new car!

Finally!!!!!

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[tigerbalm]

I just got the word. It’s ready this afternoon at last.
Got a nice video showing my now shiny rotors.

Great stuff. Don't bring it to a track!

 

[SoccerMan94043]

Great stuff. Don't bring it to a track!

Or, better, do but treat the brakes appropriately

 

[DerekS]

Brake noise is definitely gone.

Now that it is, I’m hyper-tuned to other road noises.

This car definitely has a different noise profile than my 2023 did. I’ll never know if it’s the Conti tires, normal wind noise, or bearing damage from the track abuse.

Plan at this point is try and ignore it as I just can’t stand any more service time, especially chasing a super nitpick that may be normal.

All I can say is I will never buy a CPO again, as my trust in that program is now permanently shaken.

 

[whitex]

Or, better, do but treat the brakes appropriately

Do you mean use the "never touch the brake pedal while on the track" racing technique?

 

[refazi]

Brake noise is definitely gone.

Now that it is, I’m hyper-tuned to other road noises.

This car definitely has a different noise profile than my 2023 did. I’ll never know if it’s the Conti tires, normal wind noise, or bearing damage from the track abuse.

Plan at this point is try and ignore it as I just can’t stand any more service time, especially chasing a super nitpick that may be normal.

All I can say is I will never buy a CPO again, as my trust in that program is now permanently shaken.

You are welcome to compare noises with my RWD and Turbo S J1.2 CPOs

 

[DerekS]

You are welcome to compare noises with my RWD and Turbo S J1.2 CPOs

I may take you up on that. The “new” noise is really only audible over 40mph, and increases in volume with speed.

It’s more of a wind-type noise than the prior scrape.
Maybe wind blowing through new PSCB rotors?

I don’t think it’s a bearing issue as it doesn’t have a vibration component to it.

I don’t recall this on my 2021 base w/ PSCBs, but I’m just trying to deal with it now.
I literally can’t stand any more service time for a while. A long while.

The car is appropriately silent around town so at least the core issue was fixed.

 

[SoccerMan94043]

I may take you up on that. The “new” noise is really only audible over 40mph, and increases in volume with speed.

It’s more of a wind-type noise than the prior scrape.
Maybe wind blowing through new PSCB rotors?

I don’t think it’s a bearing issue as it doesn’t have a vibration component to it.

I don’t recall this on my 2021 base w/ PSCBs, but I’m just trying to deal with it now.
I literally can’t stand any more service time for a while. A long while.

The car is appropriately silent around town so at least the core issue was fixed.

Happy to have you listen to my GTS as well if you'd like. You might only hear the rattles though

 

[whitex]

The “new” noise is really only audible over 40mph, and increases in volume with speed.

Does it correlate with 1st vs. 2nd gear?

 

[d00d]

I agree with that, and find it strange that PSCBs are a required option when you get the Mission E wheels.

I had no issues with the steel brakes on the 23, and while my wheels were black so they didn’t show much dust regardless, I really didn’t feel like I was wearing them as I did on a 911.

Steel brake disks aren't a thing, if they were they wouldn't work as well as the conventional iron ones that do exist.

The .1 Mission E wheels required at least the larger diameter PSCBs, but the .2 Mission E doesn't, presumably because the taller rim doesn't make the standard rotor look so alone in there.

You mentioned a few scary braking incidents with the .1 PSCBs?

 

[DerekS]

You mentioned a few scary braking incidents with the .1 PSCBs?

There were a few incidents with my 2021 base where the brakes didn’t seem to bite like they should, especially when wet.

It could have been the (now-known, recalled and addressed) brake line issue though.

 

[DerekS]

Happy to have you listen to my GTS as well if you'd like. You might only hear the rattles though

I have a couple of those too. I really did go from the frying pan to the fire by purchasing my way out of service hell

It makes me kinda miss my ‘23 GTS, which was perfect until it threw that Electrical System Error.

 

[pjg03d]

Under 100. All Porsches have around 10-12 from the factory and it had 105 when it landed in Ontario. 115 when I rolled it out.

They must have seriously punished the hell out of it to cook them like that in around 85-90 miles.

Having done the Porsche Precision school at Barber's in Birmingham a week ago - we used the Panamera GTS for precision braking, taking the car to ~40MPH and slamming the brakes repeatedly on a very small course. The instructors said they used Taycans for this specific course until they shipped them off to auction in the summer(?). They use the Taycan and Panamera for this specifically because of the car's weight, so the driver can feel the extreme shift during hard and trail braking.

So I guess it's possible your car put on ~100 miles of literally accelerating and 100% braking over and over and over again on like, a 300ft course.

 

[DerekS]

Having done the Porsche Precision school at Barber's in Birmingham a week ago - we used the Panamera GTS for precision braking, taking the car to ~40MPH and slamming the brakes repeatedly on a very small course. The instructors said they used Taycans for this specific course until they shipped them off to auction in the summer(?). They use the Taycan and Panamera for this specifically because of the car's weight, so the driver can feel the extreme shift during hard and trail braking.

So I guess it's possible your car put on ~100 miles of literally accelerating and 100% braking over and over and over again on like, a 300ft course.

I don’t know if 40mph would have done it! THese things saw extreme heat.

 

[D00notD00d]

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’.

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