Rusted PSCB brakes

[Vercingetorix]

Why isn’t the inside of the brake drum shiny? Or is the picture not showing it? Agree something looks like it corroded that rotor.

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[Jenner]

Rusty rotor hub on Porsche (or any other make of car) is totally normal.

Quick examples from google:

https://davidrweaver.com/painting_brake_hubs/

" It is very common for cars brake hubs to rust, not only in Porsches, but American cars as well. Common though it is, it is very ugly. The rust is not dangerous, just ugly. "

Exactly what David says except it can really apply to any/all cars.

 

[Jenner]

Why isn’t the inside of the brake drum shiny? Or is the picture not showing it? Agree something looks like it corroded that rotor.

Simply because he lives in the north and drives his car in all weather (ie not a garage queen) including rain, snow and possibly roads treated with salt.

Only cars from desert climates with low humidity and/or low mile cars kept in storage for most of their lives could have rust free brakes.

 

[Vercingetorix]

There should be no rust on the inside of the drum. That’s where the parking brake shoe makes contact. I have never seen rust there in any car I’ve ever worked on. But none of those had electric parking brakes so…?

 

[Flying ace]

The rust inside the hub is not as concerning as the multiple holes where PSCB material is completely missing and the "bubbling" of the tungsten coating around the rest of the rotor face.

It looks to me like the coating was worn through or worn off and then water possibly other chemicals got access to the material under the coating via the holes and then was additional subjected to extreme temps (ie hard braking).

Completely guessing here but either the tungsten coating was defective from the factory or this rotor was subject to some chemicals it didn't like.
I am thinking something along the lines of being parked at the beach with high exposure to salt water or possibly even being submersed in salt water/flooding for a time or less likely but plausible some aggressive car/wheel wash chemicals that did not agree with this rotor.

Since it was not noticed until the car was out of warranty the question of it being defective is out the window at this point.

The good news is it is off your car and no longer a safety issue for you but I would keep an eye on this rotor and make sure to check the back side of it that you can't see without getting under the car to inspect for this to happen again. Document everything about this rotor (and save this one) in case it happens to the 2nd one.

+1 . Based on the picture and the prior reference of the tungsten carbide coating patch that was missing, it appears the coating is coming off. It is a safety issue. The rust inside the hub is a non-issue as it is not a surface used for friction. I think there was some type of misinterpretation of the word rust, but it appears that this is correctly assessed as excess wear on the rotor

 

[W1NGE]

I actually don't like the PSCB discs for that reason. They are expensive when compared to iron discs and they only last about 1.5 times as long. Obviously the carbon ceramic discs are a lot more expensive, but won't rust or realistically need replacing with normal use.

The PSCB discs sit awkwardly somewhere in the middle.

I've no clue why your discs rusted – do you keep the car outside in the rain? But I imagine the rear brakes in an EV get very little use.

The price quoted "feels" about right to me and would be what I'd expect.

I had the PSCB discs on my 4S. If I was buying a new Turbo today which comes with PSCB as standard, I'd upgrade it to the PCCBs.

Hmm I doubt it.

PSCB don't rust and from the picture don't look rusted. Suspect they are referring to other components.

PCCB are a hefty cost $$$$$ to repair / replace compared to PSCB.

My PSCBs are fine and zero dust.

 

[D00notD00d]

From the German Taycan forum
https://www.pff.de/en/thread/2812336-pscb-wear-pattern/?pageNo=3

…. I found a link to the following


….. in you tube settings you may need to turn on sub titles and auto translate

The conclusion suggested is that the coating issue is caused by a pad material defect and there has been a number of different pad versions, which may have been to correct an issue.

The pictures attached here show the discs just replaced on my MY21, where one of the the disc surface coatings has delaminated.

 

[chun]

From the German Taycan forum
https://www.pff.de/en/thread/2812336-pscb-wear-pattern/?pageNo=3

…. I found a link to the following


….. in you tube settings you may need to turn on sub titles and auto translate

The conclusion suggested is that the coating issue is caused by a pad material defect and from there has been a number of different pad versions, which may have been to correct an issue.

The pictures attached here show the discs just replaced on my MY21, with where one of the the disc surface coating has delaminated.

So it should be a recall, but again, nobody checks on poor old german companies - everyone in goverments is too busy being concerned that chinese companies will take over - german automakers deserve what's coming to them, with all the penny pinching savings they do, on the back of their clients, while charging premiums of 3-4x on their BOM of cars.

I would sooner go to court than pay for replacment for a disc damaged like yours.

The disc doesn't showcase normal use - which is not covered by warranty. If it were normal use, both inside and outside would be delaminated. If it were normal use, all discs would have marks of delamination, not just that one.

This kind of delamination present on your disc, on only the inside of 1 disc, with less km of use than the disc is rated for, on a car with insane amounts of regenerative braking, in not even 4 years - should be covered by warranty, as it's clearly a manufacturing defect of the disc, as it's very clearly not normal use & tear.

My car came standard with PCSB, and if they try this bullshit with me, when just 1 disc is delaminated like that, I will go to court against them. I'd rather be that petty.

 

[ZenicaNC]

My dealer service dept told me the 2020 Taycan with the PCSB uses a larger rotor and calipers with more pistons than the model years that followed. Is this true?I wonder, are the pads different from 2020 vs 2021+?

 

[chun]

My dealer service dept told me the 2020 Taycan with the PCSB uses a larger rotor and calipers with more pistons than the model years that followed. Is this true?I wonder, are the pads different from 2020 vs 2021+?

Calipers on 2020 turbo and turbo s have 10 pistons, yes. Following years of turbo and turbo s went down to 6 I believe (all non-iron brakes); rest of the models with iron brakes have 4 pistons as far as I can remember.

As for rotor size, it could be possible, never read anything about it or compared. Mine are 16.4 inches

Calipers differences, in terms of quality or capability, again, no public info.

But yes, your dealer is right, that only my20 came with 10 piston brakes.

Like all OEM parts, part code is changed based on manufacturing year - doesn’t necessarily mean any changes have been made to the actual part.

 

[D00notD00d]

https://www.taycanforum.com/forum/t...oss-turismos-car-and-driver.27948/post-419649

 

[BjörnfromHamburg]

Turbo S PCCB standard with 10 piston still.
The others went to 6 pistons.

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