Brake wear vs. frequency of charging

[Tucks TS]

On the topic of brakes, has anyone had the privilege of replacing their carbon ceramic brakes yet? I was curious and asked my local Porsche dealership what it would cost and was quoted AU$50k ?!! Surely not ?‍

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[Archimedes]

On the topic of brakes, has anyone had the privilege of replacing their carbon ceramic brakes yet? I was curious and asked my local Porsche dealership what it would cost and was quoted AU$50k ?!! Surely not ?‍

PCCB rotors will outlast most cars that actually use their brakes. On a Taycan, they’ll still have lots of life left when your car is long gone and rusting somewhere in a junkyard.

 

[whitex]

On the topic of brakes, has anyone had the privilege of replacing their carbon ceramic brakes yet? I was curious and asked my local Porsche dealership what it would cost and was quoted AU$50k ?!! Surely not ?‍

That price is about right, I was told $35K USD for all 4. This was one of the reasons I didn't want a Turbo S. Barring heavy track usage you're unlikely to need replacement for many years (or ever), however any damage is expensive to repair. I've also read PCCB's are more susceptible to damage than regular brakes too.

 

[WasserGKuehlt]

As a side note, the brake cleaning doesn't bother me, but I do notice it, and it got me thinking, hence this thread.

What serendipity: (about 4:08 in).

 

[Tucks TS]

PCCB rotors will outlast most cars that actually use their brakes. On a Taycan, they’ll still have lots of life left when your car is long gone and rusting somewhere in a junkyard.

PCCB rotors will outlast most cars that actually use their brakes. On a Taycan, they’ll still have lots of life left when your car is long gone and rusting somewhere in a junkyard.

I hope so thanks for replying

 

[Tucks TS]

That price is about right, I was told $35K USD for all 4. This was one of the reasons I didn't want a Turbo S. Barring heavy track usage you're unlikely to need replacement for many years (or ever), however any damage is expensive to repair. I've also read PCCB's are more susceptible to damage than regular brakes too.

Thanks for letting me know! I have done a few track days but was unaware they are more susceptible to damage!! Hopefully they will drop over time or when and if I need to replace them

 

[rs38]

@whitex do you lock your car over night with or without charging?

in general: watch if the car uses the friction brake is trivial if the powermeter is active.

 

[whitex]

@whitex do you lock your car over night with or without charging?

Yes, I lock my car whether even in the garage at home (it will auto lock anyways, though mirrors won't fold on auto-lock).

in general: watch if the car uses the friction brake is trivial if the powermeter is active.

I have my nigh vision on the IC all the time because I don't want to have to remember to switch it on when driving at night. I can tell whenever the regen is disabled on my car pretty well without the power meter. When driving in silence, I can hear it too. This is why I realized recently that I haven't been charging every time I'm home, that it doesn't kick in as often.

 

[whitex]

What serendipity: (about 4:08 in).

I think the algorithm that decides that also considers self-calibration which from what I read happens when the car is plugged in to charge - calipers move very slowly from limit to limit to recalibrate the braking system, compensate for pad wear.

 

[W1NGE]

I am not trying to get people to start obsessing over their brake wear or charging frequency, however I have noticed an interesting trend. We all know the first mile or two every day the Taycan will use mechanical brakes to clean off the rust. We also know that Taycans recalibrate their brakes while charging (the brake calipers move very slowly to determine the brake pad thickness). I recently have been using the garage for some projects, so not charging the Taycan every single night if it doesn't have to be (80A charging comes handy when charging in the driveway, completes much faster than 40A or 48A). I realized after a little while that if I charge the Taycan every day, every day it seems to use mechanical brakes for the first mile or two. If I don't charge it overnight however, recuperation is always on and the mechanical brake rust-off doesn't happen as often, or at all actually. It made me wonder, does charging every time the Taycan is in the garage cause greater brake pad usage? It's not like the Taycan actually uses shore power to top off the 12V or to precondition the car, like other EV's, so I'm starting to wonder about the benefits of plugging it in like I did all my Teslas (which did use shore power to pre-condition or top off 12V, therefore avoiding cycling the main battery - Porsche evidently has not discovered that rather obvious benefit yet).

I don't charge every day and every day no recup until the first mile. Therefore the brakes are used. Same with my 4S and now GTS. I have PSCBs on my GTS (no rust) so not convinced this is a rust clearance measure either and a by product only.

Totally unaware of the recalibration you describe and not noticed it. Had assumed this happens when the car is in use and when the pedal is depressed (this learning procedure occurs from new or after a service).

Brake pad wear will be more than you might expect in normal use. The report I got after my 4S had it's 2 year service made interesting reading.

 

[whitex]

I don't charge every day and every day no recup until the first mile. Therefore the brakes are used. Same with my 4S and now GTS. I have PSCBs on my GTS (no rust) so not convinced this is a rust clearance measure either and a by product only.

Totally unaware of the recalibration you describe and not noticed it. Had assumed this happens when the car is in use and when the pedal is depressed (this learning procedure occurs from new or after a service).

Brake pad wear will be more than you might expect in normal use. The report I got after my 4S had it's 2 year service made interesting reading.

I have PSCB's on my Taycan, so there should also be no rust, but regen is disabled at beginning of some drives.

This is the brake calibration while charging which I was talking about (from Porsche Information Technik TT/TTS MY 2020):

I also remember seeing this mentioned in one of the YouTube reviews by Out Of Spec. I realize the above says "during high voltage charging", which might imply DC charging, but then cars which never DC charge would never calibrate, so I suspect in means during charging of the high voltage battery.

 

[mikezhang31]

For daily use on Carbon Ceramic brakes, you just have to be careful of 2 things:

when you take the wheels on and off, you should use guiding pins so you don’t accidentally clip the rotors with the wheel barrel and chip the rotor

not use traditional cleaning solutions on the rotor that you use for brake dust as it may damage the chemical coating on the rotors that’s used to to generate friction

otherwise they will last forever. The carbon ceramics on my Ferrari are 16 years old with like 40k miles on them are they are working just fine.

 

[tbinmd]

The calipers will not move limit to limit, there’s no way for that to happen. The system may pressurize the brakes and move the pedal. Just like when ACC is active. Brake pads in this car will last well over 100k miles, even if all you do is short trips.

 

[rs38]

Yes, I lock my car whether even in the garage at home (it will auto lock anyways, though mirrors won't fold on auto-lock).

I am also unaware of Taycans having a true auto-lock feature. There is only a lock if you unlock and do not enter the car.

 

[WasserGKuehlt]

I think the algorithm that decides that also considers self-calibration which from what I read happens when the car is plugged in to charge - calipers move very slowly from limit to limit to recalibrate the braking system, compensate for pad wear.

The recalibration algorithm, as I recall, shares the same time requirement, in addition to the level of charge (from sufficiently low of a SoC). So I don’t know if they’re related.

I also don’t charge daily, and the hydraulic brakes are unmistakably used at the beginning of each daily drive. The other component is temperature difference - in the evening, when I leave work, hydraulics are used first unless it was a hot day (and the discs aren’t cooling off that much). They’re basically modeling condensation + oxidation. (Mine are the basic steel discs.)

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