High Voltage Battery Recall EXPANDED - ARB6 & ARB7

[Travis]

My car was dropped at service yesterday and I was told the battery monitoring software was not available. I am having the break line recall done and was told that required a full brake line flush that would typically be done during my two yr service and I will not need to do it at that time which is a few months away.

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[W1NGE]

My car was dropped at service yesterday and I was told the battery monitoring software was not available. I am having the break line recall done and was told that required a full brake line flush that would typically be done during my two yr service and I will not need to do it at that time which is a few months away.

Keep an eye on the brake fluid replacement as some folk on the forum were told by their Porsche Centres that the replacement would be required even though it had already been done within a short space of time.

I've my 2 year service coming and had the brake hose work done before Christmas and when I booked the service a week ago it was confirmed that I did not need (therefore require to pay for) the fluid replacement as it was already done.

Software I think isn't due until end Q1 25.

 

[Travis]

They told me since they will be flushing the entire system I also will not need to pay for it a few months from now is what they said. I recall others here saying they were told the brake line recall did not include a full flush and more of a “top off” but my service guy said they will do a complete flush.

 

[JIP1080]

My car was dropped at service yesterday and I was told the battery monitoring software was not available. I am having the break line recall done and was told that required a full brake line flush that would typically be done during my two yr service and I will not need to do it at that time which is a few months away.

I have mine scheduled for the same on March 12th, and similarly am due for the two year flush. Will see if they throw in the flush or not. Will also be another data point on the diagnostic software availability for ARB7.

 

[gtm]

They told me since they will be flushing the entire system I also will not need to pay for it a few months from now is what they said. I recall others here saying they were told the brake line recall did not include a full flush and more of a “top off” but my service guy said they will do a complete flush.

The brake hose replacement (ARB0) does not specify a brake system flush. WPK0, the workshop campaign to reprogram the PSM control unit, does specify a "ventilation" (Porsche's term) of the brake system. I believe that WPK0 is almost always done with ARB0 so most cars have the proper ventilation done with the hose replacement. Replacing front brake hoses would not necessarily require a full system flush much less the fairly involved ventilation routine specified in WPK0. Make sure WPK0 is performed and there should be no need to repeat a brake system flush at the 20,000 mile/2 year service.

 

[f1eng]

My dealer insisted the brake pipe replacement did not require a flush and they did do the flush and fluid replacement and bill for it at the service a few weeks later.

 

[SergeyIndy]

My dealer insisted the brake pipe replacement did not require a flush and they did do the flush and fluid replacement and bill for it at the service a few weeks later.

This seems to be the UK thing only, meaning that UK dealers either charge for full or slightly discounted full brake fluid flush at the 2y/20k mile interval after ARB0 has been performed.

I had ARB0 and WPK0 performed and I observed the entire process that involved full brake fluid flush, but as @gtm is stating only WPK0 specifically calls for full flush. The process is very involved with a bar mechanism keeping brake pedal fully pressed down, while they go around and drain the fluid from each corner, using a rolling canister capture, requiring 2 people in my case.

Therefore, I wonder if anyone in the US can confirm if they were only for ARB0, do they have evidence of partial or full brake fluid flush. ARB0 is listed as mandatory safety recall, while WPK0 is VIN specific and listed as voluntary or something to that effect and not mandatory.

 

[gtm]

My dealer insisted the brake pipe replacement did not require a flush and they did do the flush and fluid replacement and bill for it at the service a few weeks later.

And at least from what has been issued in the U.S. he is correct. Replace the brake hose and bleed any air at the front calipers. Done. The brake hoses were replace due to excessive tension causing a mechanical failure. Nothing to do with the fluid. It's WPK0 that triggers the "ventilation" of the brake system. Might not be a UK/EU service bulletin. The ventilation procedure requires using the PIWIS to activate certain functions and ventilate the various subsystems of the ABS/Traction control/brake system.

 

[SergeyIndy]

And at least from what has been issued in the U.S. he is correct. Replace the brake hose and bleed any air at the calipers. Done. The brake hoses were replace due to excessive tension causing a mechanical failure. Nothing to do with the fluid. It's WPK0 that triggers the "ventilation" of the brake system. Might not be a UK/EU service bulletin. The ventilation procedure requires using the PIWIS to activate certain functions and ventilate the various subsystems of the ABS/Traction control/brake system.

WPK0 is the real deal that recalibrates the braking system and makes is noticeably better.
ARB0 is done to eliminate any risk related to bursting brake lines. I inspected mine as they removed them at about 10k miles and they all looked like new with no appearance of wear.

 

[Travis]

You guys are correct. The flush was related to WPK0 workshop that is getting done at the same time. I did not know the recall could be done exclusive of the workshop. I have both being done presumably because of VIN and falling in batch that required both. I assumed all Taycans required both.

 

[whitex]

I had ARB0 and WPK0 performed and I observed the entire process that involved full brake fluid flush, but as @gtm is stating only WPK0 specifically calls for full flush. The process is very involved with a bar mechanism keeping brake pedal fully pressed down, while they go around and drain the fluid from each corner, using a rolling canister capture, requiring 2 people in my case.

I did not watch mine, but here is what the billing looks like, separating parts and labor. Both ARB0 and WPK0 seems to have 5 of PKDOT and 5 DOT, which I assume is brake fluid. Not sure what "this is now half a liter" means. Also, anyone know how long is 1 TU (time unit)?

 

[mystermykee]

Also, anyone know how long is 1 TU (time unit)?

I believe 1/100 of an hour.

 

[whitex]

I believe 1/100 of an hour.

So 36 seconds? Extremely unlikely, as both ARB0 and WPK0 total billed time is 3.78TU, so that would mean they can do them both in under 2.3 minutes! Now that would be some world record efficiency!

 

[mystermykee]

So 36 seconds? Extremely unlikely, as both ARB0 and WPK0 total billed time is 3.78TU, so that would mean they can do them both in under 2.3 minutes! Now that would be some world record efficiency!

It's possible, and would make much more sense, if it is listed in hundreds.

 

[Tooney]

I believe 1/100 of an hour.

100 TU = 1 hour, from what I have read in lots of places.
Per TSB, replacing both brake hoses on front axle will allow slightly less than 2 hours labor to be charged for the work.
Maybe the tech who wrote @whitex report has a problem with decimals (or TU is more than 1/100 th hour..... ) or that tech is damn fast.

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