Slip, Sliding, Away - DO NOT LEAVE YOUR TAYCAN ON AN INCLINE ON SNOW...... BAD DAY AT THE OFFICE PT2

[glasair2s]

AS noted in another thread or on this one, don't recall, there may be an issue where there is a very thin layer of ice build up on the pads, which would affect the clamp down force on the rotor as the parking brake... since we don't use the pad often to heat them up, ice could build up and the friction needed between the pads and the rotors are not enough to keep the car from rolling... it could be that the PSCB or the ceramics have even enough less friction when cold so it would be interesting to see the people whom this has affected them their brake type.

Hi, the parking brake system used on Taycan is a simple drum on each rear axle (see attached print screen from the maintenance manual), so non braking force is applied to the front. The Panamera uses more or less the same parking brake system, but the difference is that the AWD/gearbox is blocking all 4 wheels at the same time, holding the car much better on inclines. Knowing this I, do I now not exclude a possible sliding of the rear wheels in my case. I will do next Saturday some simulations (with wheel chocks a few cm behind) and see what happens. Hopefully Im able to duplicate the event.

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[Peter Kelly]

Hi, Peter, I didn't read all comments yet in this topic. But I'm wondering if you had any feedbacks from your Porsche dealer, since I experienced this very scary occurrence as well today.

I guess we all are facing an extreme serious issue and if not already all Taycan owner must be urgently / immediately warned to not park the car on any incline, winter or any other season!

In fact today around 12h00 (Swiss time) my car was parked on an incline (I didn't mesure the %) but probably 7%. Parking spot was covered with fresh snow (no ice) so normally with a good grip. So no discussion about any slipping. Next to my car was a WV transporter, not light as well.

My car is equipped with brand new winter tires recommended and installed by Porsche.

Suddenly after approximately 12-15 min after having engaged the "P", the car moved backwards. At that exact moment I was just behind, preparing myself for a ski tour. Lucky me, the car was stopped by my backpack who on the ground.

Outside temperature 1°c.

Best regards,
Werner

Hi Werner

Porsche UK have come back to me. They confirmed that the handbrake was working and no fault with the brakes. They have not confirmed anything else and have effectively closed this down. Surprising as it seems to me something has gone wrong. No other car has done this in 20 years in my parent's drive.

Regards

Peter

 

[Peter Kelly]

Already reported to my Geneva Porsche dealer. They are warned of that major safety issue, and the ball is now on their side to act. The only thing I can say is to be very careful and probably put wheel chocks in place if parked on a slope. That's what I will do now. Was really really scary believe me !!!

This cannot be right - wheel chokes on a car like that?

 

[wmras]

Ran a test on our 7-8% slope dry concrete driveway after reading these driving issues.

First, is the parking brake (P) an emergency brake? Placed the Taycan in Neutral and let it start rolling backwards - pressed P and it stopped almost immediately. Clearly worked as a brake. Temperature was 50F (10C). Was slightly surprised at how aggressively it stopped.

Since day one, have been concerned the Taycan did not have separate Park and Brake functions. Not concerned now, but my shutdown procedure is:

1. Turn steering wheel to do the least damage if the car rolls
2. Foot on brake
3. In gear (R or D)
4. Press P
5. Press off (1/0) until the red brake light in the cockpit display fades off
6. Check to see if P is still lit on dash

All become automatic after a few shutdowns (I am a pilot).

 

[faroutinNM]

Ran a test on our 7-8% slope dry concrete driveway after reading these driving issues.

First, is the parking brake (P) an emergency brake? Placed the Taycan in Neutral and let it start rolling backwards - pressed P and it stopped almost immediately. Clearly worked as a brake. Temperature was 50F (10C). Was slightly surprised at how aggressively it stopped.

Since day one, have been concerned the Taycan did not have separate Park and Brake functions. Not concerned now, but my shutdown procedure is:

1. Turn steering wheel to do the least damage if the car rolls
2. Foot on brake
3. In gear (R or D)
4. Press P
5. Press off (1/0) until the red brake light in the cockpit display fades off
6. Check to see if P is still lit on dash

All become automatic after a few shutdowns (I am a pilot).

Maybe also?

From the owner's manual Operating Principle section under HOLD Function:

If the driver seat belt is unfastened and the driver
door is opened while the HOLD function is active, the
parking lock and parking brake are activated
automatically.

 

[wmras]

Maybe also?

From the owner's manual Operating Principle section under HOLD Function:

If the driver seat belt is unfastened and the driver
door is opened while the HOLD function is active, the
parking lock and parking brake are activated
automatically.

Yes. The key is “the HOLD function is active”.

 

[Oink]

... which in my experience just activates at random. I can never get it activated when I try to go for it, but when I don't... Lol. It's like looking for lego pieces.

 

[wmras]

... which in my experience just activates at random. I can never get it activated when I try to go for it, but when I don't... Lol. It's like looking for lego pieces.

And now you know why I use the shutdown procedure described previously.

 

[glasair2s]

Hi Werner

Porsche UK have come back to me. They confirmed that the handbrake was working and no fault with the brakes. They have not confirmed anything else and have effectively closed this down. Surprising as it seems to me something has gone wrong. No other car has done this in 20 years in my parent's drive.

Regards

Peter

Hi Peter, can you send me some high resolution pictures, the one from the drive way?

On my side my dealer made a report to Porsche beginning of this week. We downloaded also the fault history, but no fault noted. Let’s see the outcome.

Cheers, Werner

 

[glasair2s]

Ran a test on our 7-8% slope dry concrete driveway after reading these driving issues.

First, is the parking brake (P) an emergency brake? Placed the Taycan in Neutral and let it start rolling backwards - pressed P and it stopped almost immediately. Clearly worked as a brake. Temperature was 50F (10C). Was slightly surprised at how aggressively it stopped.

Since day one, have been concerned the Taycan did not have separate Park and Brake functions. Not concerned now, but my shutdown procedure is:

1. Turn steering wheel to do the least damage if the car rolls
2. Foot on brake
3. In gear (R or D)
4. Press P
5. Press off (1/0) until the red brake light in the cockpit display fades off
6. Check to see if P is still lit on dash

All become automatic after a few shutdowns (I am a pilot).

Hi, the park brake on the Taycan is separate. In fact, there are drums with an electro mechanical actuator for each side. See enclosed picture.

On my side, we sent a report to Porsche and made a download of There fault history showing no recorded fault.

I’m no longer convinced about any fault on the car itself. Knowing that the parking brake is as almost every car only on the back (and the front are just free, with no mechanical resistance).

Here my thinking:
When I parked on the snow covered surface, the snow was fresh and my car had a good grip. But after 12-15min, the remaining heat from the tires melted the snow, and below was probably ice. Result, my car slided backwards, as the only grip comes from aft park brake for a that heavy vehicle.

So from now on, I will avoid parking on inclines in winter with snow on the concrete, turn the steering to the side or install chocks for security!

Krgds, Werner

 

[Peter Kelly]

Just a quick note to say I am delighted that my car is back - what a drive and it was missed. As you can see from the photo, perfect job by Mitchell Inglis, Glasgow so well done. Thanks also to Iain Easdale at OPC Glasgow for confirming that Mitchell Inglis were the only repairer I should use.

Thanks both

Peter

 

[Jancha]

I have been running the Pirelli Elect P Zero Winter for three months. Great in the snow and cold on the Taycan. Usually run a Michelin winter tire on other cars not offered for Taycan.

same here. On pure ice, clearly, could be better. Snow/dry/moist - no issues.

 

[Peter Kelly]

 

[REIL]

@Peter looks great and well repaired. Hope you are enjoying driving it again.

 

[Peter Kelly]

@Peter looks great and well repaired. Hope you are enjoying driving it again.

Thanks Rick - it's fantastic and light years ahead of other cars. You forget how good the Taycan is!

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