[MLJJ]

Mine is a base with PDK and 800 miles on the clock. This morning I went through the typical cold start up process. When I put the car in R I typically just idle out of the garage. This morning it wouldn't move while in R. Thinking I missed the gear, I put it back in P and then back to R. Still no movement. Gave it a little (I mean little) gas and felt a sharp and jarring jolt while starting to move back. It didn't repeat when warm. Obviously, I'll keep an eye on this, but wondering if anyone has experienced this or might have an explanation.

 

[UKG]

Just the once when I’d forgotten i had put the handbrake on, felt a right wally ?

 

[wriggly]

Mine is a base with PDK and 800 miles on the clock. This morning I went through the typical cold start up process. When I put the car in R I typically just idle out of the garage. This morning it wouldn't move while in R. Thinking I missed the gear, I put it back in P and then back to R. Still no movement. Gave it a little (I mean little) gas and felt a sharp and jarring jolt while starting to move back. It didn't repeat when warm. Obviously, I'll keep an eye on this, but wondering if anyone has experienced this or might have an explanation.

Did you drive in the wet before putting away? Or maybe wash the car before hand? Wet or damp brake pads can and will stick to the rotors during the drying process resulting in what you describe. Quite common with cars.

 

[MLJJ]

Yes, as a matter of fact, I did wash it the night before she went to bed. Genius! Hope that's all it is. Thanks.

 

[Porsche2018]

@wriggly very clever. After I wash my Porsche I back it in and out of my garage 3 or 4 times. FYI, I have tried to drive around the block once to clear water from the brakes and I will never do that again......the wheel barrels picked up numerous rocks that became adherent to the damp rim...........up and down the driveway is the ticket.

 

[GregW]

Yes, as a matter of fact, I did wash it the night before she went to bed. Genius! Hope that's all it is. Thanks.

Yup, I'll bet that's it. I've had it happen a couple of times with the Boxster and with the Moto Guzzi California. Both have iron rotors, not stainless.

 

[717R]

Yup I have the same issue the next day, post wash.

Btw the rust build up on the brake discs - how does one prevent it and does it cause any harm actually?

 

[4802]

Yes, as a matter of fact, I did wash it the night before she went to bed. Genius! Hope that's all it is. Thanks.

After washing & drying the vehicle, quickly take it for a little drive up the road to dry off the brakes. It doesn't need to be far & you only need to apply the brakes lightly a couple of times to clear water & preferably generate a little heat. I'm not saying go on a grand tour, just to the end of the road & back is sufficient. If you don't then they can actually seize on pretty firmly if the car is left for a few days. Next time you wash your car, just take a look at the discs after you've finished drying it etc. I wouldn't mind betting that you'll see that a thin film of rust has already formed.

 

[GregW]

Yup I have the same issue the next day, post wash.

Btw the rust build up on the brake discs - how does one prevent it and does it cause any harm actually?

For a day or so I haven't noticed any harm.
Just oil the rotors--that should stop the rust--of course that will also stop the car from stopping.

 

[alf_17]

Just oil the rotors--that should stop the rust--of course that will also stop the car from stopping.

Yeah, oiling the brake rotors does not seem like good advice

 

[CupraLeon]

Yup I have the same issue the next day, post wash.

Btw the rust build up on the brake discs - how does one prevent it and does it cause any harm actually?

To prevent it you can use this:https://www.autogeek.net/hydes-serum-rust-stopper.html

 

[Nosmo]

There is nothing I'd put on the brake rotors, however tempting a squirt of WD40 may be. There is no substitute to braking the rusty rotors from a reasonably decent speed. I'll clean up the debris from the wheel barrels with used microfibres on their last outing before they get trashed.

 

[718S]

Mine is a base with PDK and 800 miles on the clock. This morning I went through the typical cold start up process. When I put the car in R I typically just idle out of the garage. This morning it wouldn't move while in R. Thinking I missed the gear, I put it back in P and then back to R. Still no movement. Gave it a little (I mean little) gas and felt a sharp and jarring jolt while starting to move back. It didn't repeat when warm. Obviously, I'll keep an eye on this, but wondering if anyone has experienced this or might have an explanation.

Same thing happened to me today! So glad I’d read this thread. Talk about a loud snap.