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991 Turbo S: Awful hot small & warning messages

Z

Z80

New member
Hi,

Just returned home after 3 miles out.

Adaptive cruise packed up.
Yellow message says PASM not working.
Yellow message says 4wd not working & it's ok to drive carefully.
Some other yellow message, can't remember.
Brakes very sensitive, like they're already half on.

Got home. God awful smell from the back like it's going to explode.

Called Porsche assistance. They said it requires recovering. Truck's supposed to be arriving tomorrow am for delivery back to Porsche Bristol.

1 year old 2.5 K on the clock.

Any clues as to what has happened?

Thanks,

Simon
 
ORIGINAL: Z80 1 year old 2.5 K on the clock. Any clues as to wtf has happened? Thanks, Simon
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Lack of use.....[8|] As Clive says sounds like something stuck on at the rear end which would probably throw 4WD, PTV, PSM, PASM and all the other acronyms into a tiz. Let us know what the PC have to say after they get the diagnostic on it.
 
Thanks Clive, tscaptain, Yeah I reckon so, particularly because the brakes seemed very sensitive. Is that viewable with a torch? What else might've been damaged by that? I just hope that Porsche Bristol find something & that the affected parts are all replaced. Regards, Simon
 
Hi i would say it is the bushings on the brake pedal assembly, this happened to me about 6 months ago on my 991s cabrio. What happens is that the bushings swell thus not allowing the release of the brake pedal resulting in the brakes been applied lightly . The further so drive the harder the brake pedal gets and really the car will stop eventually as the brakes are on thus the smell as the brake pads are so hot. Then you will get all the warning coming on as they are all linked to the braking sensors. My opc sorted it out quickly and replaced all the brake pads or anything that was exposed to heat caused by this fault. Hope this helps Regards Hugh
 
Thanks Hugh, That's useful. Brake related it is then.. Smell was so strong I thought it was going to catch fire. I'll let you know what transpires. Thanks, Simon
 
I would agree with Hugh as similar happened to my Cayman S after a period of non use, all kind of warning lights and brakes were stuck on. In my case since it has a clutch getting parts and replacing them took two weeks. I found it best to hook your foot under the pedal to return it but it tends to get worse the longer you drive it and my dealer is 35 mls away so I had a nerve racking drive. It's is rather concerning that this is still occurring as they said all new cars have the larger size bushes fitted, obviously not the case. Also be aware both pedal shaft and bushes on 991/ 981 are now made of plastic.
 
Happened on my C2S. OPC knew exactly what the problem was when I phoned it in and fitted modified brake pedal bushes to sort it. It was however accompanied by the brake lights being permanently on which was a dead giveaway. I was told by a following motorist the first time it happened (cleared itself without problem, presumably when the car cooled down). Second time was in the dark and it was obvious the brake lights were on permanently. Sharp push on the brake pedal cleared it but next time I used the brakes it was back on permanently again.
 
What concerns me is Simons car is only one year old. I was told all cars now have the modified bushes when mine had them fitted in Feb. 2014 Mine had done a long trip to Germany without any problem and then after a period of no use the fault occurred. I am wondering if there is some connection with lack of use. The OPC said it occurs when the footwell gets hot with heating but mine was when the engine was quite cold. Apparently some 991 have had full brake seizure and can't even be trailered to the OPC.
 
As I remember it, a few weeks after picking up my car on 1 March 2014 I was notified of the recall, by OPC who were quite keen that I brought the car in asap. Presumably by then Porsche knew it was a potentially serious fault. By contrast when I rang OPC about the current recall on the instrument cluster they said it could wait for the earlier of either going wrong or first service.
 
I've had the same issue on my 911-50. It's brake bushings related and caused the failure of PSM and ABS. OPC sorted it out within a day. It only occurred when the footwell got hot. Strangely though only after a year did the problem arise. I was unable to coast as the car would come to a halt.
 
ORIGINAL: lowndes As I remember it, a few weeks after picking up my car on 1 March 2014 I was notified of the recall, by OPC who were quite keen that I brought the car in asap. Presumably by then Porsche knew it was a potentially serious fault. By contrast when I rang OPC about the current recall on the instrument cluster they said it could wait for the earlier of either going wrong or first service.
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I was never notified of any recall being issued when my car suffered the problem in Jan 14 and they denied one had ever been issued, but the OPC were well aware of the problem and commented they had seen quite a lot of 991s needing updated brake pedal bushing. I did point out to them that this was a safety issue.
 
I heard if the car got unused for a few weeks with wet brake (ie car was washed just before being stored) this may seize the brake-anyone had a similar issue please?
 
Unlikely as the 'S' has PCCB's, but it is unwise to apply the handbrake when parked up for long periods. Just keep it in "Park" and use chocks if necessary. Regards, Clive
 
Clive, Thanks that tip re no handbrake for long periods. Wilco. Thing is I'd been out in it already that morning pootling around Trowbridge & all was ok. Only later when I collected wifey after having her nails done & then on our way to Bath did the problems start. A moral or two there ok. Anyhow a breakdown truck arrived Sunday am & it's on its way to Porsche Centre Bristol. Simon
 
Hi, Update.. Explained to me that the problem was faulty plastic bushings on the brake pedal. New ones being ordered. Being reassured that brakes were not harmed & to expect hot brakes anyway if car used on a track. All discs being checked anyway & anything untoward will be replaced. Simon
 
Hi Certainly brakes will get hot if car is used on track but that is totally different to your brakes been on for a long period of time, as i recall you said the smelll was immense. Your car has ceramics i assume so i would air on the cautious side. My brakes were only on for a short period and there was no immense smell (Steel brakes) but all pads were changed. Regards Hugh
 
Hi, Bristol OPC fitted new brake pedal bushes, or whatever they were. They sent me a video link of each disc on a walk around with each wheel off. Reassuring audio from the tech saying all's ok & little or no wear. None seemingly caused by the brake pedal bushes keeping the brakes on slightly. They put the car on a trailor & it's back. All appears fine and dandy. Hopefully that's the end of it & subject closed. Thanks, Simon
 
hi all, newbie here. I took my car to the local carwash recently and when I drove it away I tried the brakes, as you do, and they were non-existent. so I drove a good few miles to dry the PCCB off with a little bit of braking every now and them but they literally had no grab at all. when I pulled over (slowed down through engine braking and gears) to have a look, they were so hot they were almost glowing. the smell and smoke coming off them was horrendous. I take it the car wash people must have sprayed some sort of silicone or tyre shine on the tyre wall that went on to the disc. never again will I let them to that! scary stuff
 
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