car "stuck" after parked overnight?
12-10-2019, 12:38 PM
#1
Instructor
Thread Starter
car "stuck" after parked overnight?
This occur to my 2012 997.2 PDK c2s occasionally, looking to see if this is normal / if this is something I should worry about.
Sometimes after I park the car for a while (at least overnight. haven't seen this happen intra-day yet), when I start the car, e-brake off, and give it a tiny bit of gas to get the car to a rolling start, the car wouldn't budge. I can hear/feel the engine is responding to the throttle but the car just wouldn't move. Then I'd give it a little more more gas, the car would then "break loose" with a loud clunk and jerk from the rear... Feel like something along the drive train was stuck / broke loose would be my best way to describe it...
This doesn't happen every day, but had been happening at least a handful of times since I have the car from the summer. I'm going to start to pay more attention / document its occurrence to try to understand what's going on. Since I haven't been documenting I'm not entirely sure yet but I vaguely feel like it tends to happen after I drove the car in rain... Maybe the temporary rotor rust stuck the rotors to the pads? Also another thing is I always feel like after I drove the car there is some sort of burning smell coming from the rear... Makes me suspect if the pad is constantly dragging on the rotor or something? If it is, maybe it would explain both the smell and the "clunky / sticky start"?
Sometimes after I park the car for a while (at least overnight. haven't seen this happen intra-day yet), when I start the car, e-brake off, and give it a tiny bit of gas to get the car to a rolling start, the car wouldn't budge. I can hear/feel the engine is responding to the throttle but the car just wouldn't move. Then I'd give it a little more more gas, the car would then "break loose" with a loud clunk and jerk from the rear... Feel like something along the drive train was stuck / broke loose would be my best way to describe it...
This doesn't happen every day, but had been happening at least a handful of times since I have the car from the summer. I'm going to start to pay more attention / document its occurrence to try to understand what's going on. Since I haven't been documenting I'm not entirely sure yet but I vaguely feel like it tends to happen after I drove the car in rain... Maybe the temporary rotor rust stuck the rotors to the pads? Also another thing is I always feel like after I drove the car there is some sort of burning smell coming from the rear... Makes me suspect if the pad is constantly dragging on the rotor or something? If it is, maybe it would explain both the smell and the "clunky / sticky start"?
12-10-2019, 12:50 PM
#2
Drifting
Sounds to me like your rear parking brake isn't releasing. When you lower the parking brake handle, does it feel like it is under tension (it wants to go down) or does it feel somewhat loose or floppy?
The burning smell sounds like the shoes rubbing against the internal drum.
Do you live in an area where there is salt on the roads or a lot of rain? The mechanism could be rusted up and is occasionally sticking.
The burning smell sounds like the shoes rubbing against the internal drum.
Do you live in an area where there is salt on the roads or a lot of rain? The mechanism could be rusted up and is occasionally sticking.
12-10-2019, 12:50 PM
#3
Rennlist Member
Rotor rust most likely. Try skipping the parking brake altogether. Not sure why it’s even necessary to use it w PDK. Frankly I’m not sure mine is even connected!!
12-10-2019, 12:52 PM
#4
Instructor
Sounds exactly like what happens after I wash my car and rotors flash surface rust. Also, the burning smell is normal for these cars once they get up to temperature. My 997 before and now my Cayman both have this smell when parked after a long drive.
12-10-2019, 01:02 PM
#5
Drifting
Parking brake doesn't use the rotors or calipers. The parking brake is a traditional drum brake setup inside the drum of the rear rotor. There are springs that retract the shoes when the brake handle is down.
I suspect there is rust in the cable (most likely) or mechanism that is freezing this drum brake mechanism to the point where the retracting springs can't overcome it and the shoes.are still in contact with the drum as you drive.
It is also possible that something is broken inside the mechanism but you would almost.certainly hear some noise from the rear brakes if that were the case, as loose parts would rattle around back there.
I suspect there is rust in the cable (most likely) or mechanism that is freezing this drum brake mechanism to the point where the retracting springs can't overcome it and the shoes.are still in contact with the drum as you drive.
It is also possible that something is broken inside the mechanism but you would almost.certainly hear some noise from the rear brakes if that were the case, as loose parts would rattle around back there.
12-10-2019, 01:11 PM
#7
Instructor
Thread Starter
Parking brake doesn't use the rotors or calipers. The parking brake is a traditional drum brake setup inside the drum of the rear rotor. There are springs that retract the shoes when the brake handle is down.
I suspect there is rust in the cable (most likely) or mechanism that is freezing this drum brake mechanism to the point where the retracting springs can't overcome it and the shoes.are still in contact with the drum as you drive.
It is also possible that something is broken inside the mechanism but you would almost.certainly hear some noise from the rear brakes if that were the case, as loose parts would rattle around back there.
I suspect there is rust in the cable (most likely) or mechanism that is freezing this drum brake mechanism to the point where the retracting springs can't overcome it and the shoes.are still in contact with the drum as you drive.
It is also possible that something is broken inside the mechanism but you would almost.certainly hear some noise from the rear brakes if that were the case, as loose parts would rattle around back there.
And actually related to the e-brake, if anything, I think it's on the loose side. When I do use it (parked on slope) I feel like really need to pull hard so that it engage enough that the car won't roll...
Regarding to where I live - I'm in NY, the car was previously Omaha / mid west before I bought it this summer...
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12-10-2019, 01:21 PM
#8
Drifting
If the e-brake handle has no tension until you really pull hard on it, then your issue is almost certainly related.to the e-brake and the cable or mechanism is sticking.
If you don't feel good about pulling the wheels and rotors and checking it out, just take it to your dealer or a competent shop. They should be able to get things freed up and.working again. There's nothing sophisticated or special about that system.
If you don't feel good about pulling the wheels and rotors and checking it out, just take it to your dealer or a competent shop. They should be able to get things freed up and.working again. There's nothing sophisticated or special about that system.
12-10-2019, 01:27 PM
#9
Rennlist Member
You have to pull the parking brake like the Hulk would - that’s normal - to really engage it.
If you get some lockup in the garage that’s normal too if it’s damp or you just pulled in from the rain. Bottom line is if there’s no visible rust on the rotors from overnight and you still get the breaking free issue, then there’s another issue going on.
If you get some lockup in the garage that’s normal too if it’s damp or you just pulled in from the rain. Bottom line is if there’s no visible rust on the rotors from overnight and you still get the breaking free issue, then there’s another issue going on.
12-10-2019, 01:36 PM
#11
Three Wheelin'
The ebrake is drum style on the 911 on the inside of the rotor.
12-10-2019, 01:39 PM
#12
Rennlist Member
12-10-2019, 01:54 PM
#13
RL Community Team
Rennlist Member
Rennlist Member
2009 C2S 148K miles.
Tip: After washing my car, I drive it back and forth on my driveway and drag the brakes... wipes 'em and maybe some heat. Then next day (or after a rain), if I feel the stick, I press my brake pedal really hard... that seems to crush the rust bond and allows for a less dramatic release.
BTW, these emergency brakes are not "e"... they are old fashioned cables activated by arm muscles.
Peace
Bruce in Philly
Tip: After washing my car, I drive it back and forth on my driveway and drag the brakes... wipes 'em and maybe some heat. Then next day (or after a rain), if I feel the stick, I press my brake pedal really hard... that seems to crush the rust bond and allows for a less dramatic release.
BTW, these emergency brakes are not "e"... they are old fashioned cables activated by arm muscles.
Peace
Bruce in Philly
12-10-2019, 02:07 PM
#14
Three Wheelin'
Mine does the same thing so does my Tesla Model X rotors flash surface rust from sitting ... Both my electronic and manual brakes do this ...No big deal ...
12-10-2019, 02:34 PM
#15
Drifting
...and yet you talk about the rotors like they have something to do with the parking brake.
The OP has an obvious sticking parking brake, he smells hot brakes after he drives and he has to pull up the handle very far for the parking brake handle to engage. It's probably not a big deal, it's easily fixable, but none of those symptoms is normal.
But the OP is free to take any advice he chooses.
The OP has an obvious sticking parking brake, he smells hot brakes after he drives and he has to pull up the handle very far for the parking brake handle to engage. It's probably not a big deal, it's easily fixable, but none of those symptoms is normal.
But the OP is free to take any advice he chooses.