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2017 Porsche 911 — new pads squeal at parking-lot speeds

QuietWeekend186Community StarterOct 28, 20252017 Porsche 911 Carrera STexas
Pads and rotors were replaced recently and stopping performance is good, but there is low-speed squeal. Hardware was cleaned and lubricated. How long would you give bedding before inspecting again?
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23 replies

QuietWeekend186Community StarterCommunity StarterOct 28, 2025permalink
It did new pads squeal at parking-lot speeds twice this week, both times after sitting. No change in mileage feel. Parking it somewhere I can hear it better next time.
TrackTraveler521Community StarterCommunity StarterOct 28, 2025permalink
Ask what changed right before it started. If a shop can't duplicate it on the 2017 Porsche 911, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. This is from a 2017 Porsche 911 in Texas. Had a similar mess a couple years ago and that's what finally sorted it. Only after sitting overnight so far.
NoMarkupGal502Community StarterCommunity StarterOct 28, 2025permalink
This is usually cheaper to test than to guess. Write temp, speed, and in-gear vs coast when the 2017 Porsche 911 does it — then decide on parts. Save the big job until that test fails. That's the whole play. If that fails I'll eat the diagnostic fee.
DieselTraveler475Community StarterCommunity StarterOct 29, 2025permalink
I hear you, though I'd still want a second check. A pressure test beats staring at a dry driveway if the 2017 Porsche 911 is losing coolant with no puddle. That's the branch I'd chase this week. On “new pads squeal at parking-lot speeds,” that was the fork that mattered for me. I'd want that in writing, not as a promise. This is the filter I use when the thread starts repeating itself. No warning lights, which is why I'm documenting it.
QuietWeekend186Community StarterCommunity StarterOct 28, 2025permalink
OP update: scanned the 2017 Porsche 911 again and still only have the one pending code, no new lights. Might be overthinking it, but I'd rather overthink than overspend.
GarageGarage716Community StarterCommunity StarterOct 28, 2025permalink
Log the conditions before you spend. Two 2017 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. On “new pads squeal at parking-lot speeds,” that was the fork that mattered for me. Keep sale price, fees, and rate as three different conversations. Climate here is different, so treat that as a local data point. Not interested in a five-hour wait for a shrug.
QuietWeekend186Community StarterCommunity StarterOct 28, 2025permalink
Tried a second charger / second scan and the story on the 2017 Porsche 911 didn't change. This is the version I'd tell a friend.
DealBuyer603Community StarterCommunity StarterOct 28, 2025permalink
Intermittent stuff lies if you only catch it once. Move a coil or plug on the 2017 Porsche 911 if it's cylinder-specific and see whether the code follows. Save the big job until that test fails. On “new pads squeal at parking-lot speeds,” that was the fork that mattered for me. This is from a 2017 Porsche 911 in Texas. Take it or leave it — that's what I'd do. If it repeats twice more I'll book time.
DieselTraveler475Community StarterCommunity StarterOct 28, 2025permalink
Start with the test that can prove you wrong. If a shop can't duplicate it on the 2017 Porsche 911, bring a video plus freeze-frame data, not just a story. Don't erase codes until someone who can help has seen them. I'd want that in writing, not as a promise. Cold start is when I can actually reproduce it.
UsedCarDIYer737Community StarterCommunity StarterOct 28, 2025permalink
Start with the test that can prove you wrong. Swap the cheap/easy piece first on the 2017 Porsche 911 and see if the fault moves. That's the branch I'd chase this week. Happy to compare notes if your setup is different. This is the version I'd tell a friend.
OldSchoolNerdCommunity StarterCommunity StarterOct 28, 2025permalink
I'd want a measurement, not a hunch. Write temp, speed, and in-gear vs coast when the 2017 Porsche 911 does it — then decide on parts. Save the big job until that test fails. Time, temperature, and whether it's in gear are the notes that actually help a shop. I refuse to clear codes until someone else sees them.
TrackTraveler521Community StarterCommunity StarterOct 29, 2025permalink
I wouldn't throw parts yet. If a shop can't duplicate it on the 2017 Porsche 911, bring a video plus freeze-frame data, not just a story. Save the big job until that test fails. Had a similar mess a couple years ago and that's what finally sorted it. Might be overthinking it, but I'd rather overthink than overspend.
BrakeGuy46Community StarterCommunity StarterOct 29, 2025permalink
If it were in my driveway, move a coil or plug on the 2017 Porsche 911 if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. This is from a 2017 Porsche 911 in Texas. Had a similar mess a couple years ago and that's what finally sorted it. I'd sleep better after that step, even if it finds nothing. I'm keeping receipts and dates in one folder.
NoMarkupGal502Community StarterCommunity StarterOct 29, 2025permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2017 Porsche 911 is losing coolant with no puddle. That's the branch I'd chase this week. Stop there until you know. I'm keeping receipts and dates in one folder.
UsedCarDIYer737Community StarterCommunity StarterOct 29, 2025permalink
I'd want a measurement, not a hunch. Two 2017 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. Save the big job until that test fails. Post the numbers (or the code) and people can get more specific. I'd sleep better after that step, even if it finds nothing. I'll update if anything new shows up.
DealBuyer603Community StarterCommunity StarterOct 29, 2025permalink
Log the conditions before you spend. If a shop can't duplicate it on the 2017 Porsche 911, bring a video plus freeze-frame data, not just a story. You'll know quickly if you're on the wrong tree. On “new pads squeal at parking-lot speeds,” that was the fork that mattered for me. Just my two cents from doing this recently. That's my plan before I call anyone.
BoostDriverCommunity StarterCommunity StarterOct 29, 2025permalink
Log the conditions before you spend. Two 2017 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. If the cheap test changes it, stop and reassess. On “new pads squeal at parking-lot speeds,” that was the fork that mattered for me. If they can't show the line item, I assume it's hiding. I already checked the easy fluid levels.
OldSchoolBuilderCommunity StarterCommunity StarterOct 29, 2025permalink
This is usually cheaper to test than to guess. Two 2017 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. Save the big job until that test fails. I'd want that in writing, not as a promise. Make the next action something you can finish this week. This is me being the wet blanket on purpose.
ApexSeller168Community StarterCommunity StarterOct 29, 2025permalink
Intermittent stuff lies if you only catch it once. Two 2017 Porsche 911s can feel identical and have different causes, so measure before you copy someone else's repair. Don't erase codes until someone who can help has seen them. On “new pads squeal at parking-lot speeds,” that was the fork that mattered for me. This is from a 2017 Porsche 911 in Texas. That's the whole play. Not driving it hard until I know more.
QuietWeekend186Community StarterCommunity StarterOct 29, 2025permalink
OP update: scanned the 2017 Porsche 911 again and still only have the one pending code, no new lights. I'll poke at it this weekend.
QuietWeekend186Community StarterCommunity StarterOct 29, 2025permalink
Tried a second charger / second scan and the story on the 2017 Porsche 911 didn't change. Doing the boring step first on purpose.
OldSchoolNerdCommunity StarterCommunity StarterOct 30, 2025permalink
I'd push back a little: Move a coil or plug on the 2017 Porsche 911 if it's cylinder-specific and see whether the code follows. If the cheap test changes it, stop and reassess. Write the result down so the next test isn't a repeat of the last one. Make the next action something you can finish this week. Doing the boring step first on purpose.
CityHunter840Community StarterCommunity StarterOct 29, 2025permalink
If it were in my driveway, capture voltage while the 2017 Porsche 911 is actually failing — after it restarts you've lost the clue. Don't erase codes until someone who can help has seen them. This is from a 2017 Porsche 911 in Texas. Have you gotten a second quote in writing? Not trying to scare you — just skip the expensive first guess. Happens in gear, not in park, for what that's worth.
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