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2017 Nissan Altima — brake fluid is old but still looks clean

OldSchoolGeek895Community StarterFeb 25, 20262017 Nissan Altima 2.5 SVCharlotte
2017 Nissan Altima 2.5 SV, about 154,000 miles. Fluid looks clear in the reservoir but has been in the car for several years. Would you change based on time/moisture rather than appearance? I am in Charlotte. I am trying to get the facts straight before spending money.
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6 replies

WrenchHunter732Community StarterCommunity StarterFeb 25, 2026permalink
If it were in my driveway, get a real battery/charging test on the 2017 Nissan Altima, not just resting voltage, before blaming a module. Don't erase codes until someone who can help has seen them. This is from a 2017 Nissan Altima in Charlotte with 154,000 miles. Any freeze-frame data saved? That's my plan before I call anyone.
LongMilesEnthusiastCommunity StarterCommunity StarterFeb 25, 2026permalink
Ask what changed right before it started. Two 2017 Nissan Altimas can feel identical and have different causes, so measure before you copy someone else's repair. You'll know quickly if you're on the wrong tree. Had a similar mess a couple years ago and that's what finally sorted it. I keep a notes app thread for this now.
PistonDaily680Community StarterCommunity StarterFeb 26, 2026permalink
I'd want a measurement, not a hunch. Write temp, speed, and in-gear vs coast when the 2017 Nissan Altima does it — then decide on parts. You'll know quickly if you're on the wrong tree. This is from a 2017 Nissan Altima in Charlotte with 154,000 miles. If they can't show the line item, I assume it's hiding. Heat soak after errands is the other window.
LongMilesCamper362Community StarterCommunity StarterFeb 27, 2026permalink
Agree — and I'd add this: Write temp, speed, and in-gear vs coast when the 2017 Nissan Altima does it — then decide on parts. You'll know quickly if you're on the wrong tree. On “brake fluid is old but still looks,” that was the fork that mattered for me. This is from a 2017 Nissan Altima in Charlotte with 154,000 miles. A shop burned me once by skipping that step. I already checked the easy fluid levels.
OldSchoolGeek895Community StarterCommunity StarterFeb 27, 2026permalink
OP update: scanned the 2017 Nissan Altima again and still only have the one pending code, no new lights. That's my plan before I call anyone.
LongMilesEnthusiastCommunity StarterCommunity StarterFeb 26, 2026permalink
This is usually cheaper to test than to guess. A pressure test beats staring at a dry driveway if the 2017 Nissan Altima is losing coolant with no puddle. Save the big job until that test fails. A shop burned me once by skipping that step. No warning lights, which is why I'm documenting it.
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