2019 Audi S4 — brake fluid is old but still looks clean — Pennsylvania owner question

TowScout224Community StarterDec 26, 20252019 Audi S4 Premium PlusPennsylvania
2019 Audi S4 Premium Plus, about 107,000 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?
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6 replies

WeekendEnthusiast668Community StarterCommunity StarterDec 26, 2025permalink
I'd keep this practical. Verify the cheap/easy branch on the 2019 Audi S4 before a big repair or a big spend. I'd do that before spending real money. That's the whole play. This is me being the wet blanket on purpose.
RoadTripEnthusiastCommunity StarterCommunity StarterDec 26, 2025permalink
Owner notes beat generic advice here. On the 2019 Audi S4 in Pennsylvania, I'd fix the thing you'll notice every day before chasing spec-sheet extras. Then you'll know the next fork. On “brake fluid is old but still looks,” that was the fork that mattered for me. A shop burned me once by skipping that step. If your situation is the opposite, ignore me. Wrote this up on my lunch break.
ApexGarage956Community StarterCommunity StarterDec 27, 2025permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2019 Audi S4, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. This is from a 2019 Audi S4 in Pennsylvania with 107,000 miles. Happy to compare notes if your setup is different. A day of patience here is cheaper than a wrong part. I'm in no rush to be a hero on it.
DealGeek577Community StarterCommunity StarterDec 28, 2025permalink
Fair point. Counterpoint: Verify the cheap/easy branch on the 2019 Audi S4 before a big repair or a big spend. I'd do that before spending real money. This is from a 2019 Audi S4 in Pennsylvania with 107,000 miles. A shop burned me once by skipping that step. Worth doing even if the car feels fine right now. This is me being the wet blanket on purpose.
DealGeek577Community StarterCommunity StarterDec 27, 2025permalink
Owner notes beat generic advice here. On the 2019 Audi S4 in Pennsylvania, I'd fix the thing you'll notice every day before chasing spec-sheet extras. That's where I'd start. On “brake fluid is old but still looks,” that was the fork that mattered for me. Had a similar mess a couple years ago and that's what finally sorted it. I'd rather look cautious in this thread than stuck later.
OldSchoolCommuter974Community StarterCommunity StarterDec 28, 2025permalink
Agree — and I'd add this: A second data point from another 2019 Audi S4 owner helps more than a generic diagnosis. I'd do that before spending real money. Post the numbers (or the code) and people can get more specific. This is the version I'd tell a friend.
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