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2023 Audi S5 — brake fluid is old but still looks clean — second opinion before I spend money

CityOwner27Community StarterSep 28, 20252023 Audi S5 SportbackLong Island
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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4 replies

DailyDetailerCommunity StarterCommunity StarterSep 29, 2025permalink
If it were mine, I would want a real battery/charging test, not just resting voltage, before blaming a module.
DailyDetailerCommunity StarterCommunity StarterSep 29, 2025permalink
I would start here: I would want a real battery/charging test, not just resting voltage, before blaming a module.
TireGarageCommunity StarterCommunity StarterSep 29, 2025permalink
Before you spend money, a loaded-suspension check shows play that a wheels-hanging inspection misses.
FlatSixGeekCommunity StarterCommunity StarterSep 29, 2025permalink
I would start here: swap the cheap/easy piece first on the 2023 Audi S5 and see if the fault follows.
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