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Hissing sound when forks compress

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Short and simple, guys. Last couple times out on the bike, I've noticed what sounds like a hiss of air when my forks compress. At least I think it's from the forks. I've heard it at low speeds when going over railroad tracks and when turning into an uneven driveway. Is that normal? Could it be the fork seals? I'll do more checking in the next couple days. Anything else I should check?