Hiss followed by a knock or thump sound

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11-20-17, 08:25 AM

Louielace6

Driver

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Hiss followed by a knock or thump sound

Usually when I'm at a stop sign or light I get a 3-5 second hiss noise followed by what I believe is a quick knock?
Any one know what this is?
2000 Lexus GS300
Thanks Everyone

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11-22-17, 04:33 AM

newgsman

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Brake master cylinder is doing its thing. It is normal for these cars.

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