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Q: Brake fluid leak

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All of the brake fluid leaked out of the rear driver's side wheel.

A: It sounds like you may have a bad wheel cyl...

It sounds like you may have a bad wheel cylinder. Unfortunately, wheel cylinders on drum brakes have rubber seals that will deteriorate over time and will not seal and will leak. I would recommend having a technician come out and perform a brake inspection and replace the rear brakes and wheel cylinders if needed.

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