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That sound it the air being aloud to escape from the air system though the quick release valve. This usally happens when the driver has applied the parking brakes. But, it can happen during other times you dont want it to.

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Q: What is the air sound coming from the brakes?
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brake booster could be bad the seal around the rod that hooks to the brake pedal is leaking

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Just know that if that is happening you are in serious trouble as it means that your brakes are leaking. In MLs the brakes use air pressure so if there is a hissing sound it means air is leaking thus your brakes could possibly fail. The best solution is to go to a registered Mercedes Benz garage so they can fix the problem. Alternatively if you dont have the money you could pretend that there is no noise and eventually you brakes will fail and you'll be in an accident i.e. GET YOU BRAKES FIXED AS SOON AS POSSIBLE

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