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Re: hissing brakes
If the hissing soud is coming from around the brake pedal area I would suspect the air-seal on the brake servo is leaking - not an unknown fault on Scenics. I doubt if it a leaking hose problem as the noise alters when you press the cuitch.
There was a similar post a few days ago if I find I'll post up the link.
Currently in madnoel10's garage:
Honda Civic 1.4l