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post #1 of 4 (permalink) Old 20th February 2010 Thread Starter
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hissing brakes

i've currently got an 02 scenic and the brakes make a constant hissing sound. the noise stops when u press the clutch or the brakes but otherwise its constant. does anyone know what the cause is and maybe the cost?
many thanks
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hissing brakes Brakes/Hubs hondo 3 1691 20th February 2010 01:56 PM
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post #2 of 4 (permalink) Old 20th February 2010
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Re: hissing brakes

hi and welcome to the forums

it sounds like a loose hose between the air intake and the (brake)master cylinder/servo (the big round thing at the RHS rear of the engine bay. it uses the suction from the air intake of the engine to power the brakes, sometimes the rubber collar where the hose plugs into shrinks or gets knocked and starts to leak air into the servo(the hissing your hearing).
also, check to see that everything is secure, if a nut has come loose it might be moving a bit when you press on brake/clutch.

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post #3 of 4 (permalink) Old 20th February 2010
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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.
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post #4 of 4 (permalink) Old 20th February 2010
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Re: hissing brakes

Hello fi.miles Welcome to the forum.

The prior issue that madnoel10 refers is below

Please click here
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brakes , hissing

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