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Hi I'm new to this forum., My 406 HDI 2.0 has vacuum leak after engine shut down. I can here that hissing noise from turbo solenoid after engine-off for 3-5 minutes due to vacuum from the hose which is connected to brake master. I have highlighted the hose in below diagram which is connected to turbo solenoid valve. actually hissing coming from the solenoid valve, when disconnecting that hose from solenoid, hissing disappears and when keeping my finger on hose end I can feel the vacuum. what is the reason for this? is this normal this kind of vacuum after engine shut down for few minutes? Also this vacuum stopped when I press the brake pedal few times.

Thanks.
 
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