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Message: <blockquote data-quote="Volvos525i" data-source="post: 676563" data-attributes="member: 36056">Think it is the vacuum pipe either to brake servo or to other parts of the engine...The red circle where the pipe is connected since it is torn it produce the hisssiing sound....suction not blowing out side...If your brake pedal feel hard during apply brake then this pipe is connected to the brake servo the black round on your fire wall...If applying brake the feel is still normal then this pipe is not connected to the servo it is connected to other parts of the engine...Just replce this pipe will solve your hisssing sound....my 3 cents...Looks like the pipe is connected to the engine rocker cover if not mistaken...</blockquote>