brake line whistling at fire wall on driver's side
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1991 Jeep Wrangler Question: why is the brake line whistling at fire wall?
Answer #1patrick mannion from Greg Solow's Engine Room, September 25, 2011, 10:16Master
The brake line should not whistle. If it is a metal line carrying fluid it may vibrate with some engine resonance if it is not properly secured. If it is a vacuum hose the check valve may have a problem, or you have a vacuum leak in which case the engine would run poorly.