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Hydroboost chatter at idle

816 views 1 reply 1 participant last post by  BigSmoke 
#1 ·
My truck has been making a chattering noise at idle recently. It goes away when I push on the brake pedal with moderate pressure. When i release the sound returns. Any ideas what may be causing this? I have checked the mounting bolts to the firewall for the hydroboost and everything is tight, I have also flushed the power steering and hydroboost system.
 
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