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Old 12-29-2012, 09:33 PM   #2
Cobb Tuning
NASIOC Vendor
 
Member#: 4803
Join Date: Mar 2001
Location: Austin, DFW, Portland, SOCAL
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If it happens while pumping the brakes, which requires vacuum power, it would likely indicate an intake tract leak (probably post-TB). It's possible the brake booster supply hose itself is torn.

Cheers

Lance
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