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Troubleshooting a brake booster leak

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I pulled the skid plate off my '04 TT to do an oil change and found this very sticky substance that had dripped down the rubber hose. I have had a "Brake booster workshop" light on the dash but my braking wasn't being affected. I think I found my leak.


This is driver side front. Do you all think I'm on target?



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Agreed.  If that's the driver side, that could be engine oil leaking out of the charge pipe going into the intercooler.  It's a cheap or-ring to fix it.  Most common brake booster issues stem from the hoses up near the washer reservoir.  Could be a cracked hose, or a cracked check valve.  

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Thank you both very much! You were both right. I pulled the small plastic piece by the wheel well and found that a lot of oil had been leaking somewhere around my driver side intercooler. I'll have to address that later. But sure enough, there was a 2" crack just underneath the check valve(?). Appreciate the input. 

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