Troubleshooting a brake booster leak

[cluck]

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?

[mcbit500]

You may have a different issue, but the most common cause of this problem is covered here  http://www.renntech.org/forums/topic/31161-brake-booster-faulty/

[wrinkledpants]

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.  

[cluck]

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. 

[jagman1]

Where was the crack?  I've been hunting a brake boost leak for years and have checked all the typical locations and found nothing.  Each new report of someone finding a crack I use to narrow in on my leak.