Drop in boost w/ ABS light

[Sveedy]

As the title states, I just today noticed a slight drop in boost, particularly when getting close to WOT, and at about the same time, the ABS light came on. It went off when I restarted the car, and stayed off till I once again got close to WOT. Then it came back on. This, along with the drop in boost, makes me think that there must be a common vacuum line that is failing under high boost. Any thoughts on where the culprit might be ? I see a rather large vacuum line coming off of the intake, and then heading under the air cleaner box, but I lose it after that. Drop in boost isn't major, but noticeable.
Thanks all !

Edit: I'm thinking that the large vacuum line from the intake goes to the brake booster.

[scot850]

Based on what I understand you are describing, that sounds like the pipe to the booster. Runs under the airbox.

It does sound like a vacuum leak, and if it is setting off the ABS light then it is work following that line and checking both ends in particular for splits.

Neil