Fixed brake issue by purchasing A1 CARDONE brake booster through Auto zone online for $160 and had my mechanic install for $200. Fixed issue for under $400 when dealer wanted close to $900!!! Replace brake booster and you will be good.
My check arrived on Tuesday. I paid $1,200 for the repair and received $400 back. No idea how the compensation was determined and why people are getting checks of different values, but the car is long gone (replaced by a Cayenne Turbo S) so I guess getting anything is better than nothing.
In researching this further, I actually found the settlement compensation table which explains why my check was for $400 - my repair was done at 106,000 miles. Here it is to assist others as the checks start coming in.