I strongly suggest you go vacuum. I had 3 near death experiences with fickle power masters and replaced 3 complete power masters through the years costing ridiculously stupid money. Sorry, Not willing to pony up 800 bucks for a Russian Roulette brake system , so I tossed in the towel last year and put in a vacuum system in my GN and honestly it was the smartest upgrade I ever made and the only real difference is not fearing for my life every time I take a ride. I scored everything I needed in a local bone yard regal for a whopping 50 bucks. Its a afternoon job and total bolt in. The power master is junk , unpredictable, fails with no warning and damn dangerous and GM knew it, and pulled it fast after short use in the GNS and Estate wagons. Hydroboost systems are safe and dependable, but expensive and hog up a lot of space and plumbing. Go with what has worked without hardly a failure for 50 plus years and go vacuum!