Just bought an AF1 and paid for the install of the car side on my 2005 Chevy Suburban. My local installer noticed I don't have vacuum boost brakes but have hydro boost - it apparently works off of the power steering pump. He called SMI and they thought it would still work, but I did a test and turned off the engine going down a hill and tried braking myself. 3 pumps and my brakes were dead no matter how hard I stomp the pedal - would not stop the car. You would never know unless you tried this test.

I spoke with M&G and they said their unit works diferently and would absolutely work.

Looking for anyone who has some real-life answers to this problem. I am out $250 for the install and now have to de-install - don't want to make the same mistake twice.