I bought a 2012 Mazda CX-9 with 22" aftermarket wheels and had them changed back to stock 18" wheels (standard Touring size.) Now the brakes are harder to press and roll a little after stopping. If I push down all the way I hear a hissing noise. Also, if I can hear a faint air letting out noise when I break. From what I've read could be break booster? But wondering if it could be something they did when changing to new wheels / tire size. Thanks