hi, welcome to the boards.....
here are the steps to try. they came from another forum site, and several people have tried it and been pleased.
-Remove the two nuts holding the master cylinder to the brake
booster, they are 1/2in bolts.
-Once the nuts are removed, slide the master cylinder straight away from the brake booster. As I mentioned before there will be alot of resistance due to the vacuum build up. You can rock the master cylinder back and forth and you will here the vacuum relieving, once it does you can slide the master straight back.
-Locate the rubber o ring and ensure it is still in place. It fits between the master cylinder and the brake booster.
-With the master cylinder pulled back(leave all lines and wires attached) just position it out of the way. You will clearly see a 7mm bolt that is threaded into the rod sticking out of the brake booster. The rod has a grooved shaft that you will need to hold with needle nose pliers to keep it from turning while backing out the 7mm bolt.
-Back the 7mm bolt out of the rod(counter clockwise) about 1/2 turn or how much you see fit. I tried half turns until I got the brake pedal to where I wanted it. It is possible loosen the bolt to much to the point where your brakes
will drag, thats why I went in such small increments. It took mine about 1.25 - 1.5 turns to get it right.
-Bolt the master cylinder back in place and your done.
hope this helps you !!!