[95 S_Trucker]

There is a pin hole in the diapram. Unbolt the master cylinder. You can leave the brake lines hooked up. Make sure there isn't a brake fluid leak at the rear of the master cylinder. Thats the biggest cause of failed boosters. Then there are 4 nuts holding the booster to the firewall. The clip that holds the booster to the pedal rod is kinda a pita. Id have a new one handy. I usually break them upon removal.