With the Key OFF!!!, Fully pump the brake pedal like 20 or 30 times. CAUTION: It is VERY important to do this as this will depressurize the Accumulator of the 2,600 psi or so that it is holding. DO NOT turn the ignition switch on after you have depressurized the system or you'll have to do it again. I removed the negative battery cable but some often just pull the ABS Fuse instead so no power can go to the pump. To remove the accumulator, you will need an Allen wrench to fit into the top of it. You'll notice the new one does NOT have this allen on top. Use a box end wrench on the end of the allen wrench for some leverage if needed. It unscrews counter-clockwise. Once it is broke free, it should unscrew by hand fairly easilly. Put a little clean brake fluid on O-Ring on the new Accumulator and screw it into the pump clockwise. Get it tight with your hands only, THINK it is only like 25-30ft lbs of torque. Turn key on and you should hear the pump motor fill the accumulator which may take about 30 seconds. Some fluid may leak during removal so don't let it get on your fender paint...