FIRST I LIKE TO THANK EVERYONE ON THIS SITE FOR ALL THE KNOWLEDGE THAT HAS BEEN PRESENTED, IT HAS HELPED ME A LOT IN THE PAST AND HOPE IT WILL HELP AGAIN!!!!
***1996 CHEVY BLAZER 4x4 LS******
I RECENTLY CHANGED MY BRAKES AND DID SOMETHING REALLY STUPID. I LEFT THE RESEVOIR TOP OPEN AND WHEN I WENT TO PUMP THE BRAKES FLUID SHOT EVERYWHERE. ONLY REASON WHY I REALIZED THAT WAS CUZ I COULD HEAR IT SUCKING AIR IN. I FILLED IT BACK UP AND BLEED EACH TIRE TWICE WIT THE BLAZER OFF AND ONCE WIT IT ON. THE PEDAL IS ROCK HARD WHEN THE BLAZER IS OFF BUT AS SOON AS I TURN ON THE BLAZER THE PEDAL GOES TO THE FLOOR. DO I NEED THE SCAN TOOL TO GET THE AIR OUT OF THE SYSTEM OR CAN IT BE BLEED WITHOUT IT? OR IS THERE ANY SUGGESTIONS THAT I NEED TO DO?

 

First thing I would do is turn off your CAPS LOCK.
I use to use all caps until someone told me to quit yelling at them.
I know that was not your intent.

I copied this from My ALLDATA Account.
Hope this helps.

ANTILOCK BRAKE SYSTEM (ABS) BLEEDING PROCEDURE

NOTE:
The two person bleed procedure is required when installing a new electro-hydraulic control unit, or when air is suspected to be trapped in the valve body.

Do not re-use brake fluid used during bleeding.
Vacuum, pressure, or gravity bleeding may be used for base brake bleeding only.

Two Person ABS Bleeding Procedure

Raise the vehicle to gain access to the system bleed screws.
Begin by bleeding the system at the right rear wheel.
Install clear hose on the bleed screw. Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid.
Open the bleed screw 1/2 to 1 full turn.
Slowly depress the brake pedal until it reaches its full travel and hold until the bleed screw has been tightened. Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to turn to the home position. Repeat until clean, air free brake fluid is present at the wheel bleed screw. This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid-level every 4 to 6 strokes of the brake pedal to avoid running the system dry. Repeat steps 3 though 5 on the left rear, then right front,then left front.
Use the scan, sod. to run Function Test four time consecutively while applying the brake pedal firmly. Remove foot from:the brake pedal between each test.
Rebleed all four wheels using steps 3 through 5 to remove the remaining air from the brake system.
Evaluate the brake pedal feel before attempting to drive the vehicle and re-bleed as many times as necessary to obtain appropriate pedal feel.


Hers's a start for you.

Good Luck. - Mark K