Press on the brake peddle several times till it gets firm, than have someone push on the brake "normal" presserm, and get under there and on the brake caliper, will be like a little bolt, slowly turn it "open" and when brake fluid starts coming out, twist it tight, then have then press on the brake again and repeat till know more air comes out. Do the same on each side & each end, but after each side check your brake fluid and fill it back up as needed. Hope this helps.
Does this Blazer have four wheel disc Brakes? NEW ANSWER: There's no reason to bleed brakes if you did not open the system.( where brake fluid came out )
If you have to ask how to bleed brakes, do not do it yourself.
Having ABS does not change how you bleed the brakes. Bleed them as you would if it did not have ABS.
Loosen the bleed valve
First id have to get my back brakes on your Chevy 2500 silverado.
it takes 2 people,1 to pump the clutch pedal and the other to bleed it from underneath at the clutch slave cyl. but remember to keep the reservoir full at all time. it is kind of like bleeding the brakes on your car
Replace and bleed line
the most probable cause is, there is air in system, bleed brakes
The same way you would for brakes. Pump the clutch 4 or 5 time and hold down then open the bleeder valve to release the air. Is it the 2.8L V6 motor?
same way you would on any other vehicle
you can gravity bleed by opening up bleed valves,pump them up using a someone to open bleeder valves when there is pressure,vacuum bleed with a vacuum pump ,but you might have to use a scan tool to open up abs solenoids to bleed brakes.
Watch how you take them off and put them back on the same way. Then you have to bleed them since there drum brakes