hi everyone.i removed my master cylinder to replace the brake lines.when the master cylinder was off i didnt mean to push the brake pedal.now that i put it all back together the brake pedal goes all the way to the floor,they wont bleed.and my brake light on the dash is on

 

What year Blazer do you have?

Bleeding these systems can be challenge if you have an ABS system. The official procedure includes a step to activate the ABS solenoids using a scanning tool. There are aftermarket scanning tools that can do this.

Short of that, you might be able to get some pedal by doing a gravity bleed.