Brakes went out on my 69 firebird, soft pedal. Relaced master cylinder, no change. Boster seems ok. I'm working out of town all week, so the kid tried bleeding the brakes. Snapped off the two front bleeders, kids. Anyway whats the best way to replace bleeders and what the heck made the brakes go away? It's front disk by the way. Here I though I'd come home and relax, not. Thanks Ted

Take an intact bleeder screw to NAPA. They seem to always have the best selection.

Bleed the brakes and then see how they are.

In my exerience, changing out the MC usually cures soft pedal. Did the pedal get firmer if you pumped it and then slowly moved to the floor as your foot was on it? That's the seals leaking by.

recommended way to remove a snapped bleeder is to replace the cylinder/caliper.

there are ways, but for a 69 'bird, the cylinders or calipers are cheap enough, i would just replace them if you cant get some vicegrips to work on the snapped bleeder. other ways are more involved, and not worth it for a $20 caliper.

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there may have been air in the system from the previously bad master, and replacing the master without bleeding did not remove it. a bypassing master often will not put air in the system, but can. a leaking master will nearly every time.

check for any leaks in the entire system, and inspect and adjust shoes. inspect brake operation, parts, lines, and hoses at all 4 wheels and under body.

Scott is exactly right about replacing the calipers. You might want to replace the brake hoses that lead to the calipers too. Replace these parts and do a thorough bleeding and chances are your brakes will be good. If you still have problems, you have narrowed down the list of causes.
Jim

scott is correct.you can get loaded calipers at auto zone for 50 bucks a pair and they come with new pads and hardware.otherwise you will have to get a cutting torch out and heat the caliper and use an easy out to remove the broken bleeder screw.once you do that you have to rebuild the caliper anyway so why aggravate yourself.be shur your rear brakes are adjusted properly when you bleed the brakes.

I had soft pedal one day too...out of the blue. No leaks, no low fluid, everything mechanical appeared fine.

Cheap little vacuum check valve wasn't checking. What I was feeling was a mix of power assist/no power assist but for some reason the pedal felt soft, not hard.

Went to the GMC truck dealer and bought NOS over the counter. Installed it, tested it, and everything has been fine.