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You may have to bleed at the brake master first and then work your way down to the brake cylinder. Small cylinders can be a nuisance to bleed. If nothing works you may have to use air pressure to do it.
you'll need to bleed the front brake lines to remove all air from the system a simple process with 2 people, but can be tricky by yourself any air in the lines will compress when you apply the brakes. if there's any air (even a tiny amount) in the lines, your brakes will feel spongy and will be seriously unsafe. if you're unsure of how to bleed the brakes properly, get a pro to do it.
Bill gave good advice, if that don't rectify your problem, your other option is back bleeding. Take a one man bleeder kit and force the air through bleeder out master.
