91 riviera bleeding brakes

I had to replace a brake line , when I began bleeding the brakes, the only one that bled anything was the front left, the others did nothing, do I need new bleeder valves ??

I had to replace a brake line , when I began bleeding the brakes, the only one that bled anything was the front left, the others did nothing, do I need new bleeder valves ??
try completly removimg bleeder from wheel cylinder or caliper if u get fluid flow then u know that your bleeder are glogged or have someone hepl u by pumping the brake several X's and hold them down while u try to bleed each one repeat steps after each wheel