brake problems

so my front left brake caliper will only pump one of my pistons. the second one after a few more pumps...and the middle piston dosent come out at all.

any ideas?

 

How's your fluid? Does the brake lever feel differently to you than it has in the past? Could be time to bleed them out if so.

 

bled the brakes the other day. this problem has been continuous for the past couple months.