Pushing a piston too far back?

in Workshop
Hey there,
So I've got a bike with sram rival hrd, I've got some play in the lever, so I thought it must be a sticking piston, I then proceeded to push out the pistons slightly, then push them back in, I pushed the pistons ever so slightly back in more than flush with the caliper. I then put the pads and wheel back in to find that the right piston was moving less but the left piston wasn't moving in at all. I then proceeded to prevent the right piston moving in and squeeze the lever. Now the pistons move in but not enough to properly contact the rotor, there is also a lot of more of lever play. What could be causing this? And how could I go about fixing it if possible. Keep in mind I work at a bike shop. My guess would be that I"ve allowed a lot of air into the system and it needs to be bled.
Cheers
So I've got a bike with sram rival hrd, I've got some play in the lever, so I thought it must be a sticking piston, I then proceeded to push out the pistons slightly, then push them back in, I pushed the pistons ever so slightly back in more than flush with the caliper. I then put the pads and wheel back in to find that the right piston was moving less but the left piston wasn't moving in at all. I then proceeded to prevent the right piston moving in and squeeze the lever. Now the pistons move in but not enough to properly contact the rotor, there is also a lot of more of lever play. What could be causing this? And how could I go about fixing it if possible. Keep in mind I work at a bike shop. My guess would be that I"ve allowed a lot of air into the system and it needs to be bled.
Cheers
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