If it's a distinctive popping, the plastic piece in the MC might be getting stuck in the cylinder body. When it gets jammed, the rounded end of the piston pops in and out of it when you pull the lever.
You probably need the MC piston kit, which should cost like $15 MSRP. And if you're paying someone to do it, probably about $20-$40 labor depending if they've done a MC rebuild before or not.
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