A hydraulic brake that pulls closer to the bar than it used to is telling you one of three things: air in the system, worn pads, or a rotor that has been contaminated.
Check the pads first. Most pads have a wear line; if the friction material is under 1 mm, new pads will restore most of the lever feel.
If the lever is firm but the bike does not stop, suspect contamination — usually oil or chain lube on the rotor. Clean the rotor with isopropyl alcohol and bed the pads in again.
If the lever is spongy and slowly sinks to the bar when held, that is air. A bleed is $30 plus fluid and takes about 30 minutes.
From the bench
Brake Service — from $20
Written quote before we start, 30-day workmanship warranty, and you can track the job from your phone.