I faced Similar issues fee months ago. Contacted Suzuki 3S(infact they claimed themselves as 7S), they went for Complete Brake System overhauling.
In that package, they replaced Master cylinder, slave cylinder, proper bleed, brake pads changed , disc resurfacing (Done from outside as they were doing replacement which was too costly), also adjusted brake pedal
After that overhauling practice, everything went fine, Brake pedal however seems too hard/stiff than before and it started working as soon as you just touch pedal but no jerk, no halt..Overall smooth processing