My humble Alto is facing this problem for the past 6 months.
I am feeling lack of brake bite. To explain clearly, the first 1 to 2 inches of the brake pedal has no effect on the brake. But the braking happens at the end of the pedal. The pedal travel is not long and has sufficient gap from the firewall.
Brake pads are TVS apache ones that has run 10k kms. Rear brake shoes are cleaned and adjusted. Month back mechanic suggested replacing the master cylinder which was promptly done using MGP MC.
Even after replacing the MC and bleeding the brakes with more than 1 litre brake oil, the brake bit is not there. But sudden braking and pedal travel is good. Only initial bite is missing.
Did all tricks such as cleaning the pads, lubrication of caliper pins, replacing rear wheel cylinders. But there is no bite and lack of response for this 2 inch pedal travel.
Earlier the brakes were super sharp. Just a little tap and you can feel the brakes are engaged. Now this is gone even after replacing all the parts. MASS is also clueless. Folks kindly help