With time I think Brake Boosters loses the originality and effectiveness, that is why you might feel that.
5K for Brake Pads is insane, please save your hard earned money from them, you will get MK genuine pads in Rs. 800 only from the open market. Some good quality carbon ones are available in Rs. 1200 also and that is max.
How to improve braking in such old cars:
- Do not press brakes repeatedly for stopping, decreasing speed.
- Install broader tyres, 175/70/R13. Better brand names like Yokohama will give better road grip and excellent handling, as well as emergency braking.
- Check and maintain Brake oil with a good quality one (Seiken).
- Check for air in braking system