Brake Master Cylinders push the braking liquid through the brake lines so that the pads pressure against the rotors to stop the car. The usual lifespan of a brake master cylinder is about 10-15 years, but can vary if you regularly change your braking fluid.
A few signs of brake master cylinder gone bad are:
We can get these cylinders repaired by fixing the leak in the seals. But the possibility of this repair differs based on the model and make of the car.