What Causes a Car's Brakes to Alternate Between Being Hard and Soft?

[MacDylan]

When a car's brakes alternate between being hard and soft, it is usually due to a damaged return spring. Replacing the return spring should resolve the issue. Below is relevant information about automotive brake fluid: Function: The role of brake fluid is to transmit hydraulic pressure when the brake pedal is pressed. The master cylinder increases the pressure of the brake fluid, causing the pistons in the wheel cylinders to extend under the action of the sealing rubber cups. This leverages the principle of mechanical advantage to apply force on the brake discs and pads, enabling the braking function. Replacement Interval: Most people believe that brake fluid replacement is solely based on time and mileage. However, it also depends on the climate and humidity of the region where the vehicle is used. In tropical regions, replace annually or every 20,000 kilometers; in cold regions, replace every two years or 40,000 kilometers; and in temperate regions, replace every three years or 60,000 kilometers.