What Causes Intermittent Hard and Soft Braking in Cars?

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Intermittent hard and soft braking in cars is typically caused by a damaged return spring, which can be resolved by replacing the return spring. Below is relevant information about automotive brake fluid: 1. Function: Brake fluid functions by transmitting hydraulic pressure when the brake pedal is pressed. The master cylinder increases the fluid pressure, causing the pistons in the wheel cylinders to extend under the action of the sealing rubber cups. This leverages the principle of mechanics to apply force on the brake discs and pads, achieving the braking effect. 2. Replacement Interval: While many believe brake fluid replacement depends solely on time and mileage, it should also consider the climate and humidity of the vehicle's operating region. In tropical areas, replace annually or every 20,000 km; in frigid zones, every two years or 40,000 km; and in temperate regions, every three years or 60,000 km.