What Causes the Lack of Braking Force in the First Half of the Brake Pedal Travel?

[VonStephanie]

The lack of braking force in the first half of the brake pedal travel can be attributed to insufficient brake fluid pressure (due to low fluid level in the master cylinder, ruptured brake lines, leaking pipe connections, or clogged fluid passages), air in the brake system, excessive free play in the brake pedal or excessive brake clearance, poor contact or severe wear of the brake shoe friction lining, or oil contamination. Other causes include wear or scoring of the master cylinder, wheel cylinder pistons, or cylinder bores, as well as aging or damage to the rubber seals. Below is more relevant information: Vehicle Braking: Vehicle braking refers to the act of stopping the vehicle, where braking force is the maximum rolling friction achievable. This is because friction drops suddenly when rolling transitions to sliding—maximum rolling friction is greater than sliding friction. This is why vehicles are equipped with anti-lock braking systems (ABS). Braking performance is one of the primary characteristics of a vehicle, directly related to driving safety.