Which component in the brake system can cause improper braking if it gets contaminated?

The master cylinder compensating port plays a crucial role in the hydraulic brake system by allowing fluid to return to the reservoir when pressure is released. If this port becomes contaminated, it can hinder the proper flow of brake fluid, leading to a situation where the brakes may not fully release or may not apply consistently. This restriction can cause a delay in brake response or uneven braking pressure, which directly impacts the braking performance and can pose safety hazards.

While other components like brake pads, brake actuators, and brake lines are also essential for the overall functionality of the brake system, contamination specifically affecting the master cylinder compensating port has a more immediate and critical impact on the hydraulic system dynamics, thereby leading to improper braking.