刹车变软、行程变长或制动力下降：哪些现象不能等下次保养？

A sudden change in pedal travel, braking force or pedal feel deserves prompt professional attention, especially with warnings, leaks or a burning smell. Stop safely and arrange inspection rather than waiting for routine service. Heat-related pad fade and fluid vapor lock are possible mechanisms, not diagnoses that can be confirmed from a forum post. Record the driving conditions and recent brake work without touching hot parts or repeatedly braking hard. Request findings for the relevant hydraulic, friction, assistance and electronic systems. Do not mix fluids or attempt bleeding based on a general article. Symptoms disappearing after cooling do not prove that the problem is resolved.