The brake system is powered by a hydraulic pump to push the caliper to clamp the brake disc. Raw friction (disc brake), or push the brake pad and the brake drum to rub (drum brake).
Therefore, like the above situation, it may be due to the pressure of the hydraulic oil when the cold car is sticky. Lag, hydraulic oil pump or transmission pipe is out of pressure, resulting in failure to provide brakes in time Force, need a hot car for a certain period of time, the hydraulic oil viscosity is reduced, in order to better pass Pressure, normal braking force.