If the brake overheat, brake fading could lead to an increase in needed stopping distance. Should a driver not anticipate the extra stopping distance, this condition could cause a crash.
Service Brakes, Hydraulic — Foundation Components — Master Cylinder
Vehicle description: Non-ABS equipped passenger vehicles. The brake master cylinder piston retainer snap ring may have been bent inward during the assembly process. The master cylinder piston may be in a "brake applied" position due to the damaged piston retainer snap ring. When the piston is in the applied position, the fluid compensation ports are closed which results in a brake drag condition.