Chrysler
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Brake Switch Performance Circuit Conditions
Cause:
    Engine running at cruise speed followed by 16 Accel and Decel periods (30-0 mph), then the PCM detected that the Brake Switch signal did not cycle from low to high at all

Ford
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Brake Switch Circuit Conditions
Cause:
    Engine running in gear or in deceleration mode and the PCM did not detect any brake switch signals

Generic
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    Brake Switch "B" Circuit

GM
Type:
    Powertrain - Transmission - ISO/SAE Controlled
Description:
    TCC Brake Input Circuit Conditions
Cause:
    No VSS codes set, VSS over 35 mph for 10 seconds, then back to 0 mph 5 times and PCM did not detect any change in Brake status.