Speed Control System Does Not Disengage W/Brakes Applied

1. Apply brake pedal and ensure brake lights work. If found satisfactory, proceed to step 2. If not found satisfactory, check stop lamp circuit.
2. Check to ensure proper operation of vacuum dump valve. If found satisfactory, proceed to step 3. If not found satisfactory, adjust or replace as necessary.
3. Check to ensure proper operation of servo. If found satisfactory, proceed to step 4. If not found satisfactory, replace servo.
4. Perform tests on amplifier. If found satisfactory, proceed to step 5. If not found satisfactory, replace amplifier.
5. Examine all connectors to ensure proper contacts.