Vacuum Test: A4

Disconnect vacuum hose from vacuum pump. Press actuator diaphragm in, then plug hose at vacuum pump. Actuator diaphragm should remain in place. If actuator does not remain in place, check for vacuum leak and repair as necessary. If no problems are found, go to CIRCUIT TESTS  .

Fig 1: Identifying Cruise Control Components (A4)

Courtesy of AUDI OF AMERICA, INC.