Principle Of Operation
For a detailed description of the power brake actuation system, refer to the relevant Description and Operation section in the service information.
Refer to: Brake Booster (Description and Operation).
CAUTION:
Diagnosis by substitution from a donor vehicle is NOT
acceptable. Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle
For additional information.
Refer to: Brake System (General Information, Diagnosis and Testing).