In this tip from the ASE-T4 Test Prep course, instructor Jim Wilson several possible causes for pneumatic imbalance in diesel air braking systems.
This video will become your check list when dealing with pneumatic imbalance issues.
ASE-T4 Medium/Heavy Duty BrakesView Course
The ASE Test Prep class covers in detail the Extensive Air Brake System, Hydraulic System, Drum Brake, Disc Brake, Parking Brake, Power Assist Unit, Anti-Lock Brake/Automatic Traction Control Systems, and Wheel Bearings diagnostic information, including symptom descriptions and their causes. Also Included in this edition of the ASE T4 Brakes training are details on Air Brakes Diagnosis And Repair; Hydraulic Brakes Diagnosis And Repair; Air And Hydraulic Antilock Brake Systems (ABS) And Automatic Traction Control (ATC), Electronic Stability Control Systems; and Wheel Bearing Diagnosis And Repair.