| 1 | CHECK FOR PRESENCE OF AIR | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check for the presence of air in the system | Move on to Step 2 | Presence of air in the system | Bleed the air from the system    Op. 0010T65  HYDRAULIC BRAKE SYSTEM - BLEED AIR | 
| 2 | BRAKE SERVO CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check that the brake servo is working properly    See Test 3330DA CHECK VACUUM PUMP OPERATION AND BRAKE SERVO VACUUM CIRCUIT | Move on to Step 3 | Brake servo not working properly | Replace the brake servo assemblyOp. 3330D10 | 
| 3 | FLEXIBLE PIPES CHECK | ALL OK | PROBLEMS ENCOUNTERED | ACTION | 
|---|
|  | Check the condition of the flexible pipes. | End of diagnosis | Flexible pipes swollen or deteriorated. | Replace the flexible pipes involvedOp. 3330E  HYDRAULIC BRAKE SYSTEM PIPES |