| | Results of the tests |
| 0 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|
| Resting the foot on the brake pedal, check that the pedal sinks when the engine is started, because of the vacuum in the braking circuit | End of diagnosis | Absence of or partial servo assistance | Continue to Step 1 |
| 1 | CHECK ON VACUUM PIPE | All OK | Problems met | Operation |
|---|
| Check vacuum pipe: must not be bent or damaged | Continue to Step 2 | Pipe bent | Restore the correct geometry |
| Pipe damaged | Replace the damaged pipe Op. 3330D24 |
| 2 | CHECK ON NON-RETURN VALVE | All OK | Problems met | Operation |
|---|
| Check that the non-return valve is working properly | Continue to Step 3 | Faulty operation | Replace the check valve Op. 3330D20 |
| 3 | BRAKE SERVO PNEUMATIC CIRCUIT CHECK | All OK | Problems met | Operation |
|---|
| Check in particular: - that there are no air leaks
- that there are no seizures or stiffness
| Continue to Step 4 | Brake servo with leaks | Replace the brake servo/pump assembly Op. Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R R |
| Brake servo operation is jerky | Replace the brake servo/pump assembly Op. Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R R |
| 4 | CHECK ON VACUUM | All OK | Problems met | Operation |
|---|
| Check the vacuum level in the servo brake system | Under particular conditions of use, low engine rpm with excessive use of the brakes, the vacuum for operating the servo brake may be insufficient resulting in hardening of the brake pedal. It is pointless replacing the brakeservo. |
| Continue to Step 5 | Value incorrect | Eliminate blockages in the manifold |
| Value correct | Replace the brake servo/pump assembly Op. Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R R |
| 5 | CHECK ON PUMP | All OK | Problems met | Operation |
|---|
| Check that the brake pump has not seized.Check that one or more wheels do not remain braked | Continue to Step 6 | Seizure of the pump | Replace the brake servo/pump assembly Op. Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R R |
| Seizure of a front caliper | Replace the caliper Op. Op. 3310A30 FRONT BRAKE CALIPER ONE R R |
| Seizure of a rear caliper | Replace the caliper Op. Op. 3310B36 REAR BRAKE CALLIPER - R R |
| The car remains braked | Remove the servo/pump assembly Op. Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R Rand adjust the projection of the pushrod |
| The car remains braked at the rear | Repair the handbrake |
| 6 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Test the vehicle before delivery to the customer, checking that the fault is no longer present | The test is essential, as the braking system is a safety feature of the car |
| End of diagnosis | . | |