| | 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 | | 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 NON-RETURN VALVE | All OK | Problems met | Operation |
|---|
| Check
that the non-return valve is working properly | Continue to Step 3 | Faulty operation | Replace check valve Op. 3330D20 |
| 3 | CHECK ON SERVO BRAKE HYDRAULIC
CIRCUIT | All
OK | Problems
met | Operation |
|---|
| Check
the brake servo pneumatic circuit 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 pump/ servo
brake assembly Op. 3330D02 |
| Brake servo operation is jerky | Replace the pump/ servo brake assembly Op. 3330D02 |
| 4 | CHECK ON VACUUM | All OK | Problems met | Operation |
|---|
| 1.2 8v | 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 servo unit. |
| Continue to Step 5 | Value incorrect | Eliminate blockages in the
manifold |
| Value correct | Replace the pump/ servo brake assembly Op. 3330D02 If
pedal stiffness persistsContinue to Step 5 |
| 1.9 DIESEL | 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 servo unit. |
| Continue to Step 5 | Value incorrect | Replace the vacuum unit Op. 3330D30 |
| Value correct | Replace the pump/ servo brake assembly Op. 3330D02 .
If pedal stiffness persistsContinue to Step 5 |
| 5 | CHECK ON WHEEL CYLINDERS AND BRAKE
PUMP | All
OK | Problems
met | Operation |
|---|
| Check
that the wheel cylinders and brake pump are not seizedCheck that one or more wheels do not remain braked | Continue to Step 6 | Seizure of the pump | Replace the pump/ servo
brake assembly |
| Seizure of a caliper | Replace the seized caliper Op. 3310A30 |
| Seizure of a wheel cylinder | Replace the seized cylinder Op. 3320B20 |
| The car remains braked | Remove the servo/pump assembly and adjust the projection
of the pushrod |
| The car remains braked at the rear | Repair the handbrake |
| 6 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
|---|
| 1.9 DIESEL | Connect diagnostic equipment (Examiner or other instruments)
to the diagnostic socket. Verify: - that there are no faults in the ABS control unit
- that the ABS and EBD warning lights are working
| Continue to Step 7 | An error is detected in
the control unit | Continue following the instructions for the diagnostic
equipment |
| Lack of dialogue with the control unit | Restore the connection between the engine management
control unit and the diagnostic connector See E7020 ABS |
| 7 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
|---|
| Test
the vehicle before delivery to the customer, to check that the fault
is no longer present | The test is essential, as the braking system involves a safety
feature of the car |
| | Fault persists | Search for the
fault starting from another symptom' |