2888351 - F01 POOR BRAKING ACTION
As the pressure exerted on the brake pedal increases, the braking action does not correspond.| Results of the tests | ||||
| 1 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
|---|---|---|---|---|
| Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCheck that there are no faults in the ABS control unit. | Continue to Step 2 | An error is detected in the control unit | Continue according to the instructions for the diagnostic equipment | |
| Lack of dialogue with the control unit | Restore:
| |||
| 2 | ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of:
| Continue to Step 3 | Fault detected in one solenoid | Replace electrohydraulic unit-electronic control unit Op. 3340A12 | |
| 3 | CHECK FRICTION SURFACES | All OK | Problems met | Operation |
Check:
| Continue to Step 4 | Friction surfaces vitrified or with traces of grease, oil or water | Clean, check and eliminate the causes of the fault | |
| Front brake pads damaged or wrong type | Replace pads Op. 3310A60 | |||
| Rear shoes damaged or wrong type | Replace the shoes Op. 3320B10 | |||
| 4 | CHECK FRONT DISCS AND CALIPERS | All OK | Problems met | Operation |
| Check condition of front brake discsCheck the condition of the brake caliper pistons | Continue to Step 5 | Front discs worn or damaged | Grind the discs Op. 3310A54 , or replace if necessary | |
| Front caliper pistons worn or seized | Replace brake calipers Op. 3310A30 | |||
| 5 | CHECK REAR DRUMS | All OK | Problems met | Operation |
| Check the condtion of the rear brake drums.Check the condition of the rear brake cylinders. | Continue to Step 6 | Rear drums worn or damaged | Replace the drums Op. 3320B30 | |
| Shoe control cylinders worn or seized | Replace the cylinders Op. 3320B20 | |||
| 6 | CHECK VACUUM PIPE | All OK | Problems met | Operation |
| Check condition and fitting of vacuum pipe | Continue to Step 7 | Pipe fitted incorrectly or bent | Refit correctly | |
| Pipe damaged | Replace the vacuum pipe Op. 3330D24 | |||
| 7 | CHECK NON-RETURN VALVE | All OK | Problems met | Operation |
| Check that the non-return valve is working properly | Continue to Step 8 | Non-return valve not working properly | Replace non-return valve Op. 3330D20 | |
| 8 | CHECK BRAKE SERVO | All OK | Problems met | Operation |
| Check that brake servo is working properly: See Test 3330DA Check operation of brake servo | Continue to Step 9 | Brake servo not working properly | Replace the servo unit Op. 3330D10 | |
| 9 | CHECK ENGINE VACUUM | All OK | Problems met | Operation |
| 1.9 JTD 8V ABS | Check vacuum in vacuum circuit: | Continue to Step 10 | Vacuum value incorrect | Replace brake servo vacuum unit Op. 3330D30 |
| 1.6 16v ABS | Continue to Step 10 | |||
| 10 | CHECK BRAKE PIPES/HOSES AND BLEEDING | All OK | Problems met | Operation |
| Visually check that there are no kinks or restrictions in the brake pipes, bleed the system Op. 3330A18 and check that fluid emerges from the bleed screws as normal | Continue to Step 11 | There are kinks or restrictions, fluid does not come out normally | Replace the section of pipe affected by the fault (see Assembly 3340B) | |
| 11 | CHECKING CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Search for the fault starting from another symptom' | |
| Results of the tests | ||||
| 1 | CHECK FRICTION SURFACES | All OK | Problems met | Operation |
|---|---|---|---|---|
Check:
| Continue to Step 2 | Friction surfaces vitrified or with traces of grease, oil or water | Clean, check and eliminate the causes of the fault | |
| Front brake pads damaged or wrong type | Replace pads Op. 3310A60 | |||
| Rear shoes damaged or wrong type | Replace the shoes Op. 3320B10 | |||
| 2 | CHECK FRONT DISCS AND CALIPERS | All OK | Problems met | Operation |
| Check condition of front brake discsCheck the condition of the brake caliper pistons | Continue to Step 3 | Front discs worn or damaged | Grind the discs Op. 3310A54 , or replace if necessary | |
| Front caliper pistons worn or seized | Replace brake calipers Op. 3310A30 | |||
| 3 | CHECK REAR DRUMS | All OK | Problems met | Operation |
| Check the condtion of the rear brake drums.Check the condition of the rear brake cylinders. | Continue to Step 4 | Rear drums worn or damaged | Replace the drums Op. 3320B30 | |
| Shoe control cylinders worn or seized | Replace the cylinders Op. 3320B20 | |||
| 4 | CHECK VACUUM PIPE | All OK | Problems met | Operation |
| Check condition and fitting of vacuum pipe | Continue to Step 5 | Pipe fitted incorrectly or bent | Refit correctly | |
| Pipe damaged | Replace the vacuum pipe Op. 3330D24 | |||
| 5 | CHECK NON-RETURN VALVE | All OK | Problems met | Operation |
| Check that the non-return valve is working properly | Continue to Step 6 | Non-return valve not working properly | Replace non-return valve Op. 3330D20 | |
| 6 | CHECK BRAKE SERVO | All OK | Problems met | Operation |
| Check that brake servo is working properly: See Test 3330DA Check operation of brake servo | Continue to Step 7 | Brake servo not working properly | Replace the servo unit Op. 3330D10 | |
| 7 | CHECK ENGINE VACUUM | All OK | Problems met | Operation |
| 1.9 JTD 8V [[] | Check vacuum in vacuum circuit: | Continue to Step 8 | Vacuum value incorrect | Replace brake servo vacuum unit Op. 3330D30 |
| 1.6 16v [[] | Continue to Step 8 | |||
| 8 | CHECK BRAKE PIPES/HOSES AND BLEEDING | All OK | Problems met | Operation |
| Visually check that there are no kinks or restrictions in the brake pipes, bleed the system Op. 3330A18 and check that fluid emerges from the bleed screws as normal | Continue to Step 9 | There are kinks or restrictions, fluid does not come out normally | Replace the section of pipe which is faulty (see Assembly 3330E) | |
| 9 | CHECKING CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Search for the fault starting from another symptom' | |