Poor braking action
- Make
- Fiat
- Model
- Doblò Factory Service Manual
- Year
- 2000–2010
- Section
- Braking system › Poor braking action
Fault diagnosisPoor braking action
POOR BRAKING ACTION
| Results of the tests | ||||
| 0 | All OK | Problems met | Operation | |
|---|---|---|---|---|
Check softness of brake pedal Check stiffness of brake pedal | Continue to Step 1 | Brake pedal too soft | See table F10 EXCESSIVE BRAKE PEDAL FREE PLAY | |
| Hardening of brake pedal | See table F12 BRAKE PEDAL HARD | |||
| 1 | CHECK ON CONTACT SURFACES | All OK | Problems met | Operation |
| Check type and surfaces of contact | Continue to Step 2 | Pads vitrified | Replace the pads concerned Op. 3310A50 | |
| Dirty surfaces | Clean the surfaces in question | |||
| Small disc contact surface | Grind the discs, or replace, if necessary Op. 3310A50 | |||
| 2 | CHECK ON WHEEL CYLINDERS | All OK | Problems met | Operation |
| Check that the front caliper pistons have not seized | Continue to Step 3 | Wheel cylinders seized | Replace the pistons Op. 3310A38 | |
| 3 | CHECK ON PUSHROD | All OK | Problems met | Operation |
| Check the play on the brake servo pushrod controlling the master cylinder | Continue to Step 4 | Excessive pushrod play | Adjust the play | |
| 4 | CHECK ON BRAKING ACTION | All OK | Problems met | Operation |
| Check that the braking effect does not decrease even after several braking actions | Continue to Step 6 | The braking effect decreases significantly | Replace the brake fluid with a type of higher viscosity and boiling point Op. 0010T62 | |
| 1.9 DIESEL | Check that the braking effect does not decrease even after several braking actions | Continue to Step 5 | The braking effect decreases significantly | Replace the brake fluid with a type of higher viscosity and boiling point Op. 0010T63 |
| 5 | CHECKING WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| 1.9 DIESEL | Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the ABS control unit | Continue to Step 6 | 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 | |||
| 6 | CHECKING 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' | ||
Parts & tools for this job For 2000 Fiat Doblò
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLSocket setSearch: socket set metric
- BOOKHaynes manualSearch: Haynes manual Fiat Doblò
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