Excessive brake pedal free play
- Make
- Fiat
- Model
- Doblò Factory Service Manual
- Year
- 2000–2010
- Section
- Braking system › Excessive brake pedal free play
Fault diagnosisExcessive brake pedal free play
EXCESSIVE BRAKE PEDAL FREE PLAY
| Results of the tests | ||||
| 1 | BRAKE PEDAL SOFTNESS CHECK | All OK | Problems met | Operation |
|---|---|---|---|---|
Check that the brake pedal is not soft Check the brake fluid level warning light Check that there are no fluid leaks from: connectors, pipes, hoses, brake adjuster, reservoir, wheel cylinders, master cylinder | Continue to Step 2 | Pedal soft | Bleed the air Op. 0010A65 | |
| Fluid missing from reservoir because of leak | Tighten the connectors or replace the part generating the leak, then top up to the medium level Op. 0010A64 | |||
| Fluid missing, but leak not visible | Remove the brake servo one-way valve (see Op. 3330D20) and check for leaks using a tube brush. Replace the brake servo/pump assembly Top up to medium level | |||
| 1.9 DIESEL | Check that the brake pedal is not soft Check the brake fluid level warning light Check that there are no fluid leaks from: connectors, pipes, hoses, brake adjuster, reservoir, wheel cylinders, master cylinder | Continue to Step 2 | Pedal soft | Bleed the air Op. 0010A66 |
| Fluid missing from reservoir because of leak | Tighten the connectors or replace the part generating the leak, then top up to the medium level Op. 0010A64 | |||
| Fluid missing, but leak not visible | Remove the brake servo one-way valve (see Op. 3330D20) and check for leaks using a tube brush Replace the brake servo/pump assembly Top up to medium level | |||
| 2 | CHECK BRAKE PEDAL | All OK | Problems met | Operation |
| Check that the brake pedal does not have two pressure stages and that it returns promptly | Continue to Step 3 | The pedal jumps: one chamber is not holding pressure | Replace the brake servo/pump assembly Op. 3330D02 | |
| The pedal returns after a delay: master cylinder fault. | Replace the brake servo/pump assembly Op. 3330D02 | |||
| The pedal returns after a delay: front cylinder/caliper fault. | Replace the front caliper Op. 3310A30 | |||
| 3 | CHECK ON EFFICIENCY OF HANDBRAKE SELF-ADJUSTER | All OK | Problems met | Operation |
| Check the efficiency of the handbrake self-adjuster, by pulling the handbrake | Continue to Step 4 | Device faulty | Change the device | |
| 4 | BRAKE PEDAL SOFTNESS CHECK | All OK | Problems met | Operation |
| Check whether the pedal becomes too soft after several braking actions (Vapour loop) | Continue to Step 5 | The pedal becomes soft | Replace the brake fluid with one of a higher specification Op. 0010T62 | |
| 1.9 DIESEL | Check whether the pedal becomes too soft after several braking actions (Vapour loop) | Continue to Step 5 | The pedal becomes soft | Replace the brake fluid with one of a higher specification Op. 0010T62 |
| 5 | CHECK ON HOLE ON BRAKE FLUID RESERVOIR | All OK | Problems met | Operation |
| Check that the hole in the brake fluid reservoir is not blocked | Continue to Step 6 | Hole blocked | Clean reservoir hole | |
| 6 | 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' | ||
Parts & tools for this job Staging For 2000 Fiat Doblò
- PARTBrake padsSearch: Fiat Doblò 2000 brake pads
- TOOLBrake bleeder kitSearch: one man brake bleeder kit
- FLUIDBrake fluidSearch: brake fluid
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