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Fiat Grande Punto Factory Service Manual (2005-2012)22 · Fault diagnosis
22 · Diagnostics

Brake pedal hard

Make
Fiat
Model
Grande Punto Factory Service Manual
Year
2005–2012
Section
Brakes › Brake pedal hard
Fault diagnosisBrake pedal hard

BRAKE PEDAL HARD

When the brake pedal is pressed there is a hardening in the pedal travel

Results of the tests
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Connect the Examiner diagnostic equipment to the diagnostic socket.

Check that there are no faults in the ABS control unit

Move on to Step 2

1. Error detected in the control unit

2. No communication with the control unit

1. Continue following the instructions for the diagnostic equipment

2. Restore:

- Connection between the ABS control unit and the diagnostic connector - ABS control unit supply

See E7020 ABS

2ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

Keeping the Examiner diagnostic equipment connected carry out the active diagnosis of:

- pump motor;

- solenoid valves.

Move on to Step 3Fault detected in the pump or in a solenoid valve

Replace the ABS electronic control unit electrohydraulic unit

Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.

3VACUUM PIPE CHECKAll OKProblems encounteredOperation
Check that the vacuum pipe is correctly fitted/in good conditionMove on to Step 4

1. Pipe not fitted correctly or bent

2. Pipe damaged

1. Refit correctly

2. Replace vacuum pipe

Op. 3330D26 VACUUM PIPE FOR BRAKE SERVO ASSEMBLY - R.R

4BRAKE SERVO SINGLE-ACTING VALVE CHECKAll OKProblems encounteredOperation
Check that the brake servo single-acting valve is working properlyMove on to Step 5Single-acting valve not working properly

Clean the one-way valve if it is fouled or dirty, or else replace it

Op. 3330D20 SINGLE-ACTING VALVE FOR BRAKE SERVO - R+R

5BRAKE SERVO VACUUM CHECKAll OKProblems encounteredOperation

Check the condition of the brake servo vacuum unit.

Check the condition of the vacuum pipe and the connectors and bands

Move on to Step 6

1. Brake servo vacuum unit faulty

2. Pipe damaged

1. Replace the brake servo vacuum unit

Op. 3330D30 VACUUM PUMP - R+R

2. Renew the fastenings or replace the vacuum pipe

6BRAKE SERVO CHECKAll OKProblems encounteredOperation

Check that the brake servo is working properly

See Test 3330DA CHECK VACUUM PUMP OPERATION AND BRAKE SERVO VACUUM CIRCUIT

End of diagnosisBrake servo not working properly

Replace brake servo

Op. 3330D02 BRAKE SERVO/BRAKE PUMP ASSEMBLY - R.R.

Parts & tools for this job For 2005 Fiat Grande Punto

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