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

Rear wheels lock whilst braking

Make
Fiat
Model
Grande Punto Factory Service Manual
Year
2005–2012
Section
Brakes › Rear wheels lock whilst braking
Fault diagnosisRear wheels lock whilst braking

REAR WHEELS LOCK WHILST BRAKING

When the brakes are operated the distribution between the front and rear wheels is not correct: in extreme conditions the rear wheels lock and the vehicle may skid

Results of the tests
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

For the 1.9 JTD;

First of all check whether the ABS warning light and the handbrake warning light come on simultaneously during starting and then go out

Move on to Step 1The two warning lights both remain on after starting

Proceed as instructed

See table K062 ABS AND HANDBRAKE WARNING LIGHTS BOTH ON

1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation

For the 1.9 JTD;

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

For the 1.9 JTD;

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

- pump motor;

- solenoid valves.

Move on to Step 3Fault detected in one of the solenoid valves

Replace the ABS electronic control unit - electrohydraulic unit

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

3REAR BRAKE CALIPER CHECKAll OKProblems encounteredOperation

For the 1.9 JTD;

Check the condition of the rear brake caliper pistons

Move on to Step 4Pistons worn or seized

Replace the rear brake calipers

Op. 3310B36 REAR BRAKE CALIPER (ONE), LEFT OR RIGHT - R.R

4CHECK ON FLEXIBLE BRAKE PIPES AND BLEEDINGAll OKProblems encounteredOperation

For the 1.9 JTD;

Visually inspect that there are no bends or constrictions in the brake pipes, bleed the system and check that the fluid comes out evenly from the bleed screws.

Move on to Step 5Bends or constrictions present, the fluid does not come out evenly

Replace the section of pipe affected by the problem

Op. 3340B ABS SYSTEM PIPES

5FRONT BRAKE STATE CHECKAll OKProblems encounteredOperation

For the 1.9 JTD;

Visually inspect that there is no grease, oil or dirt on the front braking surfaces

End of diagnosisBraking surfaces dirty

Clean, check and eliminate the causes of the problem: if necessary, replace the front pads

Op. 3310A60 FRONT BRAKE PADS - REPLACE

Parts & tools for this job For 2005 Fiat Grande Punto

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