Workshop Manuals Factory service & repair Fiat
Fiat 500 Factory Service Manual (2007-2024)22 · Fault diagnosis
22 · Diagnostics

Rear wheels lock whilst braking

Make
Fiat
Model
500 Factory Service Manual
Year
2007–2024
Section
Brakes › Rear wheels lock whilst braking
Fault diagnosisRear wheels lock whilst braking

REAR WHEELS LOCK WHILST BRAKING

1.2 8v, 1.3 Multijet, 1.4 16v

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

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation
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 in the

See table K062 ABS AND HANDBRAKE WARNING LIGHTS BOTH ON

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 on 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 3 for 1.4 16v version

Move on to Step 4 for the 1.2 8v and 1.3 Mjet 16v versions

Fault detected in one of the solenoid valves.

Replace the electrohydraulic unit - ABS electronic control unit

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

3REAR BRAKE CALIPER CHECKAll OKProblems encounteredOperation
Check the condition of the rear brake caliper pistons.Move on to Step 6Pistons worn or seized.

Replace the rear brake callipers

Op. 3310B34

4REAR BRAKE CHECKAll OKProblems encounteredOperation
Check the condition of the rear brake shoes.Move on to Step 5Rear brake shoes worn

Replace the rear brake shoes

Op. 3320B10 REAR DRUM BRAKES - R.R.

5CHECK THE SELF-ADJUSTING PLAY TAKE-UP DEVICE BETWEEN THE SHOES AND THE DRUMAll OKProblems encounteredOperation
Check efficiency of the self-adjusting play take-up device between the shoes and drum.Move on to Step 6Fault in the play take-up device.Replace the micrometric recovery device.
6FAM ADJUSTMENT CHECKAll OKProblems encounteredOperation
Check whether the device is preloaded with the handbrake in the rest position.Move on to Step 7The device is preloaded with the handbrake in the rest position.Restore the correct handbrake adjustment.
7FLEXIBLE BRAKE PIPES AND BLEEDING CHECKAll OKProblems encounteredOperation

Visually check for kinks or restrictions in the brake pipes. Bleed the system

Op. 0010T65 HYDRAULIC BRAKE SYSTEM - BLEED AIR

and check that fluid emerges evenly from the bleed screws.

Move on to Step 8Bends or constrictions present, the fluid does not come out evenly.Replace the section of pipe affected by the problem.
8FRONT BRAKE STATE CHECKAll OKProblems encounteredOperation
Visually inspect that there is no grease, oil or dirt on the front braking surfaces.End of diagnosisBraking surfaces dirty.

Clean again, check and remove the causes of the fault: if necessary, replace the front pads

Op. 3310A60 FRONT BRAKE PADS - REPLACE

Parts & tools for this job For 2007 Fiat 500

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.