312000214 - F002 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
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 21. Error detected in the control unit.2. No communication with the control unit.1. Continue following the instructions on the diagnostic equipment2. 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 versionMove on to Step 4 for the 1.2 8v and 1.3 Mjet 16v versionsFault 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 callipersOp. 3310B34
4REAR BRAKE CHECKAll OKProblems encounteredOperation
Check the condition of the rear brake shoes.Move on to Step 5Rear brake shoes wornReplace the rear brake shoesOp. 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