323001746 - 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 outMove on to Step 1The two warning lights both remain on after startingProceed as instructed    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 unitMove on to Step 21. Error detected in the control unit2. No communication with the control unit1. 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 3Fault detected in one of the solenoid valvesReplace the ABS electronic control unit - electrohydraulic unit    Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.
3REAR BRAKE CALLIPER CHECKAll OKProblems encounteredOperation
Check the condition of the rear brake calliper control pistonsMove on to Step 4Pistons worn or seizedReplace the rear brake callipers    Op. 3310B36 REAR BRAKE CALIPER (ONE), LEFT OR RIGHT - R.R
4BRAKE HOSES AND BLEEDING CHECKAll OKProblems encounteredOperation
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 screwsMove on to Step 5Bends or constrictions present, the fluid does not come out evenlyReplace the section of pipe affected by the problem.    Op. 3340B ABS SYSTEM PIPES
5FRONT BRAKE STATUS CHECKAll OKProblems encounteredOperation
Visually inspect that there is no grease, oil or dirt on the front braking surfacesEnd of diagnosisBraking surfaces dirtyClean again, check and eliminate the causes of the problem: if necessary, replace the front pads    Op. 3310A60 FRONT BRAKE PADS - REPLACE