3233032 - F01 POOR BRAKING ACTION

As the pressure exerted on the brake pedal increases, the braking action does not correspond.
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Preliminarily, check the type, condition and inflation pressure of the tyres Continue to Step 1 Pressure not correctRestore the tyre inflation pressures
Tyres not suitable or wornReplace the tyres
1CHECKING FOR BRAKE FLUID LEAKSAll OKProblems metOperation

Visually inspect:

  • brake fluid level in the reservoir
  • for fluid leaks from the brake pump, lines or system connections
 Continue to Step 2 Leaks in systemTighten the connectors or replace the damaged parts (see Assembly 3340B)
2CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket

Check:

  • there are no faults in the ABS control unit
 Continue to Step 3 An error is detected in the control unitContinue according to the instructions for the diagnostic equipment
Lack of dialogue with the control unit

Restore:

  • the connection between the ABS control unit and the diagnostic connector
  • the supply for the ABS control unit ( See   E7020  ABS ).
3ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of:

  • pump motor
  • solenoids
 Continue to Step 4 Fault detected in the pump or a solenoid Replace electrohydraulic unit-electronic control unit Op. 3340A10
4CHECK PAD TYPE AND SURFACEAll OKProblems metOperation

Check:

  • condition of pad friction surfaces
  • pad type
 Continue to Step 5 Friction surfaces vitrified or with traces of grease, oil or waterClean, check and eliminate the causes of the fault
Front brake pads damaged or wrong type Replace pads Op.   3310A60 
Rear pads damaged or wrong type Replace pads Op.   3310B60 
5CHECK DISCSAll OKProblems metOperation
Check condition of brake discs Continue to Step 6 Front discs worn or damaged Skim or if necessary replace the discs Op.   3310A48 
Rear discs worn or damaged Skim or if necessary replace the discs Op.   3310B48 
6CHECK BRAKE CALIPERSAll OKProblems metOperation
Check the condition of the brake caliper pistons Continue to Step 7 Front caliper pistons worn or seized Replace brake calipers Op.   3310A30 
Rear caliper pistons worn or seized Replace brake calipers Op.   3310B36 
7CHECK BRAKE SERVOAll OKProblems metOperation
Check that brake servo is working properly: Continue to Step 8 Brake servo not working properly Replace the brake servo assembly Op.   3330D10 
8CHECK CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisFault persistsSearch for the fault starting from another symptom'