16 · Diagnostics

F01 Poor braking action

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Brakes › F01 Poor braking action

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Fault diagnosisF01 Poor braking action

F01 Poor braking action

As the pressure exerted on the brake pedal increases, the braking action does not correspond.

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Preliminarily, check the type, condition and inflation pressure of the tyres	OK	Move onto step 1
		Pressure not correct	Restore the tyre inflation pressures End of diagnosis
		Tyres not suitable or worn	Replace the tyres End of diagnosis
1	CHECKING FOR BRAKE FLUID LEAKS Visually inspect: brake fluid level in the reservoir for fluid leaks from the brake pump, lines or system connections	OK	Move onto step 2
1		Leaks in system	Tighten the connectors or replace the damaged parts (see Assembly 3340B) End of diagnosis
2	CHECK WITH DIAGNOSTIC EQUIPMENT Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check: there are no faults in the ABS control unit	OK	Move onto step 3
		An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment End of diagnosis
		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 (Wiring diagram E7020 ABS ). End of diagnosis
3	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of: pump motor solenoids	OK	Move onto step 4
3		Fault detected in the pump or a solenoid	Replace electrohydraulic unit-electronic control unit Op. 3340A10 End of diagnosis
4	CHECK PAD TYPE AND SURFACE Check: condition of pad friction surfaces pad type	OK	Move onto step 5
		Friction surfaces vitrified or with traces of grease, oil or water	Clean, check and eliminate the causes of the fault End of diagnosis
		Front brake pads damaged or wrong type	Replace pads Op. 3310A60 End of diagnosis
		Rear pads damaged or wrong type	Replace pads Op. 3310B60 End of diagnosis
5	CHECK DISCS Check condition of brake discs	OK	Move onto step 6
		Front discs worn or damaged	Skim or if necessary replace the discs Op. 3310A48 End of diagnosis
		Rear discs worn or damaged	Skim or if necessary replace the discs Op. 3310B48 End of diagnosis
6	CHECK BRAKE CALIPERS Check the condition of the brake caliper pistons	OK	Move onto step 7
		Front caliper pistons worn or seized	Replace brake calipers Op. 3310A30 End of diagnosis
		Rear caliper pistons worn or seized	Replace brake calipers Op. 3310B36 End of diagnosis
7	CHECK BRAKE SERVO Check that brake servo is working properly:	OK	Move onto step 8
7		Brake servo not working properly	Replace the brake servo assembly Op. 3330D10 End of diagnosis
8	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
8		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev E10 Clutch pedal stiff (1.6 TS/1.8 TS/2.0 TS)Next › F02 Rear wheels lock when braking

Parts & tools for this job For 1997 Alfa Romeo 156

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