F01 POOR BRAKING ACTION - Alfa - 166 - eLearn

3308625 - F01 POOR BRAKING ACTION

As the pressure on the brake pedal increases, a corresponding braking action is not detected (without increasing the pedal travel).

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Verify: that there are no faults in the ABS control unit the plausibility of all the parameters	Continue to Step 2	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 2	Lack of dialogue with the control unit	Restore the connection between the ABS control unit and diagnostic connector ( See E7020 ABS )
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other iinstruments) carry out the active diagnosis of: pump motor solenoid valves	Continue to Step 3	Pump and/or solenoids faulty	Replace electrohydraulic unit-electronic control unit Op. 3340A12
3	CHECK PAD TYPE AND SURFACE	All OK	Problems met	Operation
	Verify: condition of pad friction surfaces pad type	Continue to Step 4	Friction surfaces vitrified or with traces of oil or grease	Clean and eliminate the causes of the problem
			Front pads damaged or wrong type	Replace front pads Op. 3310A60
			Rear pads damaged or wrong type	Replace rear pads Op. 3310B60
4	CHECK DISCS	All OK	Problems met	Operation
	Check the condition of the brake discs	Continue to Step 5	Front discs worn or damaged	Skim or if necessary replace front discs Op. 3310A48
	Check the condition of the brake discs	Continue to Step 5	Rear discs worn or damaged	Skim or if necessary replace rear discs Op. 3310B48
5	CHECKING BRAKE CALIPERS	All OK	Problems met	Operation
	Check that the brake caliper pistons run freely	Continue to Step 6	Front caliper pistons seized	Replace front brake calipers Op. 3310A30
	Check that the brake caliper pistons run freely	Continue to Step 6	Rear caliper pistons seized	Replace rear brake calipers Op. 3310B36
6	CHECK VACUUM PIPE	All OK	Problems met	Operation
	Check condition and fitting of vacuum pipe	Continue to Step 7	Pipe fitted incorrectly or bent	Refit correctly
	Check condition and fitting of vacuum pipe	Continue to Step 7	Pipe damaged	Replace the vacuum pipe Op. 3330D24
7	CHECK NON-RETURN VALVE	All OK	Problems met	Operation
	Check that the non-return valve is working properly	Continue to Step 8	Non-return valve not working properly	Replace non-return valve Op. 3330D20
8	CHECK BRAKE SERVO	All OK	Problems met	Operation
	Check that brake servo is working properly: See Test 3330DA Check operation of brake servo	Continue to Step 9	Brake servo not working properly	Replace the servo unit Op. 3330D10
9	CHECK ENGINE VACUUM	All OK	Problems met	Operation
	Check vacuum in vacuum circuit: See Test 3330DA Check operation of brake servo	Continue to Step 10	Vacuum value incorrect	Replace brake servo vacuum unit Op. 3310A30
10	CHECK BRAKE PIPES/HOSES AND BLEEDING	All OK	Problems met	Operation
	Visually check that there are no kinks or restrictions in the brake pipes, bleed the system and check that fluid emerges from the bleed screws as normal	Continue to Step 11	There are kinks or restrictions, fluid does not come out normally	Replace the faulty section of pipe
11	HECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'