F12 BRAKE PEDAL HARD - Alfa - 156 - eLearn

3233036 - F12 BRAKE PEDAL HARD

When the brake pedal is pressed, stiffness is felt during the pedal travel.

1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check that there are no faults in the ABS control unit.	Continue to Step 2	An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment
		Continue to Step 2		Restore: the connection between the ABS control unit and the diagnostic connector the supply for the ABS control unit ( See E7020 ABS ).
2	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of: pump motor; solenoids	Continue to Step 3	Fault detected in the pump or a solenoid	Replace electrohydraulic unit-electronic control unit Op. 3340A12
3	CHECKING BRAKE SERVO CHECK VALVE	All OK	Problems met	Operation
	Check that there are no leaks through the brake servo check valve	Continue to Step 4	Check valve defective	Clean the check valve if it is clogged or dirty, or replace
4	BRAKE SERVO VACUUM CHECK	All OK	Problems met	Operation
1.6 TS 1.8 TS [d] 2.5 V6	Check the condition of the vacuum pipe and connectors and bands	Continue to Step 5	Fixings or components faulty.	Renew the fixings or replace the faulty components
1.6 TS 1.8 TS [d] 2.5 V6		Continue to Step 5	Pipe damaged	Replace the vacuum pipe
1.9 JTD 8v 2.4 JTD 10v	Check the condition of the brake servo vacuum valve See Test 3330DA Check operation of brake servo vacuum circuit and vacuum unit Check the condition of the vacuum pipe and connectors and bands	Continue to Step 5	Brake servo vacuum pump faulty	Replace the brake servo vacuum pump Op. 3330D30
1.9 JTD 8v 2.4 JTD 10v		Continue to Step 5	Pipe damaged	Repair fastenings or replace the vacuum pipe
5	CHECK BRAKE SERVO	All OK	Problems met	Operation
	Check that brake servo is working properly:	Continue to Step 6	Brake servo not working properly	Replace the servo unit Op. 3330D10
6	CHECK BRAKE CALIPERS	All OK	Problems met	Operation
	Check the condition of the brake caliper pistons	Continue to Step 7	Front caliper pistons worn or seized	Replace brake calipers Op. 3310A30
	Check the condition of the brake caliper pistons	Continue to Step 7	Rear caliper pistons worn or seized	Replace brake calipers Op. 3310B36
7	CHECKING 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'