22 · Diagnostics

Brake pedal hard

Make: Fiat
Model: Multipla Factory Service Manual
Year: 1998–2010
Section: Braking system › Brake pedal hard

‹ Prev Excessive brake pedal free play Next › Abs working irregularly

Fault diagnosisBrake pedal hard

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	Lack of dialogue with the control unit	Refit: the connection between the ABS control unit and the diagnostic connector the ABS control unit supply 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 soleonoids	Continue to Step 3	A fault is detected in the pump or in a solenoid valve	Replace electrohydraulic unit-electronic control unit Op. 3340A12
3	CHECK VACUUM PIPE	All OK	Problems met	Operation
	Check condition and fitting of vacuum pipe	Continue to Step 4	Pipe fitted incorrectly or bent	Refit correctly
	Check condition and fitting of vacuum pipe	Continue to Step 4	Pipe damaged	Replace the vacuum pipe Op. 3310D24
4	CHECK ON NON-RETURN VALVE	All OK	Problems met	Operation
	Check that the non-return valve is working properly	Continue to Step 5	Non-return valve not working properly	Replace non-return valve Op. 3330D20
5	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 6	Brake servo not working properly	Replace the servo unit Op. 3330D10
6	CHECK ENGINE VACUUM	All OK	Problems met	Operation
1.9 JTD 8V ABS	Check vacuum in vacuum circuit:	Continue to Step 7	Vacuum value incorrect	Replace brake servo vacuum unit Op. 3330D30
1.6 16v ABS		Continue to Step 7
7	CHECK 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'

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

1	CHECK VACUUM PIPE	All OK	Problems met	Operation
		Results of the tests
	Check condition and fitting of vacuum pipe	Continue to Step 2	Pipe fitted incorrectly or bent	Refit correctly
	Check condition and fitting of vacuum pipe	Continue to Step 2	Pipe damaged	Replace the vacuum pipe Op. 3310D24
2	CHECK ON NON-RETURN VALVE	All OK	Problems met	Operation
	Check that the non-return valve is working properly	Continue to Step 3	Non-return valve not working properly	Replace non-return valve Op. 3330D20
3	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 4	Brake servo not working properly	Replace the servo unit Op. 3330D10
4	CHECK ENGINE VACUUM	All OK	Problems met	Operation
1.9 JTD 8V [[]	Check vacuum in vacuum circuit:	Continue to Step 5	Vacuum value incorrect	Replace brake servo vacuum unit Op. 3330D30
1.6 16v [[]		Continue to Step 5
5	CHECK 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'

‹ Prev Excessive brake pedal free play Next › Abs working irregularly

Parts & tools for this job For 1998 Fiat Multipla

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