Workshop Manuals Factory service & repair

Lancia Thesis Factory Service Manual (2002-2009)22 · Fault diagnosis

22 · Diagnostics

Excessive brake pedal travel

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: Brakes › Excessive brake pedal travel

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Fault diagnosisExcessive brake pedal travel

EXCESSIVE BRAKE PEDAL TRAVEL

When the brake pedal is pressed the travel is greater than normal

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	BRAKE PEDAL FLEXIBILITY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the brake pedal is not fleixble. Check that the brake fluid level is correct Check that there are no fluid leaks from: connectors, pipes, flexible pipes, reservoir, wheel cylinders, master cylinder Check that the flexible pipes do not expand as a result of the braking action Check that there are no obstructions in the brake fluid reservoir opening.	Move on to Step	1. Pedal flexible	1. Bleed the air See in Op. 3330A14 Hydraulic braking system - Bleed air
			2. No fluid in the reservoir due to leaks	2. Tighten the connectors or replace the component producing the leak, then top up the level See in Op. 3330A10 Brake fluid - Check level and top up, if necessary
			3. No fluid, but no visible leak	Move on to Step
			4. Front flexible pipes expanding	4. Replace the flexible pipes
			5. Opening obstructed	5. Clean the opening.
2	BRAKE PEDAL CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that there are not two pressure stages for the brake pedal and that it returns promptly	Move on to Step	1. The pedal catches: one pressure chamber is faulty	1. Replace the brake pump See in Op. 3330C14 MASTER CYLINDER (PUMP) - R.R. for versions with A.B.S.
		Move on to Step	2. The pedal returns with a delay: master cylinder faulty	2. Replace the brake pump See in Op. 3330C14 MASTER CYLINDER (PUMP) - R.R. for versions with A.B.S.
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector check the following at the Parking Brake Node (N.P.B.):in error environment that there are no faults in active diagnosis ambient the efficiency of the parking brake electric actuator by activating the brake switching on and off functions	Move on to Step	Presence of errors / actuator faulty	Continue following the instructions in the diagnostic table
4	BRAKE PEDAL FLEXIBILITY CHECK THROUGH ROAD TEST	ALL OK	PROBLEMS ENCOUNTERED	ACTION
2.4 20 V,2.0 TB,2.4 JTD 10V	Check that the brake pedal does not become too flexible after a great deal of braking with an increase in its travel (vapour lock)	Move on to Step	The pedal becomes flexible	Change the brake/clutch fluid See in Op. 0010T62 BRAKE and/or CLUTCH FLUID Replace fluid including washing pipes and bleeding air - R.R.
4	BRAKE PEDAL FLEXIBILITY CHECK THROUGH ROAD TEST	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the brake pedal does not become too flexible after a great deal of braking with an increase in its travel (vapour lock)	Move on to Step	The pedal becomes flexible	Change the brake fluid See in Op. 0010T62 BRAKE and/or CLUTCH FLUID Replace fluid including washing pipes and bleeding air - R.R.
5	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Test the vehicle before returning it to the customer, checking that the problem no longer exists. The test is essential because the braking system is one of the vehicle's safety systems.

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Parts & tools for this job For 2002 Lancia Thesis

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