22 · Diagnostics

Poor braking action

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: Brakes › Poor braking action

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Fault diagnosisPoor braking action

POOR BRAKING ACTION

As the pressure exerted on the brake pedal increases, there is no noticeable corresponding braking action

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the flexibility of the brake pedal Check the hardening of the brake pedal	Move on to Step	1. Brake pedal too flexible	1. Continue following the instructions in Table F010 Continue following the instructions in the table F10 EXCESSIVE BRAKE PEDAL TRAVEL
		Move on to Step	2. Brake pedal hardening	2. Continue following the instructions in Table F012 Continue following the instructions in the table F12 BRAKE PEDAL HARDENING
1	CONTACT SURFACE CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the front and rear contact surfaces are not damaged	Move on to Step	1. Front pads or discs vitrified	1. Replace the pads < R1 > or restore the disc surfaces See in Op. 3310A60 FRONT BRAKE PADS - Replace
			2. Rear pads or discs vitrified	2. Replace the pads < R1 > or restore the disc surfaces See in Op. 3310B60 REAR BRAKE PADS - Replace - Including handbrake adjustment if necessary
			3. Surfaces dirty	3. Clean the surfaces affected
			4. Front disc contact surface deteriorated	4. Regrind the discs or, if necessary, replace them See in Op. 3310A48 FRONT BRAKE DISC (one), left or right - R.R.
			5. Rear disc contact surface deteriorated	5. Regrind the discs or, if necessary, replace them See in Op. 3310B48 REAR BRAKE DISC (one), left or right - R.R.
2	BRAKE CALIPER PISTON CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that there is no seizing of the brake caliper pistons	Move on to Step	1. Front pistons seized	1. Replace the front calipers See in Op. 3310A30 FRONT BRAKE CALIPER (one) - R.R. - Includes bleeding air
	Check that there is no seizing of the brake caliper pistons	Move on to Step	2. Rear pistons seized	2. Replace the rear calipers See in Op. 3310B36 REAR BRAKE CALIPER (one), left or right - R.R.
3	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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