Workshop Manuals Factory service & repair

Alfa Romeo 147 Factory Service Manual (2000-2004)22 · Fault diagnosis

22 · Diagnostics

Drift whilst braking

Make: Alfa Romeo
Model: 147 Factory Service Manual
Year: 2000–2004
Section: STEERING – vehicle behaviour › Drift whilst braking

‹ Prev Vehicle drift Next › Steering hard / (steering in both directions)

Fault diagnosisDrift whilst braking

DRIFT WHILST BRAKING

During braking, the car pulls to the right and/or left

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check that the brake pedal is not too soft	Continue to Step 1	Brake pedal too soft	See table F10 EXCESSIVE BRAKE PEDAL FREE PLAY
1	CHECK FOR FLUID LEAKS	All OK	Problems met	Operation
	Check that there are no fluid leaks from: calipers master cylinder - condition of braking system	Continue to Step 2	Fluid leak from a front caliper	Replace the faulty caliper Op. 3310A30
		Continue to Step 2	Fluid leak from a rear caliper	Replace the faulty caliper Op. 3310B36
2	CHECK ON BRAKE WEAR	All OK	Problems met	Operation
	Check the state of wear of the brakes - condition of brake surfaces	Continue to Step 3	Brakes very worn	Overhaul the brakes
		Continue to Step 3	Discs vitrified or with traces of grease	Clean and check for causes
3	CHECK WHEEL GEOMETRY	All OK	Problems met	Operation
	Check the geometry and track of the wheel axle	Continue to Step 4	Front wheel geometry outside limits	Restore the correct front wheel geometry Op. 4450A10
	Check the geometry and track of the wheel axle	Continue to Step 4	Rear wheel geometry incorrect	Restore the correct rear wheel geometry Op. 4450A40
4	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check that there are no faults in the ABS control unit	Continue to Step 5	An error is detected in the control unit	Continue following the instructions for the diagnostic equipment
		Continue to Step 5	Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector See E7020 ABS
5	CHECK ON DRIFT	All OK	Problems met	Operation
	Disconnect the ABS control unit. Check whether the vehicle still drifts during braking at variable speeds	Continue to Step 6	Vehicle does not drift during braking	Replace ABS control unit Op. 3340A12 Note: Carry out filling with the diagnostic instrument in active diagnosis
6	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Test the vehicle before delivery to the customer, to check that the fault is no longer present. The test is essential, as the braking system involves a safety feature of the car		Fault persists	Search for the fault starting from another symptom'

‹ Prev Vehicle drift Next › Steering hard / (steering in both directions)

Parts & tools for this job For 2000 Alfa Romeo 147

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