16 · Diagnostics

H02 Drifting when braking

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Steering – car handling › H02 Drifting when braking

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Fault diagnosisH02 Drifting when braking

H02 Drifting when braking

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

If necessary, carry out a test on a straight, flat road with no cambers.

Check the effective deviation from the trajectory by braking and very carefully loosening your grip on the steering wheel

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Preliminarily, check the type, condition and inflation pressure of the tyres Check that the wheels are correctly fixed	OK	Move onto step 1
		Tyre inflation pressure not correct	Restore the tyre inflation pressures End of diagnosis
		Tyres not suitable or worn	Replace the tyres End of diagnosis
		Wheel fixing not correct	Tighten the wheels correctly Op. 4450B10 End of diagnosis
1	CHECK PAD TYPE AND SURFACE Check: condition of pad friction surfaces pad type	OK	Move onto step 2
		Friction surfaces vitrified or with traces of grease, oil or water	Clean, check and eliminate the causes of the fault End of diagnosis
		Front brake pads damaged or wrong type	Replace pads Op. 3310A60 End of diagnosis
		Rear pads damaged or wrong type	Replace the padsOp. 3310B60 End of diagnosis
2	CHECK DISCS Check: the condition of the brake discs the type of discs	OK	Move onto step 3
		Front discs worn or damaged	Skim or if necessary replace the discs Op. 3310A48 End of diagnosis
		Rear discs worn or damaged	Replace the discs or, if necessary, replace them Op. 3310B48 End of diagnosis
3	CHECK BRAKE CALIPERS Check the condition of the brake caliper pistons	OK	Move onto step 4
		Front caliper pistons worn or seized	Replace brake calipers Op. 3310A30 End of diagnosis
		Rear brake calipers worn or seized	Replace brake calipers Op. 3310B36 End of diagnosis
4	CHECK WITH DIAGNOSTIC EQUIPMENT Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket Check that there are no faults in the ABS control unit.	OK	Move onto step 5
		An error is detected in the control unit	Continue according to the instructions for the diagnostic equipment End of diagnosis
		Lack of dialogue with the control unit	Restore: the connection between the ABS control unit and the diagnostic connector the supply for the ABS control unit (Wiring diagram E7020 ABS ). End of diagnosis
5	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT Using the diagnostic equipment (Examiner or other instruments) carry out the active diagnosis of: pump motor solenoid valves	OK	Move onto step 6
5		Fault detected in the pump or a solenoid	Replace electrohydraulic unit-electronic control unit Op. 3340A12 End of diagnosis
6	CHECK BRAKE CIRCUIT Check the condition of the brake circuit	OK	Move onto step 7
6		Leaks or damage in the components of the circuit	Replace the components involved or replace the brake servo unit Op. 3330D10 End of diagnosis
7	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
7		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev H01 Vehicle drifting Next › H10 Stiff steering (in both directions)

Parts & tools for this job For 1997 Alfa Romeo 156

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