23 · Diagnostics

Drift whilst braking

Make: Alfa Romeo
Model: Brera and Spider Factory Service Manual
Year: 2005–2010
Section: Steering – vehicle behaviour › Drift whilst braking

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Fault diagnosisDrift whilst braking

DRIFT WHILST BRAKING

The vehicle tends to drift to the left or the right whilst braking. If necessary, carry out a road test on a straight, flat road without transverse gradients to check the effective drift

0	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	First of all, check that the tyres are the correct type, in good condition and correctly inflated. Check that the wheel bolts are correctly fastened.	Move on to Step 1	1. Tyre inflation pressure not correct	1. Make sure tyres are inflated to the correct pressure.
			2. Tyres unsuitable or worn	2. Replace the tyres
			3. Wheel bolts not correctly fastened.	3. Tighten the wheel studs correctly.
1	BRAKING SURFACES CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check: the condition of the front pads braking surfaces; the condition of the rear pads braking surfaces;	Move on to Step 2	1. Brake surfaces vitrified or with traces of grease, oil or water	1. Clean again, check and remove the causes of the fault
			2. Front pads damaged or not the recommended type.	2. Replace the front pads Op. 3310A60 FRONT BRAKE PADS - REPLACE
			3. Rear pads damaged or not the recommended type.	3. Replace the rear pads Op. 3310B62 REAR BRAKE PADS - REPLACE
2	FRONT DISCS AND CALIPERS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the front brake discs. Check the condition of the front brake caliper pistons.	Move on to Step 3	1. Front discs worn or damaged	1. Regrind the discs or, if necessary, replace them Op. 3310A48 FRONT BRAKE DISC (ONE), LEFT OR RIGHT - R.R
		Move on to Step 3	2. Front caliper pistons worn or seized.	2. Replace the front brake calipers Op. 3310A30 FRONT BRAKE CALIPER (ONE) - R.R
3	REAR DISCS AND CALIPERS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the rear brake discs. Check the condition of the rear brake caliper pistons.	Move on to Step 4	1. Rear discs worn or damaged.	1. Regrind the discs or, if necessary, replace them Op. 3310B48 REAR BRAKE DISC (ONE), LEFT OR RIGHT - R.R.
		Move on to Step 4	2. Rear caliper pistons worn or seized.	2. Replace the rear brake calipers. Op. 3310B36 REAR BRAKE CALIPER (ONE), LEFT OR RIGHT - R.R
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic test equipment (Examiner or other instruments) to the tester input. Check that there are no faults in the ABS control unit.	Move on to Step 5	1. Error detected in the control unit.	1. Continue following the instructions for the diagnostic equipment
		Move on to Step 5	2. No communication with the control unit.	2. Restore connection between the ABS control unit and the diagnostic connector See E7022 VDC
5	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the diagnostic equipment (Examiner or other instruments) and carry out the active diagnosis for: Pump motor; Solenoid valves.	Move on to Step 6	Pump and/or solenoid valves faulty.	Replace the electronic control unit electrohydraulic unit Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.
6	FRONT GEOMETRY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the vehicle geometry and front wheel angles Op. 4450A10 FRONT WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT - INCLUDES ADJUSTMENT IF NECESSARY	Move on to Step 7	1. Geometry not correct.	1. Check and, if necessary, replace the shock absorber Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R
			2. Geometry not correct	Check and, if necessary, replace the spring Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R
			3. Angles not correct.	3. Restore correct angles Op. 4450A10 FRONT WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT - INCLUDES ADJUSTMENT IF NECESSARY
7	REAR GEOMETRY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the vehicle geometry and rear wheel angles Op. 4450A40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT, INCLUDES ADJUSTMENT IF NECESSARY	End of diagnosis	1. Geometry not correct.	1. Check and, if necessary, replace the shock absorber Op. 4420A12 REAR SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMENTLING/REBUILDING OF ASSEMBLY AT BENCH R R
			2. Geometry not correct	Check and, if necessary, replace the spring Op. 4420A12 REAR SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMENTLING/REBUILDING OF ASSEMBLY AT BENCH R R
			3. Angles not correct.	3. Restore correct angles Op. 4450A40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT, INCLUDES ADJUSTMENT IF NECESSARY

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