22 · Diagnostics

Drift whilst braking

Make: Fiat
Model: 500 Factory Service Manual
Year: 2007–2024
Section: Steering – vehicle behaviour › Drift whilst braking

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Fault diagnosisDrift whilst braking

DRIFT WHILST BRAKING

1.2 8v, 1.3 Multijet

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	Operation
		Test results
	First of all, check the type, condition and pressure of the tyres. Check that the wheel bolts are correctly fastened.	Move on to Step 1	1. Tyre inflation pressure not correct 2. Tyres unsuitable or worn 3. Wheel bolts not correctly tightened.	1. Make sure tyres are inflated to the correct pressure. 2. Replace the tyres. 3. Tighten the wheel bolts to the correct torque.
1	BRAKING SURFACES CHECK	All OK	Problems encountered	Operation
	Check: the condition of the front pads braking surfaces;	Move on to Step 2	1. Brake surfaces vitrified or with traces of grease, oil or water 2. Front pads damaged or not the recommended type.	1. Clean again, check and remove the causes of the fault 2. Replace the front pads Op. 3310A60 FRONT BRAKE PADS - REPLACE
2	FRONT DISCS AND CALLIPERS CHECK	All OK	Problems encountered	Operation
	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. 2. Front calliper pistons worn or seized.	1. Replace the front discs Op. 3310A52 FRONT BRAKE DISCS - R+R WITH BRAKE CALIPERS REMOVED 2. Replace the front brake callipers Op. 3310A32 FRONT BRAKE CALIPERS - R.R.
3	REAR DRUM CHECK	All OK	Problems encountered	Operation
	Check the condition of the rear drums. Check the condition of the rear shoe control cylinder.	Move on to Step 4	1.Rear drums worn or damaged. 2.Shoe control cylinder worn or seized.	1.Replace the rear drums Op. 3320B30 REAR BRAKE DRUM (ONE), LEFT OR RIGHT - R.R. 2.Replace the shoe control cylinder Op. 3320B20 REAR BRAKE SHOE CYLINDER (ONE) LEFT OR RIGHT - REPLACE.
4	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket. Check that there are no faults in the ABS control unit.	Move on to Step 5	1. Error detected in the control unit. 2. No communication with the control unit.	1. Continue following the instructions on the diagnostic equipment 2. Restore connection between the ABS control unit and the diagnostic connector See E7020 ABS
5	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the Examiner diagnostic equipment connected carry out the active diagnosis of: pump motor; solenoid valves.	Move on to Step 6	Pump and/or solenoid valves faulty.	Replace the ABS electronic control unit electrohydraulic unit Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.
6	FRONT GEOMETRY CHECK	All OK	Problems encountered	Operation
	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. 2. Geometry not correct 3. Angles 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. 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. Restore correct angles Op. 4450A10 FRONT WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT - INCLUDES ADJUSTMENT IF NECESSARY
7	REAR GEOMETRY CHECK	All OK	Problems encountered	Operation
	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. 2. Geometry not correct. 3. Angles not correct.	1. Check and, if necessary, replace the shock absorber Op. 4420A30 REAR SUSPENSION SHOCK ABSORBER (ONE), LEFT OR RIGHT - R.R. - CHECK WHEEL GEOMETRY SEPARATELY 2. Check and, if necessary, replace the spring Op. 4420A40 L/H OR R/H REAR SUSPENSION COIL SPRING (ONE) - R+R 3. Restore correct angles Op. 4450A40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT, INCLUDES ADJUSTMENT IF NECESSARY

1.4 16v

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	Operation
		Test results
	First of all, check the type, condition and pressure of the tyres. Check that the wheel bolts are correctly fastened	Move on to Step 1	1. Tyre inflation pressure not correct 2. Tyres unsuitable or worn 3. Wheel bolts not correctly tightened	1. Make sure tyres are inflated to the correct pressure 2. Replace the tyres 3. Tighten the wheel bolts to the correct torque
1	BRAKING SURFACES CHECK	All OK	Problems encountered	Operation
	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 2. Front pads damaged or not the recommended type 3. Rear pads damaged or not the recommended type	1. Clean again, check and remove the causes of the fault 2. Replace the front pads Op. 3310A60 FRONT BRAKE PADS - REPLACE 3. Replace the rear pads Op. 3310B62 REAR BRAKE PADS - REPLACE
2	FRONT DISCS AND CALLIPERS CHECK	All OK	Problems encountered	Operation
	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 2. Front calliper pistons worn or seized.	1. Replace the front discs Op. 3310A48 FRONT BRAKE DISC (ONE), LEFT OR RIGHT - R.R 2. Replace the front brake callipers Op. 3310A30 FRONT BRAKE CALIPER (ONE) - R.R
3	REAR DISCS AND CALLIPERS CHECK	All OK	Problems encountered	Operation
	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 2. Rear calliper pistons worn or seized	1. Replace the rear discs Op. 3310B48 REAR BRAKE DISC (ONE), LEFT OR RIGHT - R.R. 2. Replace the rear brake callipers Op. 3310B36
4	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect the Examiner diagnostic equipment to the diagnostic socket. Check that there are no faults in the ABS control unit	Move on to Step 5	1. Error detected in the control unit 2. No communication with the control unit	1. Continue following the instructions on the diagnostic equipment 2. Restore connection between the ABS control unit and the diagnostic connector See E7020 ABS
5	ACTIVE DIAGNOSIS WITH DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the Examiner diagnostic equipment connected carry out the active diagnosis of: - pump motor; - solenoids	Move on to Step 6	Pump and/or solenoids faulty	Replace the ABS electronic control unit electrohydraulic unit Op. 3340A12 ABS HYDRAULIC AND ELECTRONIC CONTROL UNIT - R.R.
6	FRONT GEOMETRY CHECK	All OK	Problems encountered	Operation
	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 2. Geometry not correct 3. Angles 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. 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. Restore correct angles Op. 4450A10 FRONT WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT - INCLUDES ADJUSTMENT IF NECESSARY
7	REAR GEOMETRY CHECK	All OK	Problems encountered	Operation
	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 2. Geometry not correct 3. Angles not correct	1. Check and, if necessary, replace the shock absorber Op. 4420A30 REAR SUSPENSION SHOCK ABSORBER (ONE), LEFT OR RIGHT - R.R. - CHECK WHEEL GEOMETRY SEPARATELY 2. Check and, if necessary, replace the spring Op. 4420A40 L/H OR R/H REAR SUSPENSION COIL SPRING (ONE) - R+R 3. Restore correct angles Op. 4450A40 REAR WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT, INCLUDES ADJUSTMENT IF NECESSARY

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Parts & tools for this job For 2007 Fiat 500

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