Having carried out the road test, during the

See table S015 NOISE WHILST DRIVING

, there was a knocking noise from the front.

Continue according to the circumstances in which the noise occurs

1. The noise disappears when the brake pedal is operated

2. The noise occurs whilst accelerating or braking with the wheels steered.

3. The noise only occurs during acceleration or braking

4. The noise is also present in other conditions.

1. Restore the correct tightening of the front brake calipers to the steering knuckle.

2. Replace the wheel bearing on the side where the fault occurred

Op. 4450C32

, fitting it with the magnetic track facing the steering knuckle seal

This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because they could alter the gap and prevent a correct reading from the sensor

3. Move on to Step 1

4. Move on to Step 1

Raise the vehicle on a two column lift and rotate the front wheels by hand.

Make sure that there are no impediments to the movement or noise during rotation.

1. Replace the constant velocity joint

Op. 2710A54 WHEEL SIDE CONSTANT VELOCITY JOINT (ONE), LEFT OR RIGHT - R + R WITH DRIVESHAFT REMOVED - INCLUDES BOOT REPLACEMENT

Check that the bolts fixing the differential side joint flange are correctly tightened.

"Only for vehicles with flanged driveshafts".

1. Gearbox side constant velocity joint chamber broken

2. Wheel side constant velocity joint chamber broken

3. Wheel side joint worn.

1. Replace the constant velocity joint

Op. 2710A24 DIFFERENTIAL SIDE CONSTANT VELOCITY JOINT (ONE) L/H OR R/H - R + R WITH DRIVE SHAFT REMOVED - INCLUDES BOOT REPLACEMENT

2. Replace the constant velocity joint

Op. 2710A54

3. Replace the constant velocity joint

Op. 2710A54

Check the condition of the wheel side boot.

If it is not intact, check that there are no leaks or no grease in the actual boot.

If everything is okay and the noise was more pronounced whilst steering, check the wheel bearings.

1. Boot broken.

2. Grease leaks/no grease.

3. Wheel bearing faulty.

1. Replace the boot

Op. 2710A54

2. Renew the correct amount of grease of the appropriate type

Op. 2710A54

3. Replace the wheel bearing on the side where the fault occurred

Op. 4450C32

, fitting it with the magnetic track facing the steering knuckle seal.

This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings because they could alter the gap and prevent a correct reading from the sensor.

Check the condition of the differential side boot.

If it is not intact, check that there are no leaks or no grease in the actual boot.

1. Boot broken

2. Grease leaks/No grease

1. Replace the boot

Op. 2710A24

2. Renew the correct amount of grease of the appropriate type

Op. 2710A24

Raise the vehicle on a two column lift and check that there are no oil leaks from the shock absorber stem.

Slight dampness on the stem is considered normal because there is evaporation during the operation of the shock absorber.

If there is a persistent oil leak on the shock absorber stem, make sure that it is not coming from other parts of the vehicle that are lubricated

1. Leaks from other parts that are lubricated

1. Leaks from the shock absorber stem

1. Search for the cause of the leak following the appropriate diagnostic procedure

1. 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

Check that there are no signs of interference between the suspension elements and the bodyshell and between the latter and the liner.

In particular, check that there are no signs of wear on the suspension springs and that they do not show signs of abrasion.

If the spring shows signs of abrasion, its mechanical properties could be weakened as a result of oxidation

2. Inteference due to incorrect fitting

Abrasions or non conformity of the spring

2. Eliminate the interference and restore the correct fastening. If this is not possible, replace the defective components

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

taking care to fit it correctly

Check that there is no clearance between the track control arm ball joints and that the boot is intact; to do this loosen the bolt connecting the track control arm to the front steering knuckle.

Also check the condition of the suspension bushes

Replace the track control arm

Op. 4410B40 LOWER TRACK CONTROL ARM (WITH BALLJOINT) FOR LEFT OR RIGHT FRONT SUSPENSION (ONE) - R+R - CHECK WHEEL GEOMETRY SEPARATELY

Locate the area of the possible noise source: top or bottom.

Starting from the area where the knocking was identified, check by carrying out the

See Test 4410OA CORRECT TIGHTENINGS FOR FRONT SUSPENSION CHECK

the tightening torques of the fixing bolts for:

• Shock absorber stem to turret mounting end of travel plate
• To the shock absorber bracket strut
• The steering box to the crossmember
• The steering rod to the steering knuckle
• The anti-roll bar to the crossmember
• The connecting rod to the shock absorber
• The connecting rod to the anti-roll bar
• The front bush for the arm to the crossmember
• The rear bush for the arm to the crossmember
• The track control arm ball joint to the steering knuckle
• The front fastening securing the crossmember to the body side member
• The middle rear fastening securing the crossmember to the bracket on the floor
• The rear fastening securing the crossmember to the body side member
• The fastening securing the third load line to the crossmember
• The side fastening securing the third load line to the crossmember
• The side rod fastening to the crossmember and to the body
• The engine mounting connecting rod to the crossmember
• The fastening securing the brake caliper to the steering knuckle

1. There is clearance for the bearing

2. The bearing is not in place

1. Replace the bearing

Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

2. If the bearing is not damaged, fit it correctly. If this is not the case, replace the mounting.