5. DIAGNOSIS FRONT SUSPENSION & REAR SUSPENSION Always road test the vehicle first before coming to any conclusion, Do some preliminary visual inspection and correct any defects if found. 1. Inspect the tyre pressures and tyre wear. 2. Lift the vehicle using two post lift and inspect front and rear suspension for loose or damaged parts. 3. Rotate the wheels and check for out-of round tyres, bent rims, loose or rough wheel bearings. 4. Detailed inspection of parts / sub assembly of rear suspension is given in Inspection Section. CONDITION PROBABLE DEFECT CORRECTIVE ACTION Directional Instability and Vehicle Pulling 1. Mismatched / uneven tyres wear. 2. Cracked / broken or sagging springs. 3. Improper tyre inflation Misaligned front wheel 4. geometry/rear wheel geometry 5. Loose, bent or broken suspension parts 1. Check and adjust front wheel alignment / rear wheel geometry 2. Adjust tyre pressure 3. Replace tyre 4. Replace spring 5. Tighter or replace suspension Parts Unusual Excessive Tyre Wear 1. Sagged springs or set springs 2. Tyres imbalanced 3. Faulty strut 4. Misaligned front and rear wheel geometry 5. Vehicle over loaded 6. Loose or worn out wheel bearing 7. Tyre inflation not proper 1. Replace spring 2. Balance or replace tyres 3. Replace Strut 4. Adjust the wheel alignment at front / rear ends 5. Check Loading 6. Replace wheel bearing 7. Adjust tyre pressure Wheel tramp 1. Bump on tyre 2. Improper strut action 1. Replace tyre 2. Replace strut Vehicle Shaking Vibrations 1. Wheels out of balance 2. Loose wheel bearings 3. Worn out tie rod ends 4. Worn out lower ball joints 5. Excessive wheel run out 6.Disturbed front / rear end alignments 1. Balance wheels or replace tyre or wheel 2. Replace wheel bearings 3. Replace tie rod end 4. Replace ball joint or lower link at front 5. Repair / replace wheel or tyre 6. Check and adjust front / rear end alignments Suspension Bottoms 1. Vehicle overloaded 2. Damaged bump stopper 3. Springs set permanently broken 4. Faulty dampers 1. Check loading 2. Replace bump stopper 3. Replace springs / sagging. 4. Replace dampers Low or uneven trim height 1. Broken or sagging springs 2. Vehicle overloaded 3. Springs incorrect 1. Replace the springs 2. Check the load 3. Replace the springs SUSPENSION_PETROL 16
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