Replacing the leaf springs on a Mercedes Benz C-Class C350 can be a complex task that requires a good understanding of automotive mechanics, specialized tools, and safety precautions. click here for more details on the download manual…..

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Here’s a detailed description of how to perform this task, including the components involved.

### Tools and Equipment Needed

1. **Safety Gear**
– Safety glasses
– Gloves
– Steel-toed boots

2. **Tools**
– Jack and jack stands
– Ratchet and socket set (metric sizes)
– Wrenches (metric sizes)
– Torque wrench
– Pry bar
– Hammer
– Spring compressor (if needed, though leaf springs are less commonly compressed)
– Brake cleaner
– Lubricant (like WD-40 or similar)

3. **Replacement Parts**
– New leaf springs (specific to the C350 model)
– New bushings (if applicable)
– New U-bolts (if needed)
– New shock absorbers (optional but recommended during replacement)

### Steps to Replace Leaf Springs

1. **Preparation**
– Park the vehicle on a level surface and engage the parking brake.
– Disconnect the negative battery terminal to prevent any electrical issues.

2. **Lifting the Vehicle**
– Use the jack to lift the rear of the vehicle.
– Secure the vehicle with jack stands under the frame to ensure safety.

3. **Removing the Wheels**
– Remove the rear wheels using the ratchet and socket.
– Set the wheels aside in a safe location.

4. **Removing the Shock Absorbers**
– Locate and remove the upper and lower bolts of the shock absorbers using the ratchet and wrench.
– Once the bolts are removed, take out the shock absorbers from their mounts.

5. **Removing the Leaf Springs**
– **Identify Mounting Points**: The leaf springs are typically mounted at two points: one at the front (often in the frame) and one at the rear (often using U-bolts).

– **Remove U-bolts**: Use the ratchet and socket to remove the nuts from the U-bolts securing the leaf spring to the axle. Carefully support the axle with a jack if needed.

– **Remove Front Bolts**: Locate the front mounting bolts of the leaf springs. Use the ratchet and wrench to remove these bolts.

– **Pry and Remove**: If the leaf spring is stuck, use a pry bar to gently lift it away from the mounting points. Be cautious not to damage surrounding components.

6. **Installing New Leaf Springs**
– **Position New Leaf Springs**: Place the new leaf springs in the same position as the old ones. Align the front and rear mounting points.

– **Install Front Bolts**: Insert the new or existing front bolts into the front mounting points and tighten them to the manufacturer’s specifications using the torque wrench.

– **Install U-bolts**: Position the U-bolts over the axle and through the leaf spring. Install the nuts and tighten them evenly to secure the leaf spring to the axle.

7. **Reinstalling Shock Absorbers**
– Reinstall the shock absorbers in the reverse order of removal. Ensure they are properly seated and fasten the bolts.

8. **Reinstalling the Wheels**
– Place the rear wheels back onto the hub and hand-tighten the lug nuts.
– Lower the vehicle from the jack stands using the jack.
– Once on the ground, fully tighten the lug nuts in a crisscross pattern for even distribution.

9. **Final Checks**
– Reconnect the negative battery terminal.
– Check all bolts and fasteners to ensure they are tight and secure.
– Inspect the area to ensure that no tools or parts are left behind.

10. **Test Drive**
– Take the vehicle for a short test drive to check for any unusual noises or handling issues.
– After the test drive, recheck the torque on all bolts and fasteners.

### Safety Precautions
– Always ensure the vehicle is securely lifted and supported before working underneath it.
– Use appropriate tools and ensure they are in good condition.
– If you are unfamiliar with vehicle repairs, consider seeking help from a professional mechanic.

### Conclusion
Replacing leaf springs on a Mercedes Benz C-Class C350 involves understanding the components and following a systematic process. Ensure you have the right tools and parts, and take all necessary safety precautions. If you feel uncertain about any part of the process, it may be best to consult a professional.
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