What is the main purpose of a leaf spring in a vehicle?

The main purpose of a leaf spring is to support the weight of the vehicle and its cargo, maintain the correct ride height, and allow the axle to move up and down in response to road conditions. They are particularly effective in vehicles designed to carry heavy loads.

How long do leaf springs typically last?

Leaf springs are generally very durable and can last for a significant portion of a vehicle’s lifespan, often well over 100,000 miles. However, their longevity can be reduced by consistently overloading the vehicle, frequently driving on very rough terrain, or exposure to corrosive elements like road salt, which can lead to rust and cracking.

Can a broken leaf spring cause a knocking noise?

Yes, absolutely. A very common symptom of a failing leaf spring (or its worn bushings) is a knocking, clunking, or rattling noise heard, especially when driving over bumps or uneven surfaces. This noise often indicates that the spring’s leaves are broken, loose, or that the mounting bushings are worn out.

Is it safe to drive with a broken leaf spring?

No, it is not safe to drive with a broken or severely compromised leaf spring. A broken spring severely impairs your vehicle’s ability to support weight, maintain ride height, and handle properly. This can lead to significant handling instability, tire damage, and a heightened risk of losing control, especially when turning or carrying a load. Immediate repair by a professional is necessary.

Will replacing leaf springs require a wheel alignment?

Yes, replacing leaf springs typically requires a four-wheel alignment afterward. Changing the leaf springs directly affects the vehicle’s ride height and the positioning of the rear axle, which can alter the thrust angle and overall alignment. An alignment ensures your wheels are correctly oriented for proper handling, stability, and to prevent premature, uneven tire wear.