The coil spring is the most common way modern cars support their weight and absorb bumps. Made from tightly wound spring steel, it compresses when a wheel hits a bump and pushes back to keep the tire on the road. Coil springs store energy efficiently and pack a lot of travel into a small space, which is why they dominate front and rear suspensions. A broken or sagging spring throws off ride height, alignment, and handling.
Animated: how a Coil Spring actually works
🔧 How It Works, Step by Step
1
Spring carries the load
At rest, the coil spring holds up its share of the car's weight at that corner.
2
Bump compresses the coil
When the wheel rises over a bump, the spring compresses and stores that energy.
3
Spring pushes back
The stored energy pushes the wheel back down to keep the tire touching the road.
4
Damper controls rebound
The paired shock absorber prevents the spring from bouncing repeatedly.
5
Ride height is maintained
Between bumps, the spring holds the car at its designed height and stance.
🧩 The Key Parts
Spring steel coil
The wound wire that compresses and rebounds to absorb loads.
Spring seats
Cushioned mounts at each end that locate the spring and reduce noise.
Isolators
Rubber pads that quiet the spring and protect the mounting surfaces.
Paired damper
The shock or strut that controls the spring's motion.
📋 Free OBD2 Code Cheat Sheet
The 50 most common check engine codes with likely cause and DIY fix cost. Sent once.
🩺 Signs of a Failing Coil Spring
One corner of the car sits lower
Clunking or popping over bumps
Uneven tire wear
Car leans or sways more than usual
A visible gap or broken coil end
⚠️ Common Problems
Broken coil
Corrosion or fatigue can snap a spring, dropping ride height and causing noise and poor handling.
Sagging spring
A weakened spring lowers one corner, upsetting alignment and tire wear.
Corrosion
Rust from road salt weakens the steel and is a common cause of eventual failure.
💰 Cost to Fix
$300-$700 per axletypical range to repair or replace, parts and labor
❓ FAQ
What causes a coil spring to break?
Metal fatigue, corrosion from road salt, and stress from potholes are the main causes, often near the end coils.
Can I drive with a broken coil spring?
It is risky. A broken spring hurts handling, can damage the tire, and lets the corner sag, so replace it promptly.
Should coil springs be replaced in pairs?
Replacing both springs on an axle is recommended so ride height and handling stay even side to side.
Think your Coil Spring is failing?
Get a free AI diagnosis ranked by probability for your exact year, make, and model in 30 seconds.