The suspension connects your wheels to the vehicle. It carries the weight, absorbs bumps and keeps the tires on the road, so it affects comfort, handling and safety. This beginner's guide explains the main parts and what to look for as they wear.
What the suspension does
When a wheel hits a bump, the springs compress and absorb the impact. The shocks or struts then damp the movement, so the car settles instead of bouncing. The arms, links and bushings hold the wheels in the right position while they move up and down.
The main parts
- Springs: coil springs, leaf springs or torsion bars carry the vehicle's weight.
- Shock absorbers: damp spring movement. They do not support the weight.
- Struts: a strut combines a shock and a structural part of the suspension, and carries the spring on many cars. Struts also set the wheel's position.
- Control arms and ball joints: connect the wheel hub to the frame and allow movement and steering.
- Bushings: rubber or polyurethane cushions in the joints that reduce noise and vibration.
- Sway bars (anti-roll bars): reduce body roll in corners.
- Tie rods: link the steering to the wheels.
Common suspension layouts
Most cars use MacPherson struts at the front. Trucks and SUVs often use a solid axle at the rear with leaf or coil springs, and many use double-wishbone front suspension. The layout decides which parts you will replace, so check the exact parts for your vehicle.
Signs of wear
- The vehicle bounces repeatedly after a bump.
- Nose dive when braking or squat when accelerating.
- Clunks or rattles over bumps.
- Uneven or cupped tire wear.
- The vehicle leans in corners, or pulls to one side.
- Fluid leaking from a shock or strut.
Shocks and struts wear gradually, so you often adapt without noticing. Many makers suggest inspecting them around 50,000 miles. Replace them in pairs on the same axle, and get an alignment after replacing struts or control arms.
Upgrades
Upgrading to performance shocks, springs or sway bars can improve handling, ride quality, towing stability or ride height. Brands like Bilstein and KYB offer replacement and upgrade shocks for many vehicles. Our guides on Bilstein B6 vs B8 and suspension upgrades for ride quality help you choose.
Common questions
How do I know if my shocks are bad?
Look for bouncing, nose dive, leaks and uneven tire wear. A bounce test, pressing down on a corner and releasing, should settle in one or two bounces.
Should I replace shocks in pairs?
Yes, on the same axle, so the two sides behave the same.
Will new shocks lift my vehicle?
Not by themselves. Ride height comes from the springs, though some adjustable shocks and leveling kits change it.
Where to buy
Shop suspension and components. We are an authorized dealer for every brand we sell, shipping is free anywhere in the USA, and returns are accepted within 60 days (unused, in the original packaging) and return shipping is free. Not sure what fits your vehicle? Contact our support team and we will help you check before you order.