Everything You Need to Know About Car Suspension
Posted on May 31, 2024
Car suspension systems are key for a comfortable, safe, and smooth ride. They combine the principles of physics and engineering to manage your car’s movements and absorb the bumps and jolts of the road.
Shock absorbers can reduce the effect of traveling over rough ground, leading to a smoother ride. On average, a car’s shock absorbers will absorb more than 2000 impacts per kilometer driven.
In this guide, we’ll break down the basics of car suspension, highlight its main parts, and explain why it's so important for your driving experience.
What is Car Suspension?
The suspension system in a car connects the vehicle to its wheels, which allows them to move smoothly. Its main job is to absorb bumps and jolts from the road to ensure a smooth ride.
A good suspension system supports the car’s weight, reduces bouncing, and keeps the tires in contact with the road for better handling. This makes steering easier and more comfortable. Plus, maintaining your suspension system can help extend your car’s lifespan.
What Does a Car Suspension Do?
A car suspension keeps your vehicle stable and smooth, regardless of road conditions. It absorbs the impact from bumps, potholes, and other obstacles, keeping you and your passengers comfortable by preventing you from feeling these jolts.
The suspension also keeps your car stable at all speeds to make sure the tires stay in contact with the road. Without a suspension system, your car would sway excessively, making it hard to control and potentially dangerous. In short, the suspension cushions your ride and helps you maintain control of your vehicle.
How Does a Car Suspension Work?
A car suspension works through a combination of components that work together to provide a smooth and stable ride. Here's a breakdown of the key parts:
1. Springs
The springs coil and uncoil to absorb the motion of the wheels. Engineers often refer to the sprung and unsprung mass of a car, based on the placement of the springs. Sprung mass is the portion of the vehicle's weight supported by the springs, while unsprung mass includes the weight of components between the road and the springs.
2. Shock Absorbers
Without shock absorbers, springs alone can't give you a smooth ride. Shock absorbers control the springs' movement by dampening them. Positioned between the car's frame and the wheels, they absorb the springs' energy. Inside a shock absorber is hydraulic fluid, which acts like an oil pump.
3. Struts
Struts are a structural part of the suspension system that combines the functions of a shock absorber and a spring in one unit. They support the vehicle's weight and help maintain alignment.
4. Anti-roll Bars
Anti-roll bars, also known as sway bars, reduce body roll during cornering. They connect opposite wheels together, helping to distribute weight more evenly and improving stability.
5. Anti-roll Bar Link Rods
Anti-roll bar link rods connect the anti-roll bar to the suspension. They transmit forces from the suspension to the bar, helping to control body roll and enhance handling.
6. Bottom Suspension Arm
The bottom suspension arm, or control arm, connects the wheel hub to the vehicle’s frame. It allows the wheels to move up and down while keeping them aligned with the road.
7. Top Strut Mount
The top strut mount connects the strut to the vehicle's body. It allows the strut to pivot and helps isolate road noise and vibrations from the cabin.
Are Front and Rear Suspension Different?
Yes, front and rear suspensions are often different. Most modern cars are front-wheel drive and use independent suspension at the front. This setup allows each wheel to move separately, providing better handling and a smoother ride.
Rear suspensions, on the other hand, don’t need to steer, so they often use dependent suspension systems with a rigid axle connecting the wheels. This axle is supported by leaf springs and shock absorbers.
In some cars, especially those with four-wheel drive, independent suspension is used at both the front and rear.
While it's possible for a car to have the same type of suspension at both ends, most vehicles use a mix of dependent and independent systems. Independent suspension is more costly to produce and isn't always needed at the rear.
Different Types of Suspension Systems
Let's explore some of the most common ones and understand how they work to keep your car comfortable and in control on the road.
1. Independent Suspension
There are several types of independent suspension systems, each with its unique design and benefits:
- MacPherson strut car suspensions
- Double-wishbone car suspensions
- Multi-link car suspensions
- Air ride suspensions
2. Dependent Suspension
Let’s see how dependent suspension systems work and their role in keeping a safe and smooth ride.
- Leaf spring car suspensions
- Trailing arm car suspensions
Each of these suspension systems provides unique advantages, contributing to better ride quality, handling, and overall vehicle performance.
How Do You Inspect Car Suspension?
Inspecting your car's suspension is crucial for a smooth and safe ride. Here's a simple guide on how to carry out a basic inspection:
1. Bounce Test
Begin by performing a bounce test. Push down firmly on each corner of the car and release. The car should bounce back up and settle within one or two bounces. Excessive bouncing or a creaking noise indicates potential issues with the suspension.
2. Examine Strut Mounts and Shock Absorbers
Open the hood of your car and locate the strut mounts and shock absorbers above each wheel. Check for any signs of damage, leakage, or rust on the mounts and absorbers. Make sure that the bolts securing them are tight and free from rust.
3. Measure Empty Space
Measure the height of the empty space between the top of the tire and the bottom of the wheel arch or wing of the car.
This measurement should be relatively equal on both sides of the vehicle, with a slight difference being acceptable. A significant difference in height indicates a potential suspension problem on the lower side.
4. Inspect Suspension Bolts
Inspect the bolts that secure the suspension components. They should be tight and free from excessive rust. If you notice rust on a bolt, gently prod the area with a screwdriver. If the rust flakes off, the bolt needs to be replaced. Tighten any loose bolts to prevent further issues.
Regular inspection and maintenance are key to keeping your suspension in optimal condition for a comfortable and safe driving experience.
How Long Does It Last?
Your car's suspension typically lasts between 80,000 and 160,000 km before needing any replacement parts. However, this can vary based on how you drive and how well you maintain your vehicle.
It's recommended to replace shock absorbers every 80,000 miles or every 5 years to maintain optimal performance and safety. Regular maintenance can help extend the lifespan of your suspension components and keep your ride smooth and comfortable.
Why Is the Suspension So Important?
Your car's suspension system plays a crucial role in maintaining a smooth and safe ride. Without it, every bump and jolt from the road would be directly felt in the car's frame and cabin, leading to a bumpy and uncomfortable journey.
By absorbing the energy from the wheels, the suspension system helps the car cabin ride safely and smoothly, even on rough roads.
Signs That Your Car Suspension is in Bad Shape
Below are a few clear signs that something might be amiss with your car's suspension:
- Loose Steering Wheel: If your steering feels less responsive or tight, it could indicate suspension issues.
- Excessive Bouncing While Driving: Excessive bouncing, diving, or bumpiness while driving may signal suspension problems.
- Leaning While Parked: If your car tilts to one side or a specific wheel when parked, your suspension might be at fault.
- Strange Noises: Listen for clunks, squeaks, or knocks from under the car, as they could indicate suspension failure.
- Uncomfortable Driving Experience: Such as rough rides can point to suspension issues.
- Nose Diving During Braking: If your car dips forward sharply when braking, it could be a sign of suspension trouble.
- Uneven Tire Wear: Check for uneven tire wear, which may suggest suspension problems needing attention.
Maintain Your Suspension for Optimal Performance
Keeping your car's suspension in top shape is key for optimal performance. Regular maintenance is a must, including checking for wear and tear, replacing damaged parts, and maintaining proper alignment and balance. These simple steps help prevent problems and make your suspension last longer.
Don't ignore signs like shaky steering or excessive bouncing after speed bumps. Our team is ready to assist with all your suspension needs. Schedule a visit with us today to keep your ride smooth for miles to come.