Why Is My Vehicle Bottoming Out? Causes and Solutions
You usually know when your vehicle bottoms out. There is a hard bang, scrape or impact from underneath the vehicle, often when driving over a speed bump, pothole, ramp or uneven road.
This happens when the suspension has no travel left to absorb the impact. Instead of cushioning the movement, the vehicle reaches the end of its suspension travel and the underside, chassis or suspension components may hit the road or another surface.
A vehicle is more likely to bottom out when it is heavily loaded, sits too low at the rear or has a suspension system that is not suited to its load, application or daily use.
If your vehicle bottoms out regularly, it should not be ignored. It can reduce driving comfort, affect stability and increase the risk of damage to the vehicle, suspension components or the load being carried.
An upgraded suspension system can help solve this. Helper springs or an air suspension system provide additional support, compensate for limited spring travel and help return the vehicle to the correct ride height. This can reduce the chance of bottoming out during normal use and improve comfort, stability and driveability.
Is your vehicle bottoming out at the front or rear?
Before choosing a solution, it is important to know where the vehicle is bottoming out: at the front axle, the rear axle or both. These are different situations and may require different suspension solutions.
The front and rear of the vehicle are often loaded in different ways. A front axle may be affected by engine weight, additional equipment or a specific vehicle conversion. The rear axle is often affected by cargo, tools, passengers, towing weight or a motorhome conversion.
That is why the right suspension advice should be based on the vehicle’s condition, application and daily use.
My vehicle is bottoming out at the front
If the front of your vehicle bottoms out, you may notice a hard impact from the front axle area when driving over speed bumps, potholes or uneven roads. This can happen when the front axle is heavily loaded or when there is not enough suspension travel left at the front.
In this situation, the front suspension can reach the bump stop. Instead of absorbing the impact smoothly, the suspension reaches the end of its travel. This can affect comfort, stability and control.
Common signs include:
1. A hard bang or knocking sound from the front of the vehicle.
2. A sharp impact that can be felt through the vehicle.
3. Less comfort when driving over bumps, ramps or uneven roads.
Possible consequences include:
1. Reduced spring travel, which affects driving comfort.
2. Increased wear on the vehicle, suspension components and load.
3. Less predictable vehicle behaviour, which can affect safety.
My vehicle is bottoming out at the rear
If the rear of your vehicle bottoms out, the vehicle may sit too low at the back and hit the bump stop when driving over speed bumps, ramps, potholes or uneven roads. This often happens when the rear axle is heavily loaded.
Rear bottoming out is common in vehicles that carry tools, goods, equipment, passengers or towing weight. It can also happen in motorhomes and converted vehicles where extra weight is added behind the rear axle.
Common signs include:
1. A hard bang, scrape or impact from the rear of the vehicle.
2. The rear of the vehicle sitting lower than normal.
3. Reduced comfort and stability when driving over uneven surfaces.
Possible consequences include:
1. Little or no spring travel, which reduces comfort.
2. Increased wear on the vehicle, suspension components and load.
3. Less stable or less predictable handling, especially when the vehicle is loaded.
Find the right suspension solution for your vehicle
For many vehicles, bottoming out can be reduced or prevented with the right suspension solution. Depending on your vehicle, load and application, this may be a helper spring system, a semi air suspension system or a full air suspension system.
The right solution depends on where the vehicle is bottoming out, how the vehicle is used and whether there are any other wishes or problems, such as sagging, instability, low ride height or reduced comfort.
Use the Product Finder to find a suitable solution for your specific make and model. This helps you check which suspension systems are available for your vehicle and which option best matches your situation.
Related vehicle suspension problems
Bottoming out is often related to other suspension problems. A vehicle may also be sagging, sitting too low, leaning to one side, feeling unstable or reacting harshly to small bumps.
These problems can look similar, but the right solution may differ depending on the vehicle, load and application. If you are not sure which problem applies to your vehicle, a VB-Partner can inspect the situation and advise on a suitable suspension solution.
VB-Partners can help with advice, quotations, fitting, repair and maintenance. They are trained to work with VB-Airsuspension systems and can help determine which solution is suitable for your vehicle.
