Worn shock absorbers and braking distance: what changes in industrial vehicles

When we talk about safety in industrial vehicles, attention focuses above all on brakes and tyres. However, there is another component that contributes to the behavior of the vehicle during braking: the shock absorber.

The relationship between worn shock absorbers and braking distance This is important because the shock absorbers control the movements of the suspension and help the tires maintain more stable contact with the road. Their efficiency takes on particular importance in trucks subjected to high loads, long distances and intensive use.

Shock absorbers and braking: what function do they perform?

During braking, the weight of the vehicle tends to transfer towards the front. This phenomenon, known as load transfer, causes a compression of the front suspensions and a lightening of the rear ones.

The shock absorbers have the task of controlling these movements, limiting oscillations and excessive variations in the structure. When they work correctly they contribute to:

• keep the vehicle more stable;
• check pitch;
• maintain contact between tires and road;
• make the suspension response more progressive;
• improve control of the vehicle in emergency manoeuvres.

Their operation must be evaluated as part of a system composed of suspension, tires, brakes and chassis.

Worn shock absorbers and braking distance: what changes?

A worn shock absorber can no longer properly control the oscillations of the suspension. As a result, the wheel may lose some of the stability needed to maintain smooth contact with the road surface.

This condition can negatively affect the overall effectiveness of braking, in particular on:

• uneven asphalt;
• wet surfaces;
• bad roads;
• sudden braking;
• journeys with high loads;
• curves faced during deceleration.

The effect on stopping distance varies depending on the vehicle, load, speed, tire condition and level of component wear. It is therefore not correct to attribute a universal distance to the problem, but it is important to recognize that inefficient suspension can reduce stability and grip during braking.

How does a truck with worn shock absorbers behave when braking?

When the shock absorbers lose their effectiveness, the truck may exhibit more noticeable pitching, with the front end tending to sag excessively.

The driver may perceive:

• greater instability;
• oscillations after braking;
• less precise steering response;
• more marked shifts of the load;
• vibrations coming from the suspensions;
• difficulty maintaining the trajectory.

These symptoms do not necessarily indicate a single fault. They can also depend on tires, brakes, air springs, bushings or other elements of the suspension system. A complete check carried out by qualified personnel is therefore necessary.

Tires and shock absorbers: why they work together

Tires represent the only point of contact between the vehicle and the road. To correctly develop grip and braking force they must remain in contact with the road surface as much as possible.

If the shock absorber does not control the oscillations, the pressure exerted by the wheel on the road can become less uniform. Furthermore, inefficient suspensions can promote uneven tread wear, further reducing the effectiveness of the tires.

Checking only the braking system, therefore, may not be sufficient to identify the cause of anomalous behavior.

What are the signs of worn shock absorbers?

Among the main signs of worn shock absorbers we find:

• excessive front lowering when braking;
• repeated oscillations after potholes or unevenness;
• instability when cornering;
• irregular tire wear;
• noises coming from the suspensions;
• visible leaks on the component;
• increased vibration;
• reduction in driving comfort.

In the presence of one or more symptoms it is advisable to have the vehicle checked by a professional.

Maintenance of shock absorbers in industrial vehicles

Trucks, buses and trailers often operate with large loads, long distances and variable road conditions. Shock absorber maintenance is not just about comfort, but contributes to stability, suspension efficiency and operational safety.

WayAssauto develops shock absorbers and solutions for industrial vehicles designed to meet the needs of the professional market. To locate the correct component you can consult the catalog or contact technical support, indicating the model, application and OE number of the vehicle.