Responsibility for our products
Brakes in a car must be reliable and effective, because they determine the safety of road users. The efficiency of brakes directly depends on their structure. Brake pads and brake linings play such a significant role, that it is of huge importance to regularly check their technical condition.
Quality-assurance procedures we follow in our day-to-day operations are compliant with the ISO 9001:2015 and ISO 14001:2015, PN-N-18001:2004 standards as well as the IATF 16949 technical specification.
This system is being constantly improved, since quality assurance is the daily duty of our organization as a whole and of every member of our staff.
We understand the significance of active involvement and personal responsibility of all employees in the improvement of all processes in the company, which allows us to ensure and increase customer satisfaction.
Our company operates in conformity with environmental protection regulations, that is why we implemented an environmental management system compliant with the ISO 14001 standard. What is more, we do not use any heavy metal compounds, which could pose a threat to the environment and car users. Apart from safe manufacturing, we also deal with recycling and waste disposal. We collect and process used brake linings and brake pads from workshops and service stations. Waste disposal methods we employ are in line with the principles of recycling. Materials we recover in this way are reused as components for the manufacture of new braking system components.
Our products are ECE R-90 and R-13-certified.
Research and development
For many years LUMAG has been running robust R&D activities, allowing us to offer safe, modern and top-quality products to our customers. We are always on the lookout for new solutions and we modernize our products to meet growing customer needs.
Our in-house laboratory develops formulas enabling us to manufacture long-life, heavy-duty products, featuring high braking efficiency within a broad range of temperature, speed and load. It is possible thanks to strict tests run on devices simulating real-life use conditions and on test vehicles.
A cutting-edge testing station coupled with the passion and enthusiasm of a close-knit team of engineers enables us to accept even the most challenging projects. It is thanks to this combination that we have managed to successfully develop friction materials meeting OEM requirements and launch their mass production.
1. Functioning in high temperatures
Frequent, sudden and long braking, especially of vehicles with a large mass, causes intensive heating of brakes. For this reason, maintaining braking efficiency by brakes heated to a high temperature is their significant operational feature, with a decisive impact on road safety.
During short and light braking, when the friction assembly does not heat up a lot, drum and disc brakes feature equal efficiency. It is only when they are significantly heated, does the difference in their efficiency surface.
There are two factors causing a drop in the braking torque:
- Expandability of brake components, which is especially true for drum brakes
- Susceptibility to fading of a friction material brake pads are made of
Hardness of a material determines its capability to resist plastic deformation when pressure is applied locally to a small area. Usually resistance to wear increases with hardness, but there are many exceptions to this rule of thumb. Therefore, hardness does not directly translate into resistance to wear.
Hardness determines the value of per-unit pressure on the surfaces of real contact between the two friction assembly components. The higher the hardness, the greater the per-unit pressure has to be, which causes a proportionally greater force of friction and value of temperature flashes on basic contact surfaces, which can shorten the life of a brake disc.
3. Braking efficiency and fading
Braking efficiency is defined as an ability of achieving large retardation and short braking distance. Fading, in contrast, is the loss of braking force. It warns the driver that the brakes are hot and the vehicle has to be driven in a way ensuring their cooling. There are two types of fading: operational and critical. Operational fading is defined as a small drop of a vehicle’s braking efficiency caused by the heating of its brakes. After a momentary overheating and cooling, friction materials should regain their full friction coefficient value.
During sudden emergency braking from high speeds or long braking while going downhill on a steep slope, a sudden and large drop of the friction coefficient can occur, known as critical fading. It can even double braking distance of a vehicle and be a cause of an accident.
4. Quiet brakes
Constant development in the construction of vehicles has minimized traditional sources of noise in cars. As a result, more and more often people notice sources of noise, which until now had been ignored, like the noise from the braking system. Apart from the structure and design of the braking system and the brake disc as well as the technical condition of the whole vehicle, brake pads are perceived as the most common source of generating vibroacoustic processes. A change in the composition and certain features of a friction material has a significant impact on the comfort provided by the brake. A modification of a friction material can take the form of changing its geometry. A commonly used technology, bringing satisfactory results, is the chamfering of the friction material’s edge. Another method is the prevention of possible spread of vibration between various components of the braking system and its propagation to supporting components and the vehicle’s suspension. Either components can be stiffened or their dampening can be increased. According to this concept, manufacturers of friction materials make brakes with an additional vibration-damping component fixed to the back of the brake pad, the so-called shim, which has a multilayer structure.
5. Friction coefficient
The friction coefficient is the ratio of the friction force to the reactive force of a surface (surface of a brake disc or drum). Manufacturers strive for keeping a stable value of the friction coefficient in a broad range of temperature, speed and load applied. Friction materials with a large scatter (spread) of the maximum and minimum values of the friction coefficient are susceptible to generating vibroacustic processes (squeaks and vibration).