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The braking system is a crucial element in automotive safety. In order for the braking mechanism to function effectively, the brake pads' durability as well as quality are crucial aspects to take into account. A brake pad is a part of a vehicle that holds the wheel rotation so that braking can occur. Asbestos, which is harmful to human health, is a raw material that is recently being widely used as a material mixture for the manufacturing of brake pads. Many efforts have been made by researchers to find other natural alternative materials to replace the use of asbestos. Natural materials that have received much attention and research include coconut fiber, wood powder or flour, bamboo fiber, shell powder, etc. This review paper focuses on analyzing the main parameters that affect brake pad performance. The composition of filler and fiber types of reinforcement for polymer composites is discussed. Previous studies' information on the fabrication and testing of brake pads are also highlighted. Furthermore, the findings of this review can provide researchers and academicians with useful information and points to consider for further research.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8955337 | PMC |
http://dx.doi.org/10.3390/polym14061180 | DOI Listing |
PLoS One
September 2025
Department of Industrial Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia.
The increasing concern over environmental pollution from brake dust and the adverse impacts of conventional brake pad materials, such as metallic, semi-metallic, and ceramic composites, has prompted the exploration of more sustainable alternatives. Traditional brake pads release harmful non-exhaust emissions that contribute to air pollution and wear down quickly, posing both environmental and operational challenges. This study investigates the development and performance evaluation of polymer friction composites enhanced with natural friction modifiers sourced from agricultural waste materials like walnut shell, coconut shell, and groundnut shell powders.
View Article and Find Full Text PDFSci Rep
September 2025
Manufacturing and Production Engineering Dept, Modern Academy for Engineering and Technology, Cairo, Egypt.
This study evaluates the performance of three powder metallurgy-based brake pad formulations (BP1, BP2, and BP3) by examining mass loss, hardness, braking force, coefficient of friction (COF), noise, and vibration under 5 and 8 bar pressures. BP1 exhibited the highest braking force (640.99 N) and COF (0.
View Article and Find Full Text PDFJ Environ Sci (China)
December 2025
School of Vehicle and Mobility, Tsinghua University, Beijing 100084, China. Electronic address:
Brake wear particle (BWP) emissions are considered one of the dominant sources of particulate matter pollution in urban environments. BWP emissions have increased significantly under high-temperature conditions, emerging as a focal point of research interest. This study investigates the effect of brake temperatures on BWP emissions.
View Article and Find Full Text PDFSci Rep
August 2025
School of Mechanical Engineering, Dalian Jiaotong University, No. 794 Huanghe Road, Shahekou, 116028, Dalian, China.
The connecting rivets of the brake pads may undergo fatigue failure during braking, causing the friction plates to detach and thereby endangering the safety of train operation. This paper combines the interference matching riveting theory and the finite element analysis method to conduct a simulation analysis of the riveting process of the brake pads. Furthermore, considering the coupling effects such as residual compressive stress, temperature and mechanical stress during the forming of the rivets, a thermal-mechanical coupling analysis model for the brake pads of high-speed trains is established.
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July 2025
Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran.
This study investigated asbestos fiber concentrations and associated health risks in Shiraz over a period of one year and examined their relationship with various land use factors. Samples were analyzed using phase-contrast microscopy (PCM), and health effects were assessed using the EPA's IRIS method. We examined the relationship between asbestos fiber concentrations and road network density, population, number of bus stations, and green space.
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