Дисертації з теми "Brake Wear"
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MacCrimmon, Donald. "Automotive brake wear debris analysis /." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1791982261&sid=5&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерелаMacCrimmon, Donald Cody. "Automotive Brake Wear Debris Analysis." OpenSIUC, 2009. https://opensiuc.lib.siu.edu/theses/486.
Повний текст джерелаRen, Haichuan [Verfasser]. "Investigations on Wear of Brake Pads / Haichuan Ren." Aachen : Shaker, 2016. http://d-nb.info/1084536676/34.
Повний текст джерелаStenberg, Forsberg Niklas, Joakim Tänndal, and Joakim Lange. "Wear particle collector concept for a train disc brake." Thesis, KTH, Maskinkonstruktion (Inst.), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-51372.
Повний текст джерелаIn a train disc brake, the frictional contact will generate wear particles in different size ranges. Depending on the aerodynamic diameter some of the particles become airborne; these are considered to be harmful to the human respiratory system. It is therefore beneficial to collect the airborne particles to improve the air quality.Different methods of gathering airborne particles were evaluated and the most suitable was selected. A conceptual solution in how to apply this on a Regina train bogie was then formulated and designed.The result is a particle collector that purifies the air using filters with sufficient efficiency for the application. A central collection unit is fitted on the bogie, connected by tubes to intakes mounted at the brake pads. The system utilizes airflow created by a fan to transport the particles through the tubing and filters.
Salama, M. R. El-M. "Investigation into the effect of fibre size on the tribological behaviour of semi-metallic brake material." Thesis, University of Salford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384145.
Повний текст джерелаYuen, Dick Kwan Kenneth. "Brake disc life prediction for material evaluation and selection : the application of finite element and fatigue analysis to the prediction of crack initiation in brake discs during operation." Thesis, University of Bradford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363977.
Повний текст джерелаMirzababaei, Saereh. "IMPACT OF HUMIDITY ON WEAR AND CREEP GROAN OF AUTOMOTIVE BRAKE FRICTION MATERIALS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2056.
Повний текст джерелаVerma, Piyush Chandra. "Automotive Brake Materials: Characterization of Wear Products and Relevant Mechanisms at High Temperature." Doctoral thesis, Università degli studi di Trento, 2016. https://hdl.handle.net/11572/369200.
Повний текст джерелаAbbasi, Saeed. "Towards elimination of airborne particles from rail traffic." Doctoral thesis, KTH, Maskinelement, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-131372.
Повний текст джерелаQC 20131025
Sjöholm, Mikael. "Benefits of regenerative braking and eco driving for high-speed trains : Energy consumption and brake wear." Thesis, KTH, Spårfordon, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31701.
Повний текст джерелаLoizou, Andreas. "Modelling and simulation of themo-mechanical phenomena at the friction interface of a disc brake.An empirically-based finite element model for the fundamental investigation of factors that influence the interface thermal resistance at the friction interface of a high energy sliding pair in a disc brake." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5489.
Повний текст джерелаInstitution of Mechanical Engineers (IMechE)
Loizou, Andreas. "Modelling and simulation of themo-mechanical phenomena at the friction interface of a disc brake : an empirically-based finite element model for the fundamental investigation of factors that influence the interface thermal resistance at the friction interface of a high energy sliding pair in a disc brake." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5489.
Повний текст джерелаRicciardi, Vincenzo [Verfasser], Stephan Akademischer Betreuer] Schmidt, Sebastian [Akademischer Betreuer] [Gramstat, and Klaus [Gutachter] Augsburg. "Advanced control functions of automotive brake systems for the optimisation of braking performance, brake wear and particle emissions / Vincenzo Ricciardi ; Gutachter: Klaus Augsburg ; Stephan Schmidt, Sebastian Gramstat." Ilmenau : TU Ilmenau, 2021. http://d-nb.info/1241963487/34.
Повний текст джерелаLee, Sangbok. "Effects of vibrations on friction and wear of automobile disc brake pads and electric motor carbon brushes /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.
Повний текст джерелаBarros, Liu Yesukai de. "Estudo da influência do cobre no desempenho tribológico de pastilhas de freio automotivo." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/179548.
Повний текст джерелаPrevious studies have shown that the copper originated from the wear of automotive brake friction materials is the main source of the deposit of this metal in rivers and lakes, leading to environmental impacts. As a result, recent legislations from international governmental agencies have forced a drastic reduction of the copper used in friction materials in next years, which is likely to be followed by other governments in the world. Although the copper is widely used in friction materials, the understanding of the action mechanisms of this metal in friction materials is quite limited. This work aims to contribute to a better understanding of the role of copper in automotive brake pads in terms of friction and wear. Tests were carried out in the tribometer of the Laboratory of Tribology of UFRGS, where three kinds of brake pads (with 0%, 10% and 30% of copper each) were subjected to different temperatures (100 ºC, 200 ºC e 300 ºC). Methodologies to evaluate friction, wear of brake pads, wear of discs, morphological parameters of contact plateaus and deposit of film on disc surface were used. The sample without copper presented higher friction than the samples with copper for the three temperature levels. The material with 10% of copper presented higher friction sensibility due the sliding speed than other samples. Strong inverse correlation between wear of brake pads and wear of discs was observed. Quantity of contact plateaus was the parameter that presented the higher correlation with the friction in different temperatures. An abrupted variation of friction was observed in some experiments for samples without copper and with 10% of copper. At the same time, it was observed a disturbance of the film deposited on the disc surface, where the film was removed when the sudden increase of the friction occurs. However, this phenomenon occurred only at 100 °C, indicating that the variation of friction and the disturbance of film occurs only at low temperatures, and seems to be regardless of percentage of copper.
Farwick, zum Hagen Ferdinand H. [Verfasser]. "Investigation of Brake Wear Particle Emissions on the Dynamometer and the Vehicle under Real-Driving Simulation / Ferdinand H. Farwick zum Hagen." Wuppertal : Universitätsbibliothek Wuppertal, 2020. http://d-nb.info/121438983X/34.
Повний текст джерелаVolta, Anna. "Ecotoxicological effects of Atmospheric particulate on aquatic And edaphic organisms." Doctoral thesis, Università del Piemonte Orientale, 2020. http://hdl.handle.net/11579/114794.
Повний текст джерелаRahimi, Mostafa. "Modeling and simulation of vehicle emissions for the reduction of road traffic pollution." Doctoral thesis, Università degli studi di Trento, 2023. https://hdl.handle.net/11572/365449.
Повний текст джерелаCeyte, Benoit. "Obrobitelnost litiny s lupínkovým grafitem pro brzdové díly firmy RENAULT." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229844.
Повний текст джерелаWahlström, Jens. "A study of airborne wear particles from automotive disc brakes." Doctoral thesis, KTH, Maskinelement, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31152.
Повний текст джерелаQC 20110317
Hutton, Toby. "The friction and wear of carbon-carbon composites for aircraft brakes." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760692.
Повний текст джерелаWahlström, Jens. "Towards a simulation methodology for predictionof airborne wear particles from disc brakes." Licentiate thesis, KTH, Machine Design (Div.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11044.
Повний текст джерелаDuring braking, both the rotor and the pads in disc brakes are worn. Since disc brakes are not sealed, some of the wear particles generated can become airborne. Several studies have found an association between adverse health effects and the concentration of particles in the atmosphere, so it is of interest to improve our knowledge of the airborne wear particles generated by disc brakes. However, in field tests it is difficult to distinguish these particles from others in the surrounding environment, so it may be preferable to use laboratory test stands and/or simulation models to study the amount of airborne wear particles generated.
This thesis deals with a simulation methodology for prediction of airborne wear particles from disc brakes and three experimental methods for testing disc brake materials with focus on airborne wear particles. The four appended papers discuss the possibility to both measure and predict the number and size distribution of airborne wear particles that originate from the pad to rotor contact. The objective is to develop a simulation methodology that predicts the number and size distribution of airborne wear particles from disc brakes.
Paper A describes how a modified pin-on-disc machine was used to study airborne wear particles originating from different disc brake materials. The results indicate that the test setup can be used to measure and rank the number concentration and size distribution of the airborne wear particles generated.
Paper B describes a disc brake assembly test stand for measurements of airborne wear particles from disc brakes. The results indicate that the test setup can be used to measure the number concentration and size distribution of airborne wear particles generated from disc brake materials. The results also indicate a promising ability to rank different pad/rotor material combinations with respect to the number concentration of airborne wear particles.
Paper C compares measurements made in passenger car field tests with measurements made in a disc brake assembly test stand and in a pin-on-disc machine. A promising correlation between the three different test methods is found.
Paper D presents a simulation methodology for predicting the number and size distribution of airborne wear particles using finite element analysis (FEA). The simulated number distribution is compared with experimental measurements at component level. The result indicates that the proposed methodology may be used to predict the number concentration and size distribution of airborne particles generated in the pad-to-rotor contact.
Wahlström, Jens. "Towards a simulation methodology for prediction of airborne wear particles from disc brakes /." Stockholm : KTH, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11044.
Повний текст джерелаWahlström, Jens. "Towards a simulation methodology for prediction of airborne wear particles from disc brakes." Licentiate thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11044.
Повний текст джерелаWang, Zhe. "Effects of anti-oxidant migration on friction and wear in carbon-carbon composite aircraft brakes /." Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1240703191&sid=6&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерела"Department of Mechanical Engineering and Energy Processes." Includes bibliographical references (leaves 77-81). Also available online.
Hayes, Daniel E. E. "The effects of porosity on the friction and wear of carbon-carbon composite aircraft brakes." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/34822.
Повний текст джерелаOrdine, Vieira Lopes Daniel [Verfasser]. "D-Brane Physics: From Weak to Strong Coupling / Daniel Ordine Vieira Lopes." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/104486883X/34.
Повний текст джерелаBaklouti, Mouna. "Analyse tribologique du rôle de constituants dans les performances de matériaux composites organiques pour garnitures de frein." Phd thesis, Ecole Centrale de Lille, 2013. http://tel.archives-ouvertes.fr/tel-00991953.
Повний текст джерелаPritzelwitz, Philip von. "Investigação do desgaste de freios e embreagens em prensas mecânicas." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-23082010-094644/.
Повний текст джерелаMechanical press clutches, especially clutches for hot forging presses have a hard working cycle with a little time between engagements. Many of those clutches present a severe lining wear, needing frequent maintenance stops. This work is discusse, the basics of eccentric presses and the clutch design parameters. Important points are: the balance between operation torque, engagements per minute and heat dissipation. This also presents a short literature review regarding composites and linings. It is discussed the design baselines differences between automotive linings and this specific case. It is presented a hypothesis about the heat transfer process in the clutch and how its related with wear, associating it with the contact pressure. In maintenance it is found different kinds of wear debris, suggesting more than one wear regime. The black debris indicates a severe wear regime. This debris can be associated to the lining polymeric matrix degradation. The polymeric matrix degradation is caused by the high op eration temperatures in these clutches. Based on simple pin-on-disc tests can be obtained results that show what is practical observed and the conditions this occurs, proving the hypothesis. Finally are presented suggestions for clutch dimensioning and necessary project cares.
Clark, Michael A. "Effect of nanoparticles on friction and wear of 2-D and 3-D carbon-carbon composite disc brakes /." Available to subscribers only, 2005. http://proquest.umi.com/pqdweb?did=1095432851&sid=8&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерела"Department of Mechanical Engineering and Energy Processes." Includes bibliographical references (leaves 84-86). Also available online.
Hentati, Nesrine. "Matériaux composites à matrice organique pour garnitures de frein : analyse des liens entre le procédé d’élaboration, la microstructure, les propriétés et le comportement tribologique : analyse des liens entre le procédé d’élaboration, la microstructure, les propriétés et le comportement tribologique." Thesis, Ecole centrale de Lille, 2014. http://www.theses.fr/2014ECLI0012/document.
Повний текст джерелаOrganic composite friction materials for brake lining result from a complex elaboration made up of successive stages (mixture of constituents, cold preforming, hot molding, post-curing) that makes difficult the mastery of the link between process, properties and behaviour of friction material, especially because of synergies between constituents on one hand, and between composition and manufacturing process on the other hand. Two manufacturing stages were involved in this study, the hot molding and the post-curing, with the aim of a better understanding of the influence of certain parameters of the manufacturing process: the temperature and the duration of hot molding, and the duration of post curing. The analysis has focused on the understanding the relationship between microstructure, properties, tribological behaviour and friction and wear mechanisms of materials.The experimental approach was based on the development of simplified formulations of friction material, and on an elementary wear test specifically designed for braking loadings
Kao, Pei-Chen, and 高珮禎. "Wear Analysis of Brake Pads for Roller Brake." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/9j63f5.
Повний текст джерела國立中興大學
機械工程學系所
106
Recently, the Public Bicycle System is using Roller Brake System to reduce the maintenance cost. The lifespan of the bicycle brake devices has been cut down because of the uneven wear. The main purpose of this thesis is to discuss the wear of brake pads for Roller Brake. Through experiments and Computer-Aided Engineering analysis to understand the wear distribution and the design model are improved to achieve uniform wear for brake pads. At the first of this study, aim to understand the braking range of Roller Brake and to confirm if it complies with EN specification, thus we do braking performance test. After that, used Computer-Aided Engineering software to complete the simulation model of Roller Brake, and analyzed the equivalent stress values of the coupled Thermal-Mechanical during braking, then have wear simulation procedure based on Archard’s wear law. Finally, compared the experiment of wear and the result of simulation, the improvement model would be proposed. From the experiment and analysis of this study, we could see the uneven wear of the brake pads. The improvement model changes the position of restraint of the brake pads and makes the structure symmetrical. By this design, the maximum stress value can be reduced by 9% to 46% compared with the original design, the stress distribution of the three brake pads is similar, and the stress values of the brake pads are evener than the original design.
Chen, Yen-Fu, and 陳彥甫. "Improve brake vibration that is caused by pad wear." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3pfq89.
Повний текст джерела國立臺北科技大學
車輛工程系所
101
Harsh driving behaviors or poor vehicle maintenance can easily cause un-uniform wear on the brake pad or disc and lead to vibration or noise problems of the brake system. This research focuses the brake vibration that is due to the pad wear. The study uses the commercial finite element code package, HyperWorks, to create the major components and sub-systems of a brake system, and to analyze and to predict the wear of the brake pad. The analysis results of this study are compared with the data of literature. They show good consistency with each other. Design improvement is made by choosing different heat treatment for the pad to enhance the surface toughness. The wear of the pad is reduced by 15.3%, and the vibration amplitude of the brake system is improved around 78%. It is a quick, easy and practical way to improve the brake vibration and pad wear problems for the vehicles which are on the market.
Tang, Jinghan, David Bryant, and Hong Sheng Qi. "A Finite Element Simulation of Disc Brake Hot Band Migration." 2015. http://hdl.handle.net/10454/8047.
Повний текст джерелаThe migration of hot banding is the phenomenon whereby hot bands or hot spots on the brake disc surface periodically migrate radially inward and outward. These migrations can cause the undesired brake torque variation (BTV) and further induce vibration problems such as brake judder. To investigate the forming and migration of hot banding problem, transient thermal mechanical finite element models of repetitive braking considering the effects of wear have been performed. The displacement, temperature, stress, and contact pressure distribution against time were obtained in this model. The thermal buckling, thermo-elastic instability (TEI) and hot band migration phenomena have been captured and investigated. The results suggest a cause-effect chain of radial hot band migration. Its determinants include mechanical loading, disc thermal buckling, and most importantly the transient interactions between TEI and wear.
Marques, José Pedro Santos Dias. "Caracterização físico-tribológica de materiais de travagem." Master's thesis, 2015. http://hdl.handle.net/10316/39091.
Повний текст джерелаA finalidade dos travões é desacelerar o veículo, através da transformação da energia cinética em calor, dissipando para o meio através do atrito. Os materiais de travagem fazem parte integrante de veículos pesados ou ligeiros e, têm, por isso, requisitos específicos, tais como: a resistência à corrosão, peso reduzido, longa vida, baixo ruído, atrito estável, baixa taxa de desgaste, e uma relação aceitável entre custo e desempenho. Existem dois tipos de sistemas de travagem – travões de tambor/calços e travões de disco/pastilhas. De modo a atingir o desempenho necessário, a maior parte dos materiais de atrito não são constituídos por um único elemento ou composto, antes são materiais compósitos. Mais de 2000 materiais diferentes e suas variantes são actualmente usados em componentes comerciais para pastilhas de travão. No que diz respeito à sua função, os materiais de travagem são classificados em quatro categorias principais: matriz, conhecido como material de ligação, fibras, modificadores de atrito e materiais de enchimento/reforço [1]. A matriz é o núcleo do compósito pois tem a função de aglomerar firmemente todos os ingredientes, de modo a que cada um desempenhe a sua função de material de atrito. As fibras, por sua vez, são adicionadas para uma maior resistência, enquanto os modificadores de atrito são usados para manipular a gama de coeficiente de atrito desejado. Os materiais de enchimento/reforço pretendem manter o coeficiente de atrito numa gama elevada de temperaturas, e também, reduzir custos. Os fabricantes de material de atrito reivindicam excelente resistência ao desgaste mas não dão garantias de uma determinada vida útil dos seus produtos, e, raramente publicam dados relativamente ao desgaste dos materiais por eles produzidos. Os ensaios à escala de material de travagem é muito demorado e muito custoso. Deste modo, existem inúmeros testes a escala reduzida que permitem a comparação, mais rápida, de diferentes formulações. Este tipo de equipamento não permite simular e obter resultados idênticos aos obtidos pelos materiais em serviço. Para além da complexidade dos materiais de atrito para travagem, a sua caracterização mecânica e tribológica também é difícil. A presente dissertação tem, como objectivo principal, a caracterização mecânica e tribológica de quatro materiais de desgaste de travagem - pastilhas - para veículos pesados, sendo estes o ACERCHINA, o ATV 55, o FRASLE FLE1749 e o JURID FF29. Para o efeito foi usado um equipamento a uma escala reduzida que permitiu variar os parâmetros que mais influenciam a travagem, e, controlar a temperatura e a força de atrito das pastilhas em estudo. Nos ensaios tribológicos foram usadas três velocidades de travagem e três forças normais. Como outputs foram obtidas as temperaturas das pastilhas e a força de atrito ao longo do ensaio. O desgaste de cada conjunto de pastilhas ensaiado foi determinado através de pesagem. A comparação do desempenho das formulações foi realizada através da representação gráfica de força e coeficiente de atrito ao longo da distância de escorregamento, bem como os volumes de desgaste de todas as condições e materiais. Por forma a complementar a caracterização tribológica, e para auxiliar a compreensão dos resultados, foram determinados os valores de dureza, densidade e o módulo de elasticidade para várias temperaturas. As amostras ensaiadas foram também observadas através de microscopia óptica e microscopia electrónica de varrimento. Genericamente, observou-se, para todos os materiais, que o volume de desgaste, para a mesma pressão, sofria um aumento quando a velocidade de escorregamento aumentava. O volume desgastado aumentava ainda mais quando se mantinha a velocidade e se aumentava a pressão. Em alguns materiais, mas apenas em algumas condições de ensaios, ocorreu uma diminuição abrupta da força de atrito e consequentemente diminuição da temperatura da pastilha. Outros materiais registaram um ruído agudo na maior parte dos ensaios. No que concerne às propriedades mecânicas, o módulo de elasticidade de todas as pastilhas diminuiu com o aumento da temperatura. Com o aumento da dureza das pastilhas verifica-se um aumento do desgaste específico [mg/MJ]. As formulações com melhor desempenho foram: o JURID no coeficiente de atrito, por registar valores mais elevados; o ATV na temperatura, por dissipar melhor a energia térmica; e o FRASLE no volume de desgaste, por ter valores mais reduzidos de desgaste volúmico e o único dentro dos valores de referência do desgaste específico.
The main purpose of brakes is to decelerate vehicles, by dissipating the kinetic energy into heat to the environment through friction. Braking materials are an integral part of heavy or light vehicles, and therefore have specific requirements, such as corrosion resistance, low weight, long life, low noise, stable friction, low wear rate, and an acceptable relation between cost and performance. There are two types of braking systems - brake drum/shoes and brake disc/pads. In order to achieve the required performance, most of the friction material are not constituted by a single element or compound, but by several components, they are composite materials. More than 2000 different variants of materials are currently used in commercial components for brake pads. With regard to its function, brake materials are classified into four major categories: matrix or binder material, fibers, friction modifiers, and fillers/reinforcements. Binder is the heart of a system which binds the ingredients firmly so that they can perform the desired function in the friction materials. Fibers in combination are added mainly for strength, while friction modifiers are used to manipulate the desired range of friction. Fillers/reinforcements are intended to maintain the friction coefficient in a high temperature range and also reduce costs. Friction material manufacturers claim excellent wear resistance but do not guarantee a certain life span of their products, and, rarely publish data regarding the wear of the materials they produce. Braking material test to scale are time consuming and very expensive. Thus, there are numerous small scale tests which allow a faster and inexpensive comparison between different formulations. This type of equipment cannot simulate and obtain results identical to those obtained for the materials in service. In addition to the complexity of brake friction material its tribological and mechanical characteristics is also problematic. The main objective of the present work is the mechanical and tribological characterization of four braking wear materials - pads - for heavy vehicles. Regarding this objective, a small scale tribometer was used to allow a parametric study on braking, and to control pads temperature and the friction force. In the tribological tests were used three sliding speeds and three normal forces. Pads temperature and friction force were the outputs of the tests. Wear volumes for each set of pads tested was determined by weighing. The performance comparison of formulations was done by plotting the friction force versus slip distance, and the evaluation of material removed by wear of all wear conditions and material formulation. In order to complement the tribological characteristics, and aid the understanding of the results, hardness values and density were determined. The elastic modulus was determined for various temperatures. The test samples were also observed in an optic microscope and a scanning electron microscope. Generally, all materials have an increase in wear volume, for the same normal pressure, when the sliding speed increases. A bigger amount of volume was worn when, at constant sliding speed, the normal pressure increased. Some materials, for determined test conditions, have a clear decrease of the friction force and consequently decreasing in pads temperature. Other materials squealed in most tests. For what mechanical properties concerns, the elastic modulus of all the pads decreased with increasing temperature. An increase in pads hardness presented an increase in specific wear [mg/MJ]. The formulations with best performances were: JURID in friction coefficient, for the higher achieved values; ATV in temperature, due to dissipate the thermal energy better than the other formulations; and FRASLE for volume wear, for being the one with the lowest values of volume worn during the tests and the only one to keep its values within the ideal in specific wear.