{"id":539,"date":"2015-11-10T18:01:10","date_gmt":"2015-11-10T18:01:10","guid":{"rendered":"http:\/\/balconistasa.com\/?p=539"},"modified":"2015-11-10T18:01:10","modified_gmt":"2015-11-10T18:01:10","slug":"freio-a-disco-x-freio-a-tambor","status":"publish","type":"post","link":"https:\/\/balconistasa.com\/?p=539","title":{"rendered":"Freio a disco X freio a tambor"},"content":{"rendered":"

Os freios s\u00e3o partes fundamentais para o bom funcionamento de um ve\u00edculo. Na verdade, ele \u00e9 um item essencial para a seguran\u00e7a. Mas com o avan\u00e7o da tecnologia, ele tamb\u00e9m tem passado por uma s\u00e9rie de transforma\u00e7\u00f5es e hoje existem em variados tipos. Entre os principais modelos est\u00e3o os freios a tambor e os a disco, sem esquecer do ABS, cujo uso tem crescido muito.<\/p>\n

Nesta edi\u00e7\u00e3o, conhe\u00e7a algumas das principais diferen\u00e7as entre estes tipos de freio, saiba quais s\u00e3o as melhores recomenda\u00e7\u00f5es de uso e descubra algumas curiosidades sobre essa pe\u00e7a que todo mundo precisa tanto.<\/p>\n

\"shutterstock_53064031\"<\/a><\/p>\n

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Freio a tambor<\/h4>\n

– Gera a for\u00e7a de frenagem no interior do tambor de freio, por meio do atrito entre a lona e a superf\u00edcie do tambor.<\/p>\n

– Os tipos mais usados s\u00e3o Simples, para ve\u00edculos de passeio e em utilit\u00e1rios de pequeno porte, e o Duo-Servo, para ve\u00edculos de m\u00e9dio porte.<\/p>\n

– Possui duas sapatas, um cilindro de freio com pist\u00e3o e muitas molas. Essas molas s\u00e3o usadas para afastar a sapata do tambor quando o freio \u00e9 liberado.<\/p>\n

– Com o passar do tempo, ocorre o desgaste das lonas, o que aumenta a dist\u00e2ncia entre a sapata e o tambor. Essa diferen\u00e7a pode ser diminu\u00edda por meio de uma regulagem autom\u00e1tica que mant\u00e9m os dois sempre pr\u00f3ximos.<\/p>\n

– O freio a tambor precisa de menos reparos, geralmente a cada 50 mil quil\u00f4metros, mas seu custo pode ser maior. De acordo com a Fiat, por exemplo, a manuten\u00e7\u00e3o dos tambores, do jogo de sapatas e dos cilindros de freio de um Punto Essence sai por volta de R$ 571,66.
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Freio a disco<\/h4>\n

– Recebe a press\u00e3o hidr\u00e1ulica gerada pelo cilindro mestre e a transforma em for\u00e7a mec\u00e2nica atrav\u00e9s dos \u00eambolos. Essa for\u00e7a \u00e9 usada para pressionar as pastilhas de freio contra o disco.<\/p>\n

– Como ele fica muito mais exposto que o freio a tambor, sua refrigera\u00e7\u00e3o \u00e9 muito maior, principalmente quando o ve\u00edculo est\u00e1 em movimento.<\/p>\n

– Por ser mais simples, o freio a disco tem uma manuten\u00e7\u00e3o mais r\u00e1pida e barata. O que torna seu pre\u00e7o maior na hora da compra \u00e9 o pre\u00e7o da pr\u00f3pria fabrica\u00e7\u00e3o e do conjunto duplo de freios traseiros, que s\u00e3o montados com dois sistemas separados: um para o freio de estacionamento e o outro para os freios comuns.<\/p>\n

– Os freios a disco precisam passar por manuten\u00e7\u00e3o a cada 30 mil quil\u00f4metros, ou quando as pastilhas estiverem com uma espessura menor que 5 mm. Segundo a Fiat, o mesmo custo de manuten\u00e7\u00e3o, para o mesmo carro, seria de aproximadamente R$ 221,72.
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E o ABS?<\/h4>\n

– O ABS (Sistema Antibloqueio de Frenagem) surgiu em 1978, mas tem sido muito utilizado nos \u00faltimos anos. Ele permite que o carro obede\u00e7a a trajet\u00f3ria determinada pelo volante do ve\u00edculo e que o motorista desvie do obst\u00e1culo caso n\u00e3o haja espa\u00e7o suficiente para a frenagem completa.<\/p>\n

– Esse tipo de freio tamb\u00e9m \u00e9 capaz de reduzir a dist\u00e2ncia de parada do ve\u00edculo. Em asfalto molhado, por exemplo, ele diminui em 23%, desde que esteja a uma velocidade de 80 km\/h.<\/p>\n

– A partir de janeiro de 2014, todos os ve\u00edculos novos dever\u00e3o, obrigatoriamente, sair de f\u00e1brica com o sistema esse tipo de sistema de frenagem.<\/p>\n

– Apesar de extremamente necess\u00e1rias para a seguran\u00e7a de quem usa motos, a estimativa \u00e9 que apenas 1 em cada 100 motos fabricadas no mundo e 1 a cada 10 motos fabricadas na Euroap s\u00e3o equipadas com freios ABS.<\/p>\n

<\/h4>\n

Curiosidades:<\/strong><\/h4>\n

Para conseguir parar um carro, a pot\u00eancia de frenagem precisa ser pelo menos tr\u00eas vezes maior que a pot\u00eancia do motor. Em ve\u00edculos esportivos, essa rela\u00e7\u00e3o pode chegar a cinco vezes. Assim, se um carro tem 100 cv de pot\u00eancia, \u00e9 preciso ter cerca de 300 cv de pot\u00eancia dos freios.<\/p>\n

J\u00e1 num autom\u00f3vel para competi\u00e7\u00f5es a hist\u00f3ria de outra. Um carro da F\u00f3rmula 1, por exemplo, mais especificamente o Renault RS23, leva 2,9 segundos para chegar de 200 km\/h a 0. Se a velocidade for de 300 km\/h, a m\u00e1quina usada por Fernando Alonso e Jarno Trulli, conseguia parar completamente em 4 segundos. Para tamanho desempenho, tanto os freios quanto as pastilhas s\u00e3o feitas de carbono, que precisa enfrentar at\u00e9 1.000C na entrada de cada curva e cerca de 800 frenagens.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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