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Quick question about brake pads

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I'm just swaping out my rears and have various backing metals from previous pads.

 

I have the OEM backing which is thin metal and a fibre plate, I also have after-market plates which are just thicker metal.

 

My questions are these:

 

Why do the brake pads even need a backing plate, the pads rear face is pretty tough?

 

When using sintered pads the heat is conducted through the pad an into the calliper, so why did Suzuki decide to install a fibre plate - this will act as a thermal insulator and cause heat build up in the pad?

 

...and moving forward, which should I install with my new sintered pads (that didn't come with any backing plates)?

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The thermal plates are there to reduce heat transfer into the fluid, but yeah most after market does not come with such, so if oem has the heat insulator, Id use it if you can, even the oem backing plate may be better to use.

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I think its pretty normal to have to reuse the original backing plates. Some pads come with, but most don't seem to. Not that I've seen a lot....

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