Do bmx bikes have peddle brake?

I'm sorta confused by what you mean by this, but it hasn't been answered yet so ill try and help.

I mean, all bikes can have breaks i think, im kind of thinking you are talking about fixed gears, (single speeds, fixies, etc) which are often seen with no breaks, or sometimes only a front break. the reason for this is that for a fixed gear a back break is redundant. fixed gear riders stop by stopping the forward motion of the bike by pushing backwards. this uses the law of motion that an object in motion must stop before changing direction. thus, by trying to make the bike go backwards, it will stop before it ever does.

because a fixed gear can do this, having a back break is just weird.

however, you can by all means put a back break on one. i have a motobecane messenger which is fixed/free wheel convertable and it came with a front and back break kit. i have mine fixed, and only the front break on which is all i need for riding around the city. my friend has the same bike and has it on free wheel so he can coast, and its still a road bike, and yes, he has both breaks on.

so short answer, yes they can.

free wheel road bikes, i recommend a back and front break

fixed gear bikes.. you don't really need a back break. i recommend having the front though for emergencies.

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This person is talking about backbreak bikes. These are breaks that are activated by peddling backwards on your bike. Most childhood bikes had these kinds of breaks. I think they're better than handbreaks because your legs are stronger and give you more breaking power. And, yes, some manufacturers do make backbreak bikes.