I assume that by pedal brakes, you mean a coaster brake for the rear wheel. These were quite common at one time (and in america) but are far less common these days. I believe that Sturmey Archer may still make such a unit.
To fit such a unit you will need a coaster hub and then get a wheel made up.
I do not know if the bike frame you have will have the correct dimensions to take a coaster brake. Where you live, coaster brakes may be common and perhaps they are readily available as replacement parts.
Why are the current brakes all messed up? Why not fix them?
