help please

Hi to all,
i was hoping someone could help, im having trouble in finding out which disc brake has been used on my a barracuda ghetto bike ive got.
Theres no make or model numbers on it.
As far as i know it is a standard make which was used at the time of when the bike was build and sold on.

has anyone got any ideas to were i can look to try and find out what make these brakes are so i can get some replacement pads