Dual brake lever pull on disc and V

i just got my new polo bike (NS bitch) set up with a deore mechanical disc brake i bought second hand. used it last night at the new indoor court and it worked perfectley! i even had to leave a lot of space for the pads as the disc was slightly bent.

Luca, what is the model number/name of this disc brake? I'm pretty set on getting an Avid BB7 as recommended above but interested to see your option.

Any recommendations on a disc guard, possibly for polo might have to get something custom made from the foundry down the road.