05 terios wheels and possible brake problem

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Hi everyone, my dad has recently just got a daihatsu terios (2005) sport with the standard 17 inch wheels, we'd like to fit some 15 or 16 inch wheels instead, has anyone done this and what and were do you get them?

Also my said it was pulling slightly while driving so pulled in, checked the front wheels and the passenger side front rim was very hot were as the driver side was cool, we got it back , my dad stripped the wheel off and messed with the caliper abit put the wheel back on and went for a drive, no problems from there... Weeks later after sitting no problem, then this weekend he said it started pulling again, we stopped and again the rim was real hot, got it back let it cool, knocked the handbrake off and it rolled forward no sticking etc. Ordered a new caliper but not sure what the problem is?

Thanks in advance
Mike