Calipers size

[AcyTom]

Hello!

I have on my bug 1303 disc all around. In front standard bug calipers (40 mm) disc 278 mm.
On rear I have golf 3 calipers (38 mm) disc cc. 220 mm. The bug brake OK but with big weight I must bush pedal a lot.
I thin that I do not get from rear all power because the front is blocked to fast. So I would like to put some better break in front. My idea is to put disc from corado G60, ventilated disc 280 mm. And calipers from polo or something size 48 mm.
Will be 48 mm calipers to much for front of my bug? My tires are 185/65/15.
Or it is better to put some 42 mm calipers?

Thanks a lot!

Tomica