I'd be interested in upgrading all 4 brakes to bigger discs, but just
cannot afford it.

If fitting bigger discs, the caliper carriers would need altering also; if
the discs have a wider swept area larger calipers and pads would be
necessary.

Andrew

Andrew Grebneff
mollusc nut
84 VW Caravelle
Geology Department, University of Otago, PO Box 56 Dunedin, New Zealand
andrew.grebneff@stonebow.otago.ac.nz