Not sure wether the back disc converstion would be worth it as
a, relativley little of the braking is done on the back wheels so theres not a great deal of point other than looks esp on a fairly small light car.
b, if you did put them on u wud need to ajust the brake bias as under heavy braking the back wheels will lock quite easily as the bias will be set up for realtivly poor drum brakes. so when the same bias is put through the back disc brakes they will lock. (it happened to a friend of mine who put discs on the back of his 106, as well as seeing it happen on a few other cars)
a, relativley little of the braking is done on the back wheels so theres not a great deal of point other than looks esp on a fairly small light car.
b, if you did put them on u wud need to ajust the brake bias as under heavy braking the back wheels will lock quite easily as the bias will be set up for realtivly poor drum brakes. so when the same bias is put through the back disc brakes they will lock. (it happened to a friend of mine who put discs on the back of his 106, as well as seeing it happen on a few other cars)