if you can find an import......
thing to remember with corollas is that ALL body shapes had all options.....
cept for ae92 wagons. ae101 and ae111 wagons however did have all options, as in 4age and 6 speed etc.
so getting back to the ae82..... yes the sedans had dics, they were the same as the hatchs brakes.
but really your best mod would be to change the fluid and fit some decent front pads, if thats not enough, fit better tyres and back sure your suspension works ok.
if you can lock uo ya wheels easy, then you don't need more braking power, you need more grip....
btw, my comments are based on a few different markets, i can't say if oz spec rollas had discs etc