Has there ever been a 8–2 in the Brasileirão?

Yes, 3 times.

The first time: December 28, 1960, Palmeiras beat Fortaleza (Palmeiras 8–2 Fortaleza).

The last time: December 5, 1993, Guarani beat Remo (Guarani 8–2 Remo), 32 years ago.

Home wins: 3. Away wins: 0.

Nearby scores

1. 9–1 Never
2. 9–2 1 time
3. 9–3 Never
4. 8–1 3 times
5. 8–2 3 times
6. 8–3 Never
7. 7–1 12 times
8. 7–2 3 times
9. 7–3 Never

All games

1. December 5, 1993 Guarani 8–2 Remo
2. October 2, 1986 Guarani 8–2 Piauí
3. December 28, 1960 Palmeiras 8–2 Fortaleza