Has there ever been a 8–1 in the Brasileirão?

Yes, 3 times.

The first time: September 16, 1976, Flamengo beat Sampaio Corrêa (Flamengo 8–1 Sampaio Corrêa).

The last time: February 7, 1982, Guarani beat Ceará (Guarani 8–1 Ceará), 44 years ago.

Home wins: 3. Away wins: 0.

Nearby scores

1. 9–0 1 time
2. 9–1 Never
3. 9–2 1 time
4. 8–0 5 times
5. 8–1 3 times
6. 8–2 3 times
7. 7–0 10 times
8. 7–1 12 times
9. 7–2 3 times

All games

1. February 7, 1982 Guarani 8–1 Ceará
2. March 23, 1980 Vitória 8–1 América-RN
3. September 16, 1976 Flamengo 8–1 Sampaio Corrêa