After taking pole position on Saturday, finished second and reclaimed the leadership of the 2019 title race.
Former points leader went off.
finished 16th after starting 24th.
In race two, , while Zonta and Barrichello were 11th and 12th, respectively.
“This is a track I did not know,” said Piquet. “We had a hard qualy, so it's a relief to get this podium, which is very good for the championship and for the mechanics. They worked hard and deserved a good result.
“I want to thank the team for all the effort and strategy we have adopted in both races. We still have work to do to reach the leaders' speed, but we are arriving and, every weekend, developing a little bit.
“Today I had a new helmet, more like my father's, and I think it was he who gave me luck.”
Ricardo Maurício and Julio Campos winners of Santa Cruz do Sul Stock Car Brasil
Mauricio’s win vaulted him to the second place of the standings, while Barrichello is now third in the championship.
“It was a fight day,” said Barichello. “We had an accident in race one and ended up changing our tire strategy. I had to hold onto the track to score a few points even with the degradation.
“In the last two stages, we have faced some problems, but we are going to keep our heads up, working to continue going forward.”
Stock Car Brazil point standings
1. Daniel Serra - 161
2. Ricardo Maurício - 140
3. Rubens Barrichello - 137
4. Julio Campos - 135
5. Thiago Camilo - 131
6. Max Wilson - 97
7. Felipe Fraga - 94
8. Marcos Gomes - 84
9. Galid Osman - 80
10. Cacá Bueno - 79