Vasco lies a point behind leader Atletico Mineiro after the draw.
Gremio saw its title hopes hit with a 2-1 defeat away to Coritiba.
Ayrton gave Coritiba the lead after 61 minutes but
Leonardo scored a late winner to secure all three points for Coritiba.
Botafogo beat bottom side Figueirense 1-0 in a match which saw both teams finish with 10 men.
Andrezinho got the only goal on the hour before Botafogo had
The Brazilian football federation says striker Michael has been dropped from the Under-20 national team for testing positive for cocaine after a match last month.