Bundesliga leaders Bayern finished a awful week where they were knocked from the Champions League by Real Madrid having a unsatisfactory performance, the stalemate giving RB Leipzig the opportunity to cut the opening on top to six points by defeating Schalke on Sunday.
However, Mainz retook the lead five minutes before half-time as Brosinski converted from 12 yards.
The point leaves Mainz in 13th place, just a single point above the relegation place off position. Prior to that, it had been a poor performance from double-chasing Bayern ahead of Wednesday's German Cup semi-final at home to Borussia Dortmund.
"However, the most important thing is that we got a point and the fact that my first goal came against a great side like Bayern at a fantastic stadium like the Allianz Arena".
Bayern extended its advantage to nine points with four games remaining but Leipzig, which plays Schalke on Sunday, can still catch Carlo Ancelotti's defending champions.
Corbyn attacks May's plan for snap election despite Parly backing
It will also be the Brexit election, meant to consolidate the decision taken at the referendum and ensure there is no backsliding. However, Tuesday she said she had a "change of heart" in order to bring unity within the political corridors of Britain.
Bundesliga leaders Bayern Munich have now gone four games without a win after being held by struggling Mainz.
The hosts appeared to have a UEFA Champions League hangover when Mainz took the lead in the third minute through Bojan Krkic, his first goal since joining on loan from Stoke City.
Bayern's goalkeeper Manuel Neuer is sidelined with a foot fracture for the rest of the season and his replacement Sven Ulreich could not stop Daniel Brosinski's penalty on 41 minutes to put Mainz 2-1 up at the break.
Mainz were immediately punished as Bayern countered and Franck Ribery set up Robben to fire home left-footed.
"We didn't play well today".
Bruins Rally from Three Goals Down, But Lose in Overtime
A concussion has kept the Senators left wing out of the Ottawa line up sine October 2015 and many thought he'd never play again. The penalty on Nash drew the ire of the sellout TD Garden crowd of 17,565, as well as Bruins interim coach Bruce Cassidy.
To make things worse for Dortmund, Monchengladbach turned the tides after the restart as Marcel Schmelzer cleared the ball into the wrong goal with three minutes into the second half.
Wolfsburg are only one point above the play-off place after losing 1-0 to Hertha Berlin, BBC reports.
Elsewhere, Germany striker Max Kruse scored all four goals to cancel out Pascal Gross' penalty and Dario Lezcano's goal for relegation-threatened Ingolstadt in Werder Bremen's 4-2 away win to climb into the top six.
Eintracht Frankfurt ended their 10-game winless streak as Marco Fabian was on target twice to down Augsburg 3-1, and last-placed Darmstadt shocked Hamburg 2-1.
Babri Masjid Demolition Verdict: BJP Assures Support To Senior Leaders
Apolitical rally at Ram Janmabhoomi site in Ayodhya, Uttar Pradesh, turned violent and a large crowd demolished the Babri Masjid. Venkaiah Naidu were huddled for two hours at Modi's residence. "This [the Babri Masjid demolition] case is going on since 1993".