Johnson hit 12 of 14 from the free-throw line.
Michael Flowers had 12 points and seven assists for Western Michigan (13-17, 6-11 Mid-American Conference). Rafael Cruz Jr. added 10 points. B. Artis White had six rebounds.
Ty Groce had 11 points for the Eagles (16-14, 6-11). Darion Spottsville added 10 points as did Yeikson Montero.
The Broncos leveled the season series against the Eagles with the win. Eastern Michigan defeated Western Michigan 69-51 on Feb. 15.
Western Michigan finishes the regular season against Central Michigan on the road on Friday. Eastern Michigan finishes the regular season against Toledo on the road on Friday.
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