Brentford did a good job of keeping City out of danger in the first half and almost entered the break in a good position, but he conceded a penalty kick in the 40th minute, scored by Riyad Mahrez, to put the defending champions ahead.
City also had no problem after the break and decided the match in the 68th minute after Kevin De Bruyne scored, taking advantage of a Brentford goalkeeper’s mistake.
City extended its unbeaten record to 14 league games to expand the gap further with the second Liverpool, who will face Leicester City on Thursday. City played 24 matches against 22 for Liverpool.
And Brentford’s suffering continued after it suffered a fifth consecutive defeat in the league, to come closer to the relegation zone. The team is 14th, six points ahead of Norwich City, 18th, and Brentford has played a game more than it.