Brooks became a starter at right defensive tackle in the 8th game of the season during his
rookie year of 1972. He collected 9
quarterback sacks in 1973 and the Rams defense was tops in the NFL against the run (allowing 1,270 rushing yards) and led the NFL in total defense (allowing just 2,970 yards). Brooks led Ram defensive linemen in tackles for the first time with 76. The 1973 Los Angeles Rams did not allow 300 yards in all 14 games in a 14-game season. in 2008 the Steelers' defense has held opponents to under 300 yards in all 14 games this season, tied for the longest streak to start a season since 1970. However, the Steelers did not break the Rams' record. In 1974, Brooks tackled opposing passers 11 times as the Rams were first in the NFC with 44 sacks and again led the NFL in allowing the fewest rushing yards with 1302 while allowing the fewest points, 181. That season Brooks was All-NFC as selected by
Pro Football Weekly, and Second-team All-Pro by
Newspaper Enterprise Association. For the second season in a row, Brooks led all Ram defensive linemen in tackles with 73, not including his 11 sacks, which trailed only
Jack Youngblood and
Fred Dryer, the team leaders. He recorded 5 sacks in 1975 before a knee injury shelved him for the second half of the season. The Rams clearly missed him during the
NFC Championship loss to
Dallas as they were suckered countless times by the Cowboys
shotgun in a 37–7 loss. The Rams defense was 2nd in the NFL in rushing defense missing out on leading the NFL for the third consecutive year by a single yard. The
Minnesota Vikings allowed 1532 rushing yards, while the Rams allowed 1533, allowing the Vikings to capture that title. Nonetheless, the Rams allowed the fewest points in the NFL for the second straight season with 135 (missing the NFL record by 3 points). Brooks rebounded in 1976, he was named to the Pro Bowl and was voted Second-team All-NFC by
United Press International. His 74 tackles again led Ram defensive linemen, with 13 of those going for a loss, to go along with his 14½ sacks which tied him for the team lead with
Jack Youngblood. The Rams led the NFC in rushing defense for the third time in the past four years. They were second only the Pittsburgh Steelers in the NFL in that category. In 1977, Brooks was named First-team All-Pro by the
Pro Football Writers Association and
The Sporting News and First-team All-NFC teams among several others. Rams allowed 146 points, 2nd best in the NFL. Brooks's 6½ sacks were 3rd on the team behind Jack Youngblood and
Fred Dryer. His 71 tackles (55 solo) led all Rams defensive linemen (again) and returned to the Pro Bowl (again). Was voted the Rams Outstanding Defensive Lineman by the Los Angeles Rams Alumni. In 1978, he was named Second-team All-Pro by the
Associated Press and Newspaper Enterprise Association and First-team All-NFC by United Press International and
Pro Football Weekly despite missing the last 2 games of the season plus the NFC championship game with a knee injury. He led Rams in sacks with 8 as Rams were second in the NFC in sacks and led the NFL in total defense for the second time in the last six years. Brooks again led Rams defensive linemen in tackles with 80 (60 of them solo). He was voted to his third Pro Bowl, but missed the game as teammate Cody Jones (who was the first alternate) replaced him. In 1979, he led the Rams defensive line in tackles with 99 (9 behind the line of scrimmage) and had 6 sacks and knocked down 4 passes as Rams defense led the NFC in sacks with 52. He was named First-team All-Pro by the Associated Press. He ended the season by playing in
Super Bowl XIV with an injured ankle as Rams lost to the world champion
Pittsburgh Steelers. He also received another post season honor, that of Second-team All-NFC by United Press International. In 1980, Brooks led the defensive line in tackles with 54. His tackle number was lower than previous years as Rams began a rotation system at tackle with Brooks, Cody Jones (33 tackles-4 sacks), and Mike Fanning (37 tackles-10 sacks), who were all healthy for the first time since 1978. The 1980 season was the first since 1969 that three Ram defensive tackles amassed more than 30 tackles each. In addition to having 8½ sacks (as the Rams defense led the NFC with 56 sacks) Brooks was named to his fifth straight Pro Bowl was Second-team All-NFC by United Press International. That marked the sixth season in seven that Brooks attained post-season honors, in being either All-Pro, All-NFC, or a Pro Bowl selection. It also marked the seventh season in the last eight that Brooks led the Rams defensive linemen in tackles. The 1981, season was marred by injury as Brooks injured a knee at mid-season. The knee seemingly never fully recovered and Brooks played only two games at the end of the 1982 season. ==Coaching career==