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"I was good," Howard said. "It didn't hurt me on the swing at all, I felt like I hit the ball a little bit below the barrel. It was one of those, 'Ooooh,' looks."
The NL East's top team won its fifth straight and bettered the NL Central-leading Brewers again.
"There's no break," Brewers manager Ron Roenicke said. "You don't look forward to facing any of their starters."
Cole Hamels tossed a complete game in Thursday's opener with Howard out because of a lingering heel injury. On Friday, Howard staked Halladay a three-run, first-inning lead with his 32nd homer of the season.
Halladay (17-5) struck out nine to reach 204 for the season and scattered four hits and a run over eight innings after the Brewers roughed him up in April.
"I felt like I could go to any pitch when I needed to," Halladay said. "That's big against good teams that I can throw any pitch when I want."
Milwaukee scored twice in the ninth before dropping its fourth straight. St. Louis is seven games behind Milwaukee with 18 to play after a 4-3 win in 10 innings over Atlanta. Philadelphia leads the Braves by 11 games.
Bastardo was pulled for closer Ryan Madson, who allowed a one-out RBI single to Yuniesky Betancourt and a sacrifice fly to Jonathan Lucroy to make it 5-3 before converting his 29th save by getting George Kottaras to ground out.
The Phillies are having a blast in Milwaukee, and keep beating one of the only teams remotely close to them in the NL standings after completing a three-game sweep of Atlanta earlier this week.
"It's been a great run, jockeying for position for home field," Howard said. "But it's all for naught if you don't go out there and try to win and accomplish the ultimate team goal."
Before the game, four players took a ride down mascot Bernie Brewer's slide, then Pete Orr nearly ended up dead meat in the sixth-inning Sausage Race. Orr sprinted out of the dugout right into the path of the runners and clipped the Hot Dog just enough to send it stumbling. Orr laughed at the close call running out to his position at second.
"I was about to walk right in front of them," Halladay said. "I saw them coming. I stopped. Pete didn't."
Joked manager Charlie Manuel: "[Pete] was counting his batting average, ran in the way."
The Phillies were again without shortstop Jimmy Rollins (groin) and second baseman Chase Utley (head), but got to Shaun Marcum (12-6) in the first. Shane Victorino singled and reached third on Hunter Pence's broken-bat single.
Howard turned on a pitch down the middle after turning hard on the left leg, but his ball had plenty of distance, easily reaching the first row of the second deck in right field to give him an NL-leading 108 RBI this season.
"It's good to be able to get out in front, and that's for anybody, but when you have a guy like Doc on the mound, being able to give him that little bit of an edge and giving him something to work with, I don't want to say it makes things easier, but it does," Howard said.
The Phillies made it 5-0 in the seventh on Raul Ibanez's single that chased Marcum and Carlos Ruiz's single off reliever Takashi Saito. Betancourt's sacrifice fly cut in the seventh gave Milwaukee its only run off Halladay even though it appeared on replay that McGehee never touched home plate.
The Brewers scored six runs off Halladay in a 9-0 win on April 19, but couldn't find similar success against the NL's reigning Cy Young winner in losing for the seventh time in their last 11 games.
Milwaukee squandered its best chance for a big inning in the fourth. The Brewers loaded the bases with one out, but Betancourt swung at the first pitch and grounded into a double play to end the threat.
"We had the bases loaded there with one out," Roenicke said. "That was our shot."
- Halladay reached the 200-strikeout mark for the fifth time in his career in the sixth inning when Ryan Braun looked at a third strike.
- Betancourt is hitting .163 in his last 14 games.
- Philadelphia has won all seven of its previous four-game series with a combined record of 24-4.
- The Phillies improved their majors-best road record to 44-26.
- Milwaukee has five runs over this four-game skid.
- In Saturday night's game, Brewers LHP Randy Wolf (12-9, 3.47 ERA) will face LHP Cliff Lee (16-7, 2.47).