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Q:

i just replaced front and rear brakes but dont have much braking power on 1996 Pontiac Sunfire

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
rotors and drums were also replaced
(1) Answer
Did you just have them done,then drove it a few miles?

Some vehicles could take 20 to 50 miles(around town driving)
till the brakes seat to the new rotors and drums.