Brake Pads and Rotors
Honda Civic LX
Why does my 98 Honda Civic LX make a knocking sound when I brake The brakes were just replaced and it didn't stop the noise?
I assume that you have rear drum brake. If so, the knocking
sound which happens only when apply the brake is more likely cause
by an out-of-round drum. Take your car back to the mechanic that
installed them. This problem is not bound to go away.