What would be causing my brake pedal to pulsate when braking?

I just recently changed my front rotors, brake pads, and wheel bearings on my 96 Honda accord LX. I also replaced the rear drum shoes, wheel cylinder, and the drum on both sides. Ever since I replaced all that, at times I have to put a bit more effort on the brake pedal to stop. I bleed the brakes all around already so there's no air in the system. I also feel a little bit of vibration when driving on the highway and feel a little bit of pulsating on the brake pedal when pressing the pedal to stop. I'm thinking it's the front calipers that might be getting stuck but what someone else s opinion.

It is. So they are next to be replaced

Brakes don't cause any vibration when the brakes are not being applied so if you are feeling vibration when driving on the highway the problem is likely tire or wheel related. Cupped tires, bent wheel or out of balance.

Warped rotor could happen by unevenly or over tightening lugs. Use a torque wrench.

Replace the calipers and master cylinder.

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