dunnda

Can you tell me where is this located?

First My Brake Wear Light came on, so I replace my front brake pads with after market pads. Now when I apply the brakes I get a pulsation pump on the brake peddle, I have replace the front right brake sensor. Then I replace the front rotors with after market rotors. I am still getting that pulsation pump on the brakes when I apply them. Ther no ABS light on. Can anyone tell me what is the problem is, do I need to replace the brakes pads with lexus pads?