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Q: pulsating when I brake on 2002 Nissan Maxima

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when I brake I feel a pulsating on the brake peddle. I check the brake pads and roters on the front they look fine. Put new brake pads on the back. What could this be?
(1) Answer
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When the brakes are applied to slow down the vehicle heat is produced. This heat may cause the brake rotors to warp or buckle. If the brake discs are warped even three or four one thousandths of an inch, the brake pedal may pulse and the vehicle may shake when the brakes are applied. If the brake discs are badly warped the whole vehicle may shake and cause the steering wheel to oscillate and shake from side to side under braking.To eliminate this unwanted vibration the brake rotors need to measured both for uniform thickness and “run out”. Run out is a measurement by rotating the brake disc and accurately measuring how much deflection the surface of the brake disc takes as the disc is rotated. The brake discs are brought back to uniform thickness and parallelism by machining the brake discs if there is sufficient material left to remove. If the brake pads have worn down to the point where they have damaged the brake discs the brake discs will need to be machined or replaced.