The brake pedal may pulsate when the brakes are applied. This is most commonly caused by the front brake rotors warping. Resurfacing the affected rotors may correct the problem for the short term but replacement would generally considered a longer term solution.Google+
Car Problem Reports
Mitsubishi Eclipse Brake Pedal Pulsation
Mitsubishi Eclipse Problem
Average Mileage: 92,500 mi (15,000 mi - 141,000 mi)
Visitor, 2003 Mitsubishi Eclipse, 50,000 mi
72k miles and on 3rd brake replacement. This 53 yr old did not abuse brakes
Visitor, 2007 Mitsubishi Eclipse, 15,000 mi
breaks pulse when stopping on snow, ice or gravel. replaced rotors and pads numerous times but issue continues.
Visitor, 2003 Mitsubishi Eclipse, 139,000 mi
pulsating - rotors were rusting out, first time had to replace, granted it was all four.