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 Galant Brake Pedal Pulsation
Mitsubishi Galant Problem
Average Mileage: 51,500 mi (43,000 mi - 60,000 mi)
Visitor, 2004 Mitsubishi Galant, 60,000 mi
Braking causes steering column and car to shudder. Turned rotor and was smooth again but problem came back within 20k miles. After turning rotors twice I'm planning to replace rotors this time and hope it is permanent fix.