If it sat for a couple of weeks as you say and it’s a humid climate it could have been ‘flash rust’. This is rust that occurs on brake rotors sometimes after it rains or in high humid conditions, normally it doesn’t cause a problem if the vehicle doesn’t sit for too long but if it sits for a long period like this the rotor will get rusty everywhere except where the brake pads are causing a ‘clean spot’ which when the brakes are applied will translate into a brake pulsation. BTW this happens a LOT with cheep brake rotors.
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- 2003 Mitsubishi Montero Brake Pulsation/Shudder