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Low brake fluid and the parking brake being on are the two most common causes.
Common causes of brake shudder include warped brake rotors, uneven brake pad wear, worn suspension components, and improper wheel alignment.
Bad brake switch. Typically located at the top of the brake pedal.
air coming out of the brake lines... that is if its a truck. if you aply the parking brake.
A faulty power brake vacuum booster could do that.
possibly a bad brake switch located on the brake pedal assy
A short in the Brake light circuit? Bad brake light switch?
Dust, unevenness.
friction
Hot spots are caused by over heating the rotors Causes: "riding" the brakes, faulty brake components, general abuse
I have a 03 gran prix and my brake lights doesn't come on when I go to brake
Low brake fluid possible