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Q:

why my 2007 shake when i put on brakes on 2007 Saturn Ion

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when in high speed and i start to slow down the car shakes had a wheel alignment still shakes
(1) Answer
Possibly(most likely) due to warped brake rotors, nothing to do with alignment. If alignment was done properly then the steering/suspension components should be okay.