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Q:

When ever I brake the front starts to shake vioneltly. on 2004 GMC Sierra 1500

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It is starting to do it now when I drive slowly.
(2) Answers
(1) Comments
Replace brake rotors and pads. Then be sure wheels are properly TORQUED! Dont recommend machining rotors, not that expensive for new.
Machining just shaves off metal that aids in heat despersion. Maybe turn them one time!
I agree with wetry
If the wheel pulls to any one direction harder then chances are you have a siezed caliper on the out front brakes. The other common cause is badalignment, however with it happening while slowing/stopping iit's most likely brakes.