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most likely a warped rotor, check front end components (tie rod ends, ball joints). if a caliper is sticking the rotor will get very hot, get black, or discolor, and bend (warp). drive around for10 min. and jab the brakes hard several times during the drive. stop and feel the temp (don't touch) of each wheel with your hand. they should be equally warm. hot or smoking is not a good caliper.
No, airflow does not cause your car to 'SHIMMY', misaligned wheels, out of balance tires, or malfunctioning brakes will do that. Shimmering is an optical effect which can be caused by heat waves or dust particles, and is highly unlikely to occur during braking.
The front rotors are warped, the reason you feel it when lightly braking is because the pads are just brushing the high spots as they come by. Heaving braking will lock them in tighter and you will not notice it. They have to take the rotors off to turn them so they can check the wheel bearings at the same time and replace or pack them. Just have the rotors turned if they are not worn under the federal limits. If they are worn too bad you will have to replace them.
Im just askn...Does your steering wheel also shake? I,d start small look for any thrown wheel weights, wheel bearings, I would like the front end up so that the wheel are off the ground, rock the tire top backn forth and the same from side to side. Check you wheel balance. Another thing to check would be your sway bar bushings..I know nothing about your rig so im guessing!
A slight shimmy under braking is usually the result of a brake rotor that is not true. Sounds like you may have a warpped brake rotor...I would check that, and your front suspension componets for wear.... I hope this helps.
1. out of balance tire because it sounds speed spacific.
2. worst of all! Loose lug nuts or possibly loose spindle nut. (you will need to lift the wheel off the ground to tell)
3. worn linkages i.e. ball joints, steering linkage, anything that would allow play in the front wheels.
maybe the rotors are bigenuff and heat up too quick and warp but thats what they put on the car so youre out of luck,,,,you could put aftermarket rotors on it that are slotted and or crossdrilled which would greatly reduce the heat and your warping isue,,,,or maybe youre just too hard on the brakes,,try avoid sudden stops and braking at the last minute
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