Bad shaking only when braking
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New User
Joined: Aug 2005
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Bad shaking only when braking
I have a strange problem on my 99 f150 4x4. There is a bad shaking of the whole truck only when I brake. It gets worse the more I slow down. I have replaced tires all around, replaced front ball joints, cleaned and replaced rotors on front only and had it aligned. Nothing seemed to help. I had an auto parts store guy drive it and he said it feels like the ABS is trying to kick in early or whenever I am braking. Has anyone heard of this and what is next? If it is ABS, what is wrong? I have no warning lights for the ABS system on the dash. I am running out of options. The truck has 105000 miles on it.
Senior User
Joined: Mar 2003
Posts: 306
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From: Rancho Cucamonga, CA
I agree with Steve(ill)
Check your rear brakes, if they are warped it will cause your whole truck to shake even more than if the front rotors were warped.
If the front rotors were warped, your steering wheel would shake too.
Check your rear brakes, if they are warped it will cause your whole truck to shake even more than if the front rotors were warped.
If the front rotors were warped, your steering wheel would shake too.
New User
Joined: Aug 2005
Posts: 15
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I JUST picked up my truck last night, similar problem. To fix it, he turned the front rotors, cross-rotated the tires, re-balanaced them, and re-aligned everything. Car drives beautifully, no shakes, rattles, or rolls.
adam
adam
Cargo Master
Joined: Sep 2005
Posts: 2,958
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From: Montana
I had a rotor warp on my old '99 f-350 dually... think would shimmy and shake like a stripper. replaced the rear rotors and lathed the front.... no more cheap roller coasters! just be sure not to machine too much off the rotors... although they will still work just fine if you machine them a little more than the factory suggests, the ABS light WILL come on.ANNOYING!
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Posting Guru
Joined: Jul 2005
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From: peggs, oklahoma
your rotors are warped..my truck does it too..maybe from not changin the brake pads when they ened to be changed
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Junior User
Joined: Aug 2005
Posts: 78
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From: Northern MN
You want to be sure not to machine them too much under the minimum thickness. If you do the heat will warp them again. The minimum thickness should be cast or stamped on the rotor. I know a lot of cars now only have .010-.020 difference between new and min. thickness, so for all practical purposes you can't turn them. Don't know the numbers for trucks.
Junior User
Joined: Apr 2005
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Once rotors are warped caused by heat, turning them is a temporary solution. When the rotors are heated enough the crystal metal strucure gets modified and the metal gets a "set" in it which will still exist after the turn. Eventually, the warp will come back because of the internal stresses in the metal structure.
Typically, you should only turn a rotor to resurface it cause by uneven wear and grooving.
Typically, you should only turn a rotor to resurface it cause by uneven wear and grooving.
Posting Guru
Joined: Jul 2005
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From: peggs, oklahoma
Originally Posted by babock
Once rotors are warped caused by heat, turning them is a temporary solution. When the rotors are heated enough the crystal metal strucure gets modified and the metal gets a "set" in it which will still exist after the turn. Eventually, the warp will come back because of the internal stresses in the metal structure.
Typically, you should only turn a rotor to resurface it cause by uneven wear and grooving.
Typically, you should only turn a rotor to resurface it cause by uneven wear and grooving.
