Bad shaking on highway after pad/rotor replacement

[LeakySeals]

Last weekend replaced the rear rotors and pads to get rid of a vibration when braking. Thats gone, but now the truck shakes pretty bad at +-70mph. Like the tires are badly out of balance. Only had this problem after the rotor/pad swap so I'm wondering about the new rotors.

I purchased Raybestos advanced technology rotors with painted hats and louvres and matching pads off Amazon. When delivered the boxes had no packing and were destroyed to the point the UPS guy wanted to see what the rotors looked like upon opening. Seemed ok, no chips or anything. I put some anti seize on the hub and put everything back together. Smelled for a while during bedding process but nothing unusual. To the touch the temp was even on both sides. No pulling. no vibration when braking. But as I approach 70 its like uh oh did I forget to tighten the lugs?

What could be wrong?

 

[Trav]

Try this first, if it has aluminum wheels remove them and clean the back of them with a wire wheel in a drill. Many times they corrode/pit and don't sit properly if they are rotated on the hub.
Make sure to tighten the lugs crosswise and evenly.

 

[09_GXP]

Can you tell if the vibration is coming from one side or the other? If you can isolate it try switching tires from side to side and see how it feels.

 

[JC1]

Did you tighten all bolts and use a torque wrench to the proper spec?

Did you forget to torque the lug nuts?

 

[Bgallagher]

Originally Posted By: JC1
Did you tighten all bolts and use a torque wrench to the proper spec?

Did you forget to torque the lug nuts?


That is my thought as well. Try loosening and retighten in a criss cross fashion and torque to spec.

 

[LeakySeals]

Ok. Will pull 20" aluminum rims off, check everything, put it back together. I am way overdue for a rotate and balance. Didn't bother because the wear was even front to rear, no vibrations. I'm wondering if maybe a new rotor is exposing uneven tire wear. Also I put a coating of antiseize on the hub because of some rust. More than usual. Could that somehow make the rotor float or shift?

 

[LeakySeals]

Originally Posted By: Bgallagher
Originally Posted By: JC1
Did you tighten all bolts and use a torque wrench to the proper spec?

Did you forget to torque the lug nuts?


That is my thought as well. Try loosening and retighten in a criss cross fashion and torque to spec.


Never used a tourqe wrench for tightening wheels. I know its 140. Thats 2 "groans" on the star wrench

Haven't had issues in the past with these rims, but understand the importance of the spec and probably should get a wrench to be sure.

 

[Trav]

Originally Posted By: LeakySeals
Ok. Will pull 20" aluminum rims off, check everything, put it back together. I am way overdue for a rotate and balance. Didn't bother because the wear was even front to rear, no vibrations. I'm wondering if maybe a new rotor is exposing uneven tire wear. Also I put a coating of antiseize on the hub because of some rust. More than usual. Could that somehow make the rotor float or shift?


Did you clean the rust off the hub with a wire wheel? If not do that also. Wheel backs and hubs must be clean before applying anti seize.

 

[HerrStig]

Are the wheels hub cenntric or lug centric? Make sure there's no foreign material on the hub to inside of rotor interface.

 

[Johnny2Bad]

Your issue is tied to replacing the rotors, but is probably not caused by the rotors, instead it's probably caused by improper procedure. However, you could employ a runout gauge on the rotors (another part of "proper procedure") to be sure they are not part of the problem.

 

[DeepFriar]

You may have knocked a weight off one of the wheels. Look for a "clean" spot or adhesive with no weight attached.

 

[LeakySeals]

I used a wire brush prior to the anti seize. As far as install procedure, its pretty basic. But obviously something is awry. I'm overdue for a rotate and balance. Have a 4pm appt at a local Meineke. That will cover balancing and lack of proper torque. Will report back.

 

[SubLGT]

Measure the axial runout on the hubs. Generally, it needs to be less than 0.002". This is an important step most DIYers ignore.

 

[LeakySeals]

I had the tech at Meineke check my work and measure the rotor during the rotation and balance. He said rotor and pads were fine, but one of the rear tires was way out of balance, the other three off to some extent. I took it out on the highway, everything is good.

Weird how I only noticed the balancing issue after installing new rotors!!???