Pickup truck vibrates at high speed and when braking at any speed. Thoughts?
A month ago I noticed that my steering wheel vibrated when braking at high speeds. I had the rotors inspected and replaced, but then found that the steering wheel vibrated at high speeds when NOT braking. So, I had the wheels re-balanced. Now the whole truck vibrates at highway speeds and when braking at any speed (steering wheel does not vibrate). All of this is new. What did my mechanic screw up?
The vibration when braking is almost a rocking motion, as if the brakes are catching one part of the wheel, but not the entire wheel/rotor evenly. I wonder if the rotor is slightly crooked.
2006 Toyota Tacoma 4WD V6.
I'm not sure about Toyotas but on a 1991 BMW I have, there are bushings in the front suspension that when worn out cause vibration in the steering wheel at speeds of around 50 - 60 MPH. You would really notice it while braking. I replaced the bushings and the vibration went away while driving but still had some while braking. New brake rotors in the back and resurfacing the front rotors solved that problem.
Jack each wheel and perform a lateral and radial run-out at the wheel rim and edge of tire tread. Wheels can be out of round or wobble and/or tire can be out of round or lateral wobble from improper tread to casing application or tread separation?
Rotors can be true but, can have "Hot Spots". these are spots on the rotor where a portion of the rotor has overheated and a spot(s) are tempered. They do not wear as fast as the untempered metal in the rest of the rotor so . . . . the pads tend to catch on them giving a slight jerking when braking?
An other is when a wheel is torqued down out of sequence, (1,3,5,2,4 or 1,3,5,2,4,6) and/or the first nut is torqued too tight , the wheel can be slightly distorted resulting in a slightly lateral wobble.
Also - if the wheels are Alum alloy and the use of stick-on weights are necessary on the inside of the wheel - the weight application/training requires special attention.
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