New Brake Pads Vibrating

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  #1  
Old 02-19-07, 03:47 PM
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New Brake Pads Vibrating

98 Nissan Altima 2.4 5 speed 143,000

Replaced front brake pads Saturday, rotors were replaced last brake job at around 100K. Brakes worked great. Stopped smoothly with no noise whatsoever; drove around town all day just to be sure. My wife takes the car on a 150 mile drive (All insterstate, minimal braking) and now on her return trip she says she feels a vibration through the steeing wheel and the florrboards and a corresponding noise when she steps on the brakes. What could have changed in 150 miles?

Thanks in advance....
 
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  #2  
Old 02-19-07, 06:30 PM
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The lug nuts were over-torqued when put back on and the rotors are now warped
 
  #3  
Old 02-19-07, 08:14 PM
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if you do not have resolve with the lug nut situation, a couple other things to look at:

rust/corrosion under the hardware on the caliper carrier
caliper sticky.
restricted brake hose

basically, if you do not find the lugnut situation caused the rotors to warp, I would look for anything that causes a drag on the rotor. What can happen if it is a slight drag is ,on short drives, you never notice a problem.

On long drives, the rotor heats up enough to warp.
 
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Old 02-20-07, 07:32 AM
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I'd also look for rust or deposits on the rotor/hub mating surfaces. This can cause the rotors to wobble.
 
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Old 02-21-07, 01:47 AM
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Can the rotors un-warp by backing off the lug nuts? Must the rotors now be replaced?

I'll also check for the other issues: kinked line, sticky caliper, etc, but the over- torque seems like it's right. The lug nuts were very loose when I took off the wheels. I may have over compensated when I put the lug nuts on again.

These are all things I never would have considered.

Thanks for lending me your experience.
 
  #6  
Old 02-21-07, 05:24 AM
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Originally Posted by allenzachary View Post
Can the rotors un-warp by backing off the lug nuts?
Not usually, no

Originally Posted by allenzachary View Post
Must the rotors now be replaced?
They may be able to be "turned", or shaved true, by a machinist (any place that does brakes should have the machine)

With 43K on them, they may be too thin to be "turned"
The tech should have the proper measuring device and specs

Or if you can measure the thickness yourself while the wheels are off during your inspection, the specs would be in a shop manual, or perhaps Autozone.com, or another online source might list them
 
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Old 02-21-07, 06:26 PM
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I also did experience that, I let my mechanic friend check my Jeep brake rotor - http://www.jpartsonline.com/jeepbrakerotor.html , and he found some rust on it. He said it was time for some replacement.
 

Last edited by Reign; 02-26-07 at 11:16 PM.
  #8  
Old 02-21-07, 07:16 PM
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If none of the other ideas work ther are a couple other things it could be. A tire out of balance can cause the same problem. You may not feel it very much until the brakes are applied which exagerates the problem. Were the pads you used a cheap semi metalic? I have an 03 Altima that had a set of those after one hard stop they had the same symptoms your having.
 
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