BRAKE VIBRATION

Hello,

A few months back, my 2005 CHEVROLET UPLANDER LT with around 65,000km had developed a very noticeable vibration when braking -- more noticeable when braking from highways speeds (over 100 km/h to even 40-50 km/h on city roads.

My mechanic replaced the front rotors with OEM ones from GM, and checked that the pads were fine.  We drove it and it seemed as though the vibration was not as noticeable, but still present.

A month or so later (@ around 70,000 km), the vibration was back to where it was originally.  My mechanic had a replacement OEM front set of rotors from GM sent again and it still does vibrates.

This is really annoying.


What could be the problem?
a) rotors still defective? -- hard to imagine if it happened two times after the rotors were replaced.
b) something with the pads?
c) are the calipers sticking/stuck somewhere??


** ANY OTHER IDEAS/SUGGESTIONS????


Thanks!

Get your self a decent set of slotted rotors, I have a feeling you do alot of hard braking. When you brake hard it causes the rotors to heat up and when they cool down they warp. Try this link:

Hi,
 
Maybe after the first set were replaced, I would think that warping was the issue (had that on a '98 Suburban... huge problem... replaced warp rotors like 4 times!) BUT the second set of rotors had vibration present just after they were installed!!!! It only got a little worse after a few thousand km.
 
I am located in Ontario, Canada, too... forgot to mention that!
 
Thanks for your advice.

I noticed where you were from kilometer man, us Americans use real measurements called MILES. It is possible your calipers are getting stuck, the vehicles so new that I wouldn't expect that to happen. The one thing you don't want to do is go replacing parts when you don't know what the problem is. I say get a whole aftermarket brake conversion kit if you want to, it will come with heavy duty slotted rotors, four piston calipers, and you probably wont have to replace them again for a while.

Thanks for you response.
 
If we didn't have this van on lease.. up in Sept., I would think that would be a good idea. 
 
I'll have my mechanic check it out again...
 
Thanks again.

Oh, its on lease.... Well that changes things!!!

Conversion kit sounds like a little overkill isn't it?
 
 
When they pull the brakes apart.....have them clean the built up rust from the hub with a chisel and grinder. And also lube the caliper pins so they are nice and free.

are slotted / cross drilled rotors the only answer...i don''t want to dump money into oem rotors (or any others) that will just warp again