IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: motorhead on September 14 2011, 08:20:34 PM
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I am showing ~0.025-30" run out at the axle flange, which becomes ~0.050" at the outter edge of the rotor, which then translates into the undulating caliper that runs out ~0.035" (see video).
brakesbroke.mp4 (http://www.youtube.com/watch?v=ET9XBq-wynQ#ws)
I am willing to bet it has been like this since last March when I swapped the axle studs.
Me thinks I need a new axle. Should I figure to stop driving on this until I get a replacement?
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One more pic!
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I guess it is possible, but, not that probable. Could it be an axle bearing? I don't think driving on it will lead to sudden failure, but, it might wear the bearing out with time? Just guessing
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Eeyup,you need new axles.
Get a couple from Bear driveline.
Solid,not hollow.
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Well I smeared a little Sil-glyde on the caliper bracket and guide clips which killed the squeak.
I am pretty certain that it isn't the bearing because there is no "groan". I'll start shopping for a new/replacement piece(s).
In the meantime I am going to finish out the race season on it.
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Well I smeared a little Sil-glyde on the caliper bracket and guide clips which killed the squeak.
I am pretty certain that it isn't the bearing because there is no "groan". I'll start shopping for a new/replacement piece(s).
In the meantime I am going to finish out the race season on it.
That's not caused by a bearing [be sure to check it though],but you AREN'T finishing out the racing season on it,unless you're an idiot.:)
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So is the prevailing opinion that the axle is bent or could it be just the flange?
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My money is on the flange.
And yes, I am an idiot. But, in all seriousness I'll find a replacement.
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Only the outer face needs to be true and could be machined?
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Only the outer face needs to be true and could be machined?
Not a chance in Hell.
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My money is on the flange.
And yes, I am an idiot. But, in all seriousness I'll find a replacement.
Good thinking....an d not idiotic at all. :cool;
I would just buy a couple of upgraded axles and be done with it.
They shouldn't be much more than a replacement stocker and you'll be future proofing yourself.
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Definately a bent axle shaft.
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Take off the rotor and check the runout off the axle flange. Warped rotors can be deceiving.
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Only the outer face needs to be true and could be machined?
Not a chance in Hell.
Thanks for the detailed explanation
and welcome back Ed!
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Take off the rotor and check the runout off the axle flange. Warped rotors can be deceiving.
I thought I did that already? (first two photos) Also, I should point out that I did also measure around the outside of the flange and it showed ~0.015 of run out; just in case you were speaking to that.
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Doesn't the car wobble or shimmy at higher speeds, not during braking?
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Take off the rotor and check the runout off the axle flange. Warped rotors can be deceiving.
I thought I did that already? (first two photos) Also, I should point out that I did also measure around the outside of the flange and it showed ~0.015 of run out; just in case you were speaking to that.
I wasn't logged in so the photo's were not in your post. I see now. Forget my reply.
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Could it have anything to do with the rear disc conversion?
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Doesn't the car wobble or shimmy at higher speeds, not during braking?
Sure it has vibrations, but what car with this much rubber doesn't pick up NVH as compared to stock?
There is was/a notable squeak as the rotor walked the caliper assy in the caliper bracket, it goes away under light braking.
As for the conversion being the culprit - unlikely. As the other side is perfectly fine; unless of course you are suggesting I damaged something in the process - likely. ;)
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Doesn't the car wobble or shimmy at higher speeds, not during braking?
Sure it has vibrations, but what car with this much rubber doesn't pick up NVH as compared to stock?
There is was/a notable squeak as the rotor walked the caliper assy in the caliper bracket, it goes away under light braking.
As for the conversion being the culprit - unlikely. As the other side is perfectly fine; unless of course you are suggesting I damaged something in the process - likely. ;)
Nah - just wondering if it changed the geometry enough to allow something to bend/warp driving it the way you go.
Have you jumped any hybrids lately? Dukes Of Hazzard style?
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Doesn't the car wobble or shimmy at higher speeds, not during braking?
Sure it has vibrations, but what car with this much rubber doesn't pick up NVH as compared to stock?
Mine's as smooth as glass at 118.
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I'll say this for the car and vibrations... I couldn't feel a damn thing wrong at WOT in 3rd last night. The car was hauling ass in the cool Fall air.
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Only the outer face needs to be true and could be machined?
Not a chance in Hell.
Thanks for the detailed explanation
and welcome back Ed!
Eeyeah,my bad.
You can't bend an axle that much and not impart serious stresses to it.
On a regular passenger car,you might be able to straighten it and get it to last,but in the performance envelope Mike's using it in,I wouldn't chance it.
Remember that the axle bearing race is going to be tweaked too,so machining the face true isn't going to help that.
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FYI. Bear can't supply a stock replacement 28 spline axle.