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Discussion Starter · #1 ·
This is a new car to me, 2008 xc70 and brakes were high on the list. The symptoms were vibrations at higher speeds, say above 80. In hindsight they were a bit inconsistent, sometimes mild, sometimes more severe... today I tackled the front brakes and surprisingly I found the caliber bracket bolts to be hand tightened at best. I was getting psyched to overcome the 200lb and found almost nothing. The brakes were serviced by a Volvo dealer 40 thousand km ago. Volvo disks and pads. Initially I got mad thinking that some dumbass forgot to tighten them properly but both sides seem a bit improbable. Not impossible just improbable.

I think the vibrations and the heat loosened the bolts. Even with the thread locker that comes standard with the Volvo bolts (genuine disks come with bracket bolts). So I would recommend checking these bolts. Not sure about hen v70 but the Xc has enough clearance to do this increase the ground.

Good luck.
 

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Did tightening the bracket bolts cure the high-speed vibration while braking? More often, this symptom indicates warpage of the rotor.
 

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Did tightening the bracket bolts cure the high-speed vibration while braking? More often, this symptom indicates warpage of the rotor.
Or hub run-out...

2002 V70XC, 2003 V40, 2004 S60, 2010 V70
 

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Discussion Starter · #4 ·
Did tightening the bracket bolts cure the high-speed vibration while braking? More often, this symptom indicates warpage of the rotor.
I only looked at the bolts because I was changing pads and disks. So I don't know if the vibrations would go away if you tighten those bolts. But it's definitely not safe to drive around like that.

And apparently warpage is a bit of a myth. Google cementite and decide for yourself.
 

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If you buy Volvo rotors, you get new bracket bolts, loctite-dipped.

I had braking shudder at > 60 mph on my 2004 XC70. While swapping in new front rotors, I took the old ones and laid them face-to-face. There was about 1/2 mm wobble (error in flatness), easily enough to explain the vibrations. New rotors (and pads) did the trick.
 
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