I just replaced the front pads and rotors on my 850 and very soon after the rotors warped creating a shimmy in steering wheel when braking. The rotors are  made by Brembro (good quality) and I exchanged them for a new set. The new ones were fine for about 1000 miles, now the problem is back. I know they  were installed correctly, as were the brake pads. Anyone have this problem? I'm thinking of trying OEM rotors, since they were on there originally and I never had a brake problem with them. Please help!

 Thanks,
 Tom '96 850 91k

 Assuming correct torque you should not have a problem unless you are not breaking in the rotors. For at least 500 miles there should be no fast stops. Slow down very slow. The rotors need to be tempered and heat cycled before they should be pushed hard. BTW Brembo is OEM.
 

 Thanks Charles. I do torque the lug nuts correctly and did break the rotors in correctly (especially the 2nd set, by gliding to stops). I'm wondering if one of
 the calipers is hanging up causing the pads to drag and heat one rotor. The car does not pull any differently though so I'm still stumped. Thanks for saving
 me the expense of going to the OEMs (same thing).

 Tom

 A friend James Wong (lurks n re-surfaces on the board every now n then!) has the exact same problem ("james, you there?"). just had his brembo std size
 rotors 280mm fitted on his 96 855 wagon T5 some 2 mths back. within coupla weeks he started experiencing brake judder. now, after a recent particularly
 hard ride, he freely admits the rotors are warped as hell. Seems to be getting a bit common on our turbo bricks, whenever one fits non-OEM rotors, there's a 50/50 risk of getting warpage ...

 jeff
 95 855T5A, SAM chip, IPD bars, full S/sprint exos, Bilsteins

 Arew they cross-drilled? For a while, IPD's web page said the  cross-drilled Brembo rotors have warpage problems for "street  use" and they recommend the slotted version. I just checked and they don't even show the cross-drilled versions any more.
 --
 Ray Niblett 95 855 GLT / 98 S70 T5M

 Does the shimmy start from the first moment you try to brake or does it take a while to happen i.e. after 10 -15 minutes of stop and go traffic ? I had the
 same problem with our '95 855T on the rear. The problem was the caliper sticking ever so slightly. After some time the brake pad would heat up and warp. I
 replaced the caliper and no further problem. The left rear went at 48K and the right rear at 70K. The cost to repalce as about $200.00
 --
 JFarns

 I think I might have the same problem. I'll check to see if one of the rotors gets much hotter than the other, indicating a sticking problem.
 Thanks for the advice.

 Tom

 These are just the plain vented rotors. I think the problem is one of the calipers is sticking.

 Thanks,
 Tom