PROBLEM SOLVED in my case; Spyder is fixed and rolling again like new.
As mentioned just above, I had posted notice of a similar serious problem of Spyder pulling sharply to right under heavy braking in another thread several days ago. Severe enough to put me on shoulder of road instead of stopping in a safe, straight line while still on pavement. This has been resolved by replacing the left front calipers along with new pads. To 'equalize' braking ops, the right side pads were replaced with new as well, so that pad wear from this point is fresh and even. In recent weeks, the right side brakes were doing all the work. The OP here has same issue.
My techs tell me that it wasn't the pads or the rotors that were at fault. Simply, the left calipers were not functioning completely in balance with the right. Apparently, there is an on-line "chat" system where techs at BRP dealers can contact each other and compare issues. It seems there have now been a few cases where calipers have failed on one side or the other. Replacement of the weak side is the approved remedy. BRP covered my fix under warranty; I was lucky to still have two weeks of full coverage left before I go on B.E.S.T. Just as a heads-up, caliper replacement is worth $500 CAN (incl tax), roughly $350 US.
Both the head tech as well as myself have given my Spyder a good workout, post-repair, and agree the bike is solid and working fine again. I was in for my second service (oil change and check-over). The techs at H B Cycle in Lindsay, ON, did a fantastic job. Re-tensioned my belt, bled brake lines, looked everything including tires over real well. Feels and shifts like a brand new machine again. Wonderful to be back in the saddle knowing I have a safe, solid ryde under my butt again.
Hope OP's shop will resolve his issue as well. Get the bad calipers swapped out and replace the right side pads as well, just to be even and sure.
Cheers.
