i also had a set of slotted dba's on my 99 fairlane with ultimate pads.
I went back to oem discs and the shudder and wobble was gone which i also fitted bosch pads.
1.I heard two stories:that heat builds up at the end of the slots causing hot spots.
2.ultimates need a lot of heat to work properly.
As mine is a daily driver the pads weren't getting hot where as i check my slotted discs they were worn by .010" on each side after 6 months.
So the new ones on now and i havent had a problem.
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