I had that real drawn out stopping distance once & it was a partly crimped front line (before the splitter so both fronts affected) on the stock car but people have reported that too large of MC bore dia will give an inodinately hard pedal to the point of literally having their a$$ up in the air stomping on the pedal to generate any force but that ain't been my exp with the 1&1/8 MC I used on my 65 dart (& I ain't that strong). what Bore is yours? I gotta lean toward a partial blockage of some sort & I would go ahead & isolate the halves again for a start