Largely depends on the exact caliper of use. How much pressure it sees and how they are used.
First; all calipers flex. Aluminum more than iron. Smaller ones more than larger ones. And many "tests" conducted make no mention of the pressure being put into them. If a caliper flexes horribly at 1500psi (OMG! LOOK AT THAT!!) well...let me tell you that you'd be in one of the biggest slides of your life putting down some serious skid marks! lol
Most systems operate at a 500-800psi range and under harder use perhaps 1000psi. What happens above the point of wheel lock up is really rather moot.
Now combine both the wrong caliper (think body class size) with the wrong pad (think street pad with little bite) used on the track and wrong piston sizing (think too small) thus requiring yet more line pressure to make them clamp...yup, you have issues.
Using the proper class caliper with the proper pads in the right application caliper flex is hardly an issue on Wilwood or many other brands to concern yourself with. Today's Wilwood Aero series and Billet Suprlite parts all come with internal cross overs- a design that would not hold up under use and create body leaks if it were all so true.
Not saying this cannot be an issue, only that such testing needs more evaluation before you can toss a blanket over the cause. Running 3lb billet dyanite cotte pin calipers on a 3500lb car...then blame the part? Dune buggy parts on your open track day car you purchased for $100ea because they were on sale at Summit? Those things are not parts problems they are application problem. There's a reason why the "right" kits/parts for you car from Wilwood cost $1600-2000. Cheap out on non Wilwood kits (anyone can sell their calipers) and you get what you pay for.
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