Check the flex lines between the frame and the caliper. If the left side flex line is collapsing internally on hard braking, it will delay the application of the brake and give you a pull or a lockup on the right. The lines are made up of several layers of rubber and fabric, and problems might not be obvious from the outside.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!