How should the anti-rattle/brake pad keeper fitting be correctly installed on front disc calipers? After removing, painting, and refitting the calipers on my '16XF Prestige, I've experienced a low speed occasional rattling from the front of the car. Brakes work fine. A trip to local dealer for other service resulted in my being informed I've installed the keeper/anti-rattle fitting incorrectly . So much for DIY effort.