After changing my VX's brake pads the first week of July, last Friday I heard a loud "click or clack" sound from my front brake caliper whenever I used the brakes....I limped her over to my mechanic/buddy's shop and borrowed his jack to pull the wheel off and check it out....one (out of the two)
caliper mounting bolts was missing! I checked them all the way around (4 total front plus 4 total rear) and found the remaining ones not quite tight as they apparently loosened-up over time.

I advise everyone to check the condition of the lock-washers anytime you remove the upper & lower caliper mounting bolts during maintenance & recommend installing new lock washers if in doubt about their condition.

I actually wound up installing new bolts & washers up front since I actually lost the one bolt. I plan on replacing the rear lock washers shortly.

The front bolts are larger than the rears so part #'s will be different for front & rear bolts & washers!

P.S.-----I am not referring to the caliper sliders (combo bolt & slider) but the actual caliper mounting bolts that fall directly behind the hub on the front where you have a top and bottom bolt.