Also make sure your pads are adjusted properly. Hombres use pads with threaded posts (I'd love to get my hands around the neck of whoever designed the 990 with smooth posts), so all you gotta do to line 'em up nice and tight against the rim is loosen the nut just a little so the pad moves around (but isn't flopping around) and then gently squeeze the brake. You can get in there with your fingers and wiggle the pad around until it buts up real even against the rim. Tighten the nut back down, locking the pad in place and being careful the pad doesn't walk away while you're tightening (otherwise guess what? You gotta start over!). Repeat on the other side.

Brand new super sticky Kool Stops won't stop for sh*t unless they're properly adjusted and unless your old pads are worn down to a shiny glaze you probably can revive them. Start with the pad contacting the rim as close to flat as possible, if your brakes start squealing when you squeeze then VERY SLIGHTLY 'toe' the pads inward at the *forward* section of the pad. This can require some trial and error, but tell yourself at least you're not working on 990s in a Quamen rear triangle with no clearance for the 4.6 hands you'll need to complete the task.