I have a full SRAM Rival groupset from 2011. Having used it in humid and rainy places for a while, most of the parts are OK, but the small button-head screws (or bolts?) in the QR pivot for the brake calipers are quite rusty. I guess the quality of these screws was somehow not up to the standard of the rest.
To be clear, I'm talking about a single screw per brake, whose head faces forward on the front brake, and backward on the rear brake.
Unfortunately, SRAM's maintenance guides do not call out these screws or dimension them in any way. How can they be replaced?