BB meaning: ball bearing, DB meaning: disc brake ?
Yes, there are bearing balls inside, that contact the ramp ring that is attached to the actuating arm
which, when rotated, becomes sideways motion, making the pressure of the pad against the disc...
# 5 & 7 use this type of mech.. 7 adds the knob adjuster for the moving pad
both have the same stationary pad wear adjustment...
too hard to find anything on those? , ready to question your attachment to keeping them?
...
Last edited by fietsbob; 07-06-20 at 10:04 PM.