Originally Posted by
azzzaoo6
'Sorry guys, I know there are too many of the same pictures, which is getting confusing. I've already adjusted the 2mm Allen key; it's very flimsy with an Allen wrench, and it only unscrews about 1 revolution. Is that normal? But still, the bike isn't stopping. its at about 50% The pads are clamping onto the rotor, no problem; I think it's contaminated. I'm thinking of buying new brakes from AliExpress, either identical or from another brand, or is that not possible?
the set screw only keeps the Adjuster in position, it will NOT adjust the brakes.
the adjustment is done via the 5mm allen hole on the inner side of the caliper, after you loosen the 2mm set screw... and that set screw should be able to un-thread completely from the caliper body, but that white corrosion (AKA: Aluminum rust) is preventing it from turning more than one rev.
lightly re-tighten the 2mm set screw After finishing your adjustment..
a better plan is to take the bike to a qualified mechanic now, and save yourself from causing irreversible damage.
i'm seeing way too much confusion from you about what is a basic tune up thing, and SAFETY related.