They're called brake bosses, and you use then as attachment points for a certain type of rim brake.
Yes, that is what the bleeder screw is for
No.
Bleeder screw for clutch is at the slave cylinder, on the bell housing of the Transmission. The bleeder for the brakes is on the calipers, and on the backing plate of the rear drum brakes
Next to the coolant reservoir... black hose sticking forward with a plastic screw in it...
vice-grips
Undo the Allen screw in the center and it should come right off.
To tighten the brakes on your vehicle, you will need to locate the brake adjustment nut or screw on the brake caliper. Use a wrench or screwdriver to turn the nut or screw clockwise to tighten the brakes. Be sure to test the brakes after adjusting to ensure they are working properly. If you are unsure or uncomfortable with this task, it is recommended to seek professional help from a mechanic.
To screw and unscrew things?
Yes, as long as you can access the bleeder screw.
A screw may be used to fasten things together, or to wedge things apart.
something is loose like a screw needs tightening get it fixed before it brakes
To properly adjust the bicycle brake adjustment screw for optimal braking performance, follow these steps: Locate the brake adjustment screw on the brake caliper. Turn the screw clockwise to tighten the brakes or counterclockwise to loosen them. Test the brakes by squeezing the brake lever to ensure they engage smoothly and effectively. Make small adjustments as needed until the brakes provide optimal stopping power without rubbing against the wheel. Remember to test the brakes in a safe environment before riding to ensure they are working correctly.