The bleed screws on the wheel brake cylinders and calipers bleed the brake system.
Before starting, it is advisable to lubricate the bleed screw well with Multi-spray and leave it to act for a while, then take a suitable wrench and carefully unscrew the bleed screw. An open-end wrench can turn quickly, which is not recommended, the risk of damaging the screw angles is very high, use a special spanner for this purpose or an box-end wrench.
Use grease on the threads of the screw to prevent a false air supply during bleeding, so that you can clearly see if all the air has escaped from the brake system, do not overtighten the valve afterwards.
Add the rubber plugs, which protect the passage of dirt, they are not included (see the "Options" tab).
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